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2016

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Articles 1 - 30 of 185

Full-Text Articles in Agricultural Science

Determinants Of Integrated Soil Fertility Management Technologies Adoption By Smallholder Farmers In The Chinyanja Triangle Of Southern Africa, Powell Mponela, Lulseged Tamene, Gift Ndengu, Ruth Magreta, Job Kihara, Nelson Mango Dec 2016

Determinants Of Integrated Soil Fertility Management Technologies Adoption By Smallholder Farmers In The Chinyanja Triangle Of Southern Africa, Powell Mponela, Lulseged Tamene, Gift Ndengu, Ruth Magreta, Job Kihara, Nelson Mango

All Peer-Reviewed Publications

Integrated Soil Fertility Management (ISFM) technologies have proven to be viable options for improving land productivity and increasing yield. However, adoption of the set of complementary technologies that are required in ISFM is quite variable and studies tend to focus on single technologies. In this study we used cluster analysis to group technologies and ordered probit to determine the probability of multiple technology adoption. The result show that usage of ISFM in the Chinyanja Triangle (Southern Africa) is grouped into 3 technological sets based on complementarities. The set of nutrient dense technologies of inorganic fertiliser, compost and animal manure (ISFMset3) …

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Aplikasi Pupuk Organik Cair Pada Tanaman Kentang Varietas Granola Di Dataran Medium, Hidayati Karamina, Wahyu Fikrinda Dec 2016

Aplikasi Pupuk Organik Cair Pada Tanaman Kentang Varietas Granola Di Dataran Medium, Hidayati Karamina, Wahyu Fikrinda

Jurnal Kultivasi

Kentang merupakan tanaman semusim dengan berbentuk menyemak dan memiliki sifat menjalar. Salah satu alternative upaya untuk meningkatkan hasil produktivitas kentang yaitu adalah penanaman kentang pada dataran medium. Tujuan dari penelitian ini adalah untuk menentukan jenis jenis dan takaran pupuk organik cair yang optimum dalam meningkatkan produksi kentang di dataran medium sehingga dari efektivitas itulah diharapkan pertumbuhan dan produktivitas kentang mampu optimal. Penelitian ini menggunakan Rancangan Acak Kelompok dengan 3 ulangan dengan 11 perlakuan. Hasil penelitian menunjukkan bahwa pupuk organik cair BIO-As dengan dosis 25 ml.l -1 mampu meningkatkan pertumbuhan tinggi tanaman, jumlah daun, jumlah batang, dan bobot total tanaman kentang. …

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Aplikasi Pupuk Organik Terhadap Hasil Kacang Hijau (Vigna Radiate L.) Di Ultisol, Ida Widiyawati, T. Harjoso, T. T. Taufik Dec 2016

Aplikasi Pupuk Organik Terhadap Hasil Kacang Hijau (Vigna Radiate L.) Di Ultisol, Ida Widiyawati, T. Harjoso, T. T. Taufik

Jurnal Kultivasi

Permasalahan budidaya kacang hijau di Indonesia adalah produktivitas yang masih rendah dan lahan budidaya yang terbatas, sehingga dapat diatasi dengan mengoptimalkan lahan marginal seperti tanah ultisol untuk kegiatan budidaya kacang hijau. Tujuan pene-litian ini adalah untuk mengetahui varietas kacang hijau dan jenis pupuk organik yang mampu menghasilkan produksi tinggi di tanah ultisol. Penelitian dilakukan menggunakan polibag di Screen House, Fakultas Pertanian, Universitas Jenderal Soedirman pada bulan Juli-September 2015. Penelitian menggunakan Rancangan Acak Kelompok Lengkap (RAKL) dengan dua faktor. Faktor pertama adalah varietas kacang hijau yang terdiri atas tiga varietas, yaitu Vima 1, Betet, dan Murai. Faktor kedua adalah jenis pupuk, …

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Aplikasi Sitokinin Untuk Pematahan Dormansi Benih Kentang G1 (Solanum Tuberosum L.), Anne Nuraini, Sumadi, R. Pratama Dec 2016

Aplikasi Sitokinin Untuk Pematahan Dormansi Benih Kentang G1 (Solanum Tuberosum L.), Anne Nuraini, Sumadi, R. Pratama

Jurnal Kultivasi

Kentang merupakan komoditas pertanian yang mempunyai arti penting di dunia. Kentang mempunyai berbagai macam keunggulan seperti sumber protein yang tinggi, tidak mudah rusak seperti sayuran lain, dan berpotensi dalam program diversivikasi pangan. Salah satu kendala dalam produksi kentang adalah adanya fase dormansi pada masa pertumbuhan kentang. Upaya mempercepat masa dormansi tanaman adalah dengan penambahan hormon pemacu pertumbuhan. Sitokinin merupakan salah satu hormon pemacu pertumbuhan yang berperan dalam pembelahan sel. Tujuan dilakukannya penelitian ini adalah untuk mengetahui pengaruh konsentrasi sitokinin terhadap dormansi benih kentang. Penelitian ini dilakukan di laboratorium Teknologi Benih Fakultas Pertanian Universitas Padjadjaran. Sitokinin yang digunakan pada penelitian ini …

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Pertumbuhan Eksplan Meristem Bawang Putih (Allium Sativum L.) Kultivar Tawangmangu Pada Berbagai Komposisi Kinetin Dan Ga3 In Vitro, Y. Sholihin, Erni Suminar, Wieny Heriliya Rizky, G. G. Pitaloka Dec 2016

Pertumbuhan Eksplan Meristem Bawang Putih (Allium Sativum L.) Kultivar Tawangmangu Pada Berbagai Komposisi Kinetin Dan Ga3 In Vitro, Y. Sholihin, Erni Suminar, Wieny Heriliya Rizky, G. G. Pitaloka

Jurnal Kultivasi

Bawang putih merupakan komoditas penting di Indonesia. Indonesia merupakan negara terbesar pengimpor bawang putih. Permasalahan yang dihadapi dalam teknik produksi benih secara konvensional menjadi salah satu faktor pembatas tidak optimalnya pengembangan dan penyebaran benih tersebut. Produksi benih in vitro dapat dijadikan sebagai metode alternatif dalam perbanyakan benih sumber kultivar unggul. Penelitian ini bertujuanuntuk mendapatkan komposisi kinetin dan GA3 terbaik pada media dasar MS untuk regenerasi eksplan meristemsecara in vitro.Penelitian dilaksanakan di Laboratorium Kultur JaringanBalai Pengembangan Benih Hortikultura dan Aneka Tanaman Pasir Banteng, Kecamatan Jatinangor, Kabupaten Sumedang, Provinsi Jawa Barat, yang berlangsung dari bulan April hingga Juli 2015. Eksplan yang digunakan …

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Rerspon Tanaman Hanjeli (Coix Lacryma-Jobi L.) Akibat Kombinasi Jarak Tanam Dengan Dosis Pupuk Organik Cair Di Kecamatan Rancakalong, Agus Wahyudin, Ruminta, Yuyun Yuwariah, M. Fauzi Dec 2016

Rerspon Tanaman Hanjeli (Coix Lacryma-Jobi L.) Akibat Kombinasi Jarak Tanam Dengan Dosis Pupuk Organik Cair Di Kecamatan Rancakalong, Agus Wahyudin, Ruminta, Yuyun Yuwariah, M. Fauzi

Jurnal Kultivasi

Pertambahan jumlah penduduk yang sangat besar menyebabkan kebutuhan pangan meningkat.Salah satu alternatif yang dapat dijadikan solusi adalah program diversifikasi pangan.Hanjeli adalah salah satu tanaman pangan alternatif, namun petani belum mendalami teknik budidaya tanaman ini terutama pemupukan.Oleh karena itu dilakukan suatu upaya untuk meningkatkan pertumbuhan dan hasil hanjeli dengan kombinasi jarak tanam dengan dosis pupuk organik cair.Penelitian ini bertujuan untuk memperoleh kombinasi jarak tanam dengan dosis pupuk organik cair untuk meningkatkan hasil tanaman hanjeli. Percobaan dilaksanakan di Desa Pasir Biru, Kecamatan Rancakalong, Kabupaten Sumedang pada bulan Desember 2015 sampai dengan Mei 2016. Bibit Hanjeli yang dipergunakan adalah Hanjeli Pulut aksesi 37.Rancangan …

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Pertumbuhan Dan Hasil Padi Gogo Hubungannya Dengan Kandungan Prolin Dan 2-Acetyl-1-Pyrroline Pada Kondisi Kadar Air Tanah Berbeda, A. Y. Rahayu, T. A.D. Haryanto, S. N. Iftitah Dec 2016

Pertumbuhan Dan Hasil Padi Gogo Hubungannya Dengan Kandungan Prolin Dan 2-Acetyl-1-Pyrroline Pada Kondisi Kadar Air Tanah Berbeda, A. Y. Rahayu, T. A.D. Haryanto, S. N. Iftitah

Jurnal Kultivasi

Penelitian ini bertujuan untuk mengetahui respons varietas padi gogo pada kadar air tanah berbeda terhadap pertumbuhan, hasil dan kandungan prolin dan 2-acetyl-1-pyrroline biji. Penelitian dilaksanakan di Universitas Tidar Magelang mulai bulan September 2012 sampai dengan Maret 2013. Percobaan menggunakan Rancangan Acak Kelompok Lengkap terdiri atas dua faktor yaitu varietas padi gogo (Inpago Unsoed-1, galur JSPGA 136, varietas Situ-bagendit (non-aromatik) dan varietas Mentik Wangi) dan tingkat kadar air tanah (100 % kapasitas lapang dan 50 % kapasitas lapang). Variabel pengamatan meliputi: tinggi tanaman (cm), jumlah anakan total per rumpun (batang), jumlah anakan produktif (batang), total panjang akar (m), umur berbunga (hst), …

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Pengaruh Konsentrasi Pupuk Organik Cair (Poc) Dan Dosis Pupuk N, P, K Terhadap Pertumbuhan Dan Hasil Tanaman Jagung Manis (Zea Mays L. Var Rugosa Bonaf) Kultivar Talenta, S. Puspadewi, Wawan Sutari, Kusumiyati Dec 2016

Pengaruh Konsentrasi Pupuk Organik Cair (Poc) Dan Dosis Pupuk N, P, K Terhadap Pertumbuhan Dan Hasil Tanaman Jagung Manis (Zea Mays L. Var Rugosa Bonaf) Kultivar Talenta, S. Puspadewi, Wawan Sutari, Kusumiyati

Jurnal Kultivasi

Percobaan bertujuan untuk mencari konsentrasi pupuk organik cair dan pupuk N, P, K yang terbaik terhadap pertumbuhan dan hasil tanaman jagung manis kultivar Talenta. Percobaan dilaksanakan dari bulan Maret hingga Mei 2014 di Kebun Percobaan Fakultas Pertanian Universitas Padjadjaran, Jatinangor, Sumedang dengan ketinggian tempat ± 750 m di atas permukaan laut. Percobaan dilakukan menggunakan metode percobaan di lapangan dengan Rancangan Acak Kelompok (RAK) yang terdiri dari tujuh perlakuan dan diulang empat kali yaitu: 1 dosis rekomendasi pupuk N, P, K; 1 kali konsentrasi pupuk organik cair; 2 kali konsentrasi pupuk organik cair; 1 kali konsentrasi pupuk organik cair + ½ …

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Can Sub-Saharan Africa Feed Itself?, Martin K. Van Ittersum, Lenny G. J. Van Bussel, Joost Wolf, Patricio Grassini, Justin Van Wart, Nicolas Guilpart, Lieven Claessens, Hugo De Groot, Keith Wiebe, Daniel Mason-D'Croz, Haishun Yang, Hendrik Boogard, Pepijn A. J. Van Oort, Marloes P. Van Loon, Kazuki Saito, Ochieng Adimo, Samuel Adjei-Nsiah, Alhassane Agali, Abdullahi Bala, Regis Chikowo, Kayuki Kaizzi, Mamoutou Kouressy, Joachim H. J. R. Makoi, Korodjouma Ouattara, Kindie Tesfaye, Kenneth G. Cassman Dec 2016

Can Sub-Saharan Africa Feed Itself?, Martin K. Van Ittersum, Lenny G. J. Van Bussel, Joost Wolf, Patricio Grassini, Justin Van Wart, Nicolas Guilpart, Lieven Claessens, Hugo De Groot, Keith Wiebe, Daniel Mason-D'Croz, Haishun Yang, Hendrik Boogard, Pepijn A. J. Van Oort, Marloes P. Van Loon, Kazuki Saito, Ochieng Adimo, Samuel Adjei-Nsiah, Alhassane Agali, Abdullahi Bala, Regis Chikowo, Kayuki Kaizzi, Mamoutou Kouressy, Joachim H. J. R. Makoi, Korodjouma Ouattara, Kindie Tesfaye, Kenneth G. Cassman

Department of Agronomy and Horticulture: Faculty Publications

Although global food demand is expected to increase 60% by 2050 compared with 2005/2007, the rise will be much greater in sub- Saharan Africa (SSA). Indeed, SSA is the region at greatest food security risk because by 2050 its population will increase 2.5-fold and demand for cereals approximately triple, whereas current levels of cereal consumption already depend on substantial imports. At issue is whether SSA can meet this vast increase in cereal demand without greater reliance on cereal imports or major expansion of agricultural area and associated biodiversity loss and greenhouse gas emissions. Recent studies indicate that the global increase …

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High Tunnel Tomato Variety Report Uri 2016, Andy Mark Radin Dec 2016

High Tunnel Tomato Variety Report Uri 2016, Andy Mark Radin

University of Rhode Island Vegetable Production Research Reports

No abstract provided.

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Pumpkin Variety Trial Uri 2016, Rebecca Brown Dec 2016

Pumpkin Variety Trial Uri 2016, Rebecca Brown

University of Rhode Island Vegetable Production Research Reports

No abstract provided.

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Butternut Squash Variety Trial Uri 2016, Rebecca Brown Dec 2016

Butternut Squash Variety Trial Uri 2016, Rebecca Brown

University of Rhode Island Vegetable Production Research Reports

No abstract provided.

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Mechanism Of Resistance, Gene Flow, And Integrated Management Of Ragweeds (Ambrosia) In Nebraska, Zahoor Ahmad Ganie Dec 2016

Mechanism Of Resistance, Gene Flow, And Integrated Management Of Ragweeds (Ambrosia) In Nebraska, Zahoor Ahmad Ganie

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Common ragweed (Ambrosia artemisiifolia L.) and giant ragweed (Ambrosia trifida L.) are native annual broadleaf weeds in the United States found in diverse agroecosystems, roadsides, and wastelands. They are economically important weed species in the Midwest and sources of pollen allergies. Confirmation of glyphosate-resistant (GR) common and giant ragweed in Nebraska justified the need to determine the mechanism of resistance, dispersal of resistance genes via pollen, and to develop an integrated management program. The objectives of this research were to: 1) determine the mechanism of glyphosate resistance in a common ragweed biotype from Nebraska; 2) evaluate the effect …

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Arkansas Soybean Performance Tests 2016, R. D. Bond, J. A. Still, D. G. Dombek Dec 2016

Arkansas Soybean Performance Tests 2016, R. D. Bond, J. A. Still, D. G. Dombek

Arkansas Agricultural Experiment Station Research Series

Soybean variety and strain performance tests are conducted each year in Arkansas by the University of Arkansas System Division of Agriculture’s Arkansas Crop Variety Improvement Program. The tests provide information to companies developing varieties and/or marketing seed within the State, and aid the Arkansas Cooperative Extension Service in formulating variety recommendations for soybean producers.

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Effect Of Smooth Bromegrass Management On Grazing Cattle Dung Decomposition, Co2 Flux, And Soil Nutrient Movement, Bradley D. Schick Dec 2016

Effect Of Smooth Bromegrass Management On Grazing Cattle Dung Decomposition, Co2 Flux, And Soil Nutrient Movement, Bradley D. Schick

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Rapid nutrient cycling improves forage quality and livestock production in pastures. Interseeding legumes may be a strategy to enhance N cycling, but effects of dung excreted from cattle grazing pastures with legumes on dung decomposition rates and soil N cycling have not been studied. Our objective was to evaluate how dung excreted from cattle grazing legume-interseeded, N-fertilized, and unfertilized smooth bromegrass (Bromus inermis Leyss.) pastures affects dung chemical composition, dry matter decomposition, CO­2 flux, and N availability in soil. Freshly deposited dung from yearling steers grazing legume-interseeded, N-fertilized, and unfertilized pastures was collected and placed as pats in …

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Characterization Of Ground Nozzles For Pesticide Applications, Ryan Henry Dec 2016

Characterization Of Ground Nozzles For Pesticide Applications, Ryan Henry

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Pesticide applications are a common component of crop production systems in the United States (US). For row crop systems (e.g. corn, soybean, or wheat), pesticides are applied by ground, aerial, or chemigation methods. The exact method of pesticide delivery is not universally regulated/ prescribed in the US, and the equipment and application technique are largely defined by the individual applicator. A wide variety of choices and decisions must be made by applicators to result in a successful pesticide application. Examples of these choices include proper active ingredient(s), carrier volume and equipment (e.g. nozzle type, spacing, and operating pressure) selection while …

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Managing Storage Pests Of Maize: Farmers' Knowledge, Perceptions And Practices In Western Kenya, Charles A.O. Midega, Alice W. Murage, Jimmy O. Pittchar, Zeyaur R. Khan Dec 2016

Managing Storage Pests Of Maize: Farmers' Knowledge, Perceptions And Practices In Western Kenya, Charles A.O. Midega, Alice W. Murage, Jimmy O. Pittchar, Zeyaur R. Khan

All Peer-Reviewed Publications

Insect pests are a key constraint to effective utilization of cereal crops in sub-Saharan Africa (SSA), with damage caused by these pests in the stores of particular concern. Although a number of approaches have been advanced for control of storage pests of maize, uptake remains a challenge, with effectiveness of some approaches being questionable. We conducted a survey in western Kenya among 330 respondents using face to face interviews and focus group discussions to evaluate farmers' practices, knowledge and perceptions of storage pests of maize, and their current practices in managing such pests as a basis for development of efficient …

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Exploring Factors That Shape Small-Scale Farmers’ Opinions On The Adoption Of Eco-Friendly Nets For Vegetable Production, F. Vidogbéna, A. Adégbidi, R. Tossou, F. Assogba-Komlan, T. Martin, M. Ngouajio, S. Simon, L. Parrot, S. T. Garnett, K. K. Zander Dec 2016

Exploring Factors That Shape Small-Scale Farmers’ Opinions On The Adoption Of Eco-Friendly Nets For Vegetable Production, F. Vidogbéna, A. Adégbidi, R. Tossou, F. Assogba-Komlan, T. Martin, M. Ngouajio, S. Simon, L. Parrot, S. T. Garnett, K. K. Zander

All Peer-Reviewed Publications

If agro-ecological systems are to realize their potential as sustainable alternatives to conventional agricultural systems, innovation diffusion needs to be enhanced. We conducted surveys among 214 small-scale vegetable farmers in Benin, a food-deficit country in West Africa, on how they perceived the different attributes of eco-friendly nets (EFNs). The nets act as physical barriers against insects in vegetable production and so reduce pesticide use. Understanding farmer perceptions about new technologies helps reveal farmers’ propensity to adopt them. Intensity of attitude was measured on a Likert scale, and an ordered probit model was used to determine which characteristics of nets were …

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On-Farm Maize Storage Systems And Rodent Postharvest Losses In Six Maize Growing Agro-Ecological Zones Of Kenya, Kukom Edoh Ognakossan, Hippolyte D. Affognon, Christopher M. Mutungi, Daniel N. Sila, Soul Kifouly G. Midingoyi, Willis O. Owino Dec 2016

On-Farm Maize Storage Systems And Rodent Postharvest Losses In Six Maize Growing Agro-Ecological Zones Of Kenya, Kukom Edoh Ognakossan, Hippolyte D. Affognon, Christopher M. Mutungi, Daniel N. Sila, Soul Kifouly G. Midingoyi, Willis O. Owino

All Peer-Reviewed Publications

Rodents are one of the major postharvest pests that affect food security by impacting on both food availability and safety. However, knowledge of the impact of rodents in on-farm maize storage systems in Kenya is limited. A survey was conducted in 2014 to assess magnitudes of postharvest losses in on-farm maize storage systems in Kenya, and the contribution of rodents to the losses. A total of 630 farmers spread across six maize growing agro-ecological zones (AEZs) were interviewed. Insects, rodents and moulds were the main storage problems reported by farmers. Storage losses were highest in the moist transitional and moist …

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Nuclear Factor [Erythroid-Derived 2]-Like 2’S (Nfe2l2) Gene Expression In Feed Efficiency And Oxidative Stress In Avian Muscle, Devin Wayne Cook Dec 2016

Nuclear Factor [Erythroid-Derived 2]-Like 2’S (Nfe2l2) Gene Expression In Feed Efficiency And Oxidative Stress In Avian Muscle, Devin Wayne Cook

Graduate Theses and Dissertations

Oxidative stress may play a role in the phenotypic expression of feed efficiency (FE). The transcription factor NFE2L2 (nuclear factor erythroid-derived 2-like 2) coordinates antioxidant response to oxidative stress and its activity is tightly regulated in part by KEAP1 (Kelch like-ECH protein 1) and the E3 ligase CUL3 (Cullin3). Thus, one objective was to determine mRNA expression of NFE2L2, KEAP1, and CUL3 as well as three antioxidant targets [glutathione peroxidase (GPx-1), superoxide dismutase 1 (SOD1), and superoxide dismutase 2 (SOD2)] in breast muscle of immature pedigree broiler males (8 wk), immature Japanese quail males (4 wk) divergently selected for high …

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Selection Of Reference Genes For Rt-Qpcr Analysis In Coccinella Septempunctata To Assess Un-Intended Effects Of Rnai Transgenic Plants, Chunxiao Yang, Evan L. Preisser, Hongjun Zhang, Yong Liu, Liangying Dai, Huipeng Pan, Xuguo Zhou Nov 2016

Selection Of Reference Genes For Rt-Qpcr Analysis In Coccinella Septempunctata To Assess Un-Intended Effects Of Rnai Transgenic Plants, Chunxiao Yang, Evan L. Preisser, Hongjun Zhang, Yong Liu, Liangying Dai, Huipeng Pan, Xuguo Zhou

Entomology Faculty Publications

The development of genetically engineered plants that employ RNA interference (RNAi) to suppress invertebrate pests opens up new avenues for insect control. While this biotechnology shows tremendous promise, the potential for both non-target and off-target impacts, which likely manifest via altered mRNA expression in the exposed organisms, remains a major concern. One powerful tool for the analysis of these un-intended effects is reverse transcriptase-quantitative polymerase chain reaction, a technique for quantifying gene expression using a suite of reference genes for normalization. The seven-spotted ladybeetle Coccinella septempunctata, a commonly used predator in both classical and augmentative biological controls, is a …

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Comparison Of The Production Of Bibb Lettuce Reared In Indoor Aquaponics System Using Large Mouth Bass (Micropterus Salmoides) Vs. Nile Tilapia (Oreochromis Niloticus), George J. Pate Nov 2016

Comparison Of The Production Of Bibb Lettuce Reared In Indoor Aquaponics System Using Large Mouth Bass (Micropterus Salmoides) Vs. Nile Tilapia (Oreochromis Niloticus), George J. Pate

Posters-at-the-Capitol

Aquaponics is a sustainable food production system that combines hydroponic plant growth with fish rearing in a recirculating aquaculture system. Nile tilapia (Oreochromis niloticus) are predominantly raised in aquaponics due to their fast growth rates and ability to tolerate a variety of water conditions. As aquaponics becomes more popular in temperate climate zones, farmers are looking for alternative fish species that are more compatible with cooler temperatures and have a higher market value than tilapia. Authors will determine if plant growth factors as well as, the availability of nutrients in aquaponic systems are affected by the difference in nutrient requirements …

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Arkansas Corn And Grain Sorghum Peformance Tests 2016, R. D. Bond, J. A. Still, D. G. Dombek Nov 2016

Arkansas Corn And Grain Sorghum Peformance Tests 2016, R. D. Bond, J. A. Still, D. G. Dombek

Arkansas Agricultural Experiment Station Research Series

Corn and grain sorghum performance tests are conducted each year in Arkansas by the University of Arkansas System Division of Agriculture. The tests provide information to companies marketing seed within the state, and aid the Arkansas Cooperative Extension Service in formulating recommendations for producers.

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Modeling Long-Term Corn Yield Response To Nitrogen Rate And Crop Rotation, Laila A. Puntel, John E. Sawyer, Daniel W. Barker, Ranae Dietzel, Hanna Poffenbarger, Michael J. Castellano, Kenneth J. Moore, Peter J. Thorburn, Sotirios V. Archontoulis Nov 2016

Modeling Long-Term Corn Yield Response To Nitrogen Rate And Crop Rotation, Laila A. Puntel, John E. Sawyer, Daniel W. Barker, Ranae Dietzel, Hanna Poffenbarger, Michael J. Castellano, Kenneth J. Moore, Peter J. Thorburn, Sotirios V. Archontoulis

Department of Agronomy and Horticulture: Faculty Publications

Improved prediction of optimal N fertilizer rates for corn (Zea mays L.) can reduce N losses and increase profits. We tested the ability of the Agricultural Production Systems sIMulator (APSIM) to simulate corn and soybean (Glycine max L.) yields, the economic optimum N rate (EONR) using a 16-year field-experiment dataset from central Iowa, USA that included two crop sequences (continuous corn and soybean-corn) and five N fertilizer rates (0, 67, 134, 201, and 268 kg N ha-1) applied to corn. Our objectives were to: (a) quantify model prediction accuracy before and after calibration, and report calibration steps; (b) …

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Spatial And Temporal Spread Of Maize Stem Borer Busseola Fusca (Fuller) (Lepidoptera: Noctuidae) Damage In Smallholder Farms, Frank T. Ndjomatchoua, Henri E.Z. Tonnang, Christophe Plantamp, Pascal Campagne, Clément Tchawoua, Bruno P. Le Ru Nov 2016

Spatial And Temporal Spread Of Maize Stem Borer Busseola Fusca (Fuller) (Lepidoptera: Noctuidae) Damage In Smallholder Farms, Frank T. Ndjomatchoua, Henri E.Z. Tonnang, Christophe Plantamp, Pascal Campagne, Clément Tchawoua, Bruno P. Le Ru

All Peer-Reviewed Publications

The main purpose of this study was to understand the spatio-temporal spread of the maize stem borer Busseola fusca (Fuller) (Lepidoptera: Noctuidae) in smallholder maize farms. The analysis carried out allowed the establishment of complementary sampling scheme and analysis that can be applied to investigate the propagation of stem borer damages and extended to other insect pests. This approach requires consideration of all plants point locations, the knowledge on the level of damage and its characterization. Results showed that there was a two-week interval between occurrence of the peaks of leaf damage and male adult moth abundance. The prior role …

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Productivity, Profitability And Partial Nutrient Balance In Maize-Based Conventional And Organic Farming Systems In Kenya, Noah Adamtey, Martha W. Musyoka, Christine Zundel, Juan Guillermo Cobo, Edward Karanja, Komi K.M. Fiaboe, Anne Muriuki, Monicah Mucheru-Muna, Bernard Vanlauwe, Estelle Berset, Monika M. Messmer, Andreas Gattinger, Gurbir S. Bhullar, Georg Cadisch, Andreas Fliessbach, Paul Mäder, Urs Niggli, Dionys Foster Nov 2016

Productivity, Profitability And Partial Nutrient Balance In Maize-Based Conventional And Organic Farming Systems In Kenya, Noah Adamtey, Martha W. Musyoka, Christine Zundel, Juan Guillermo Cobo, Edward Karanja, Komi K.M. Fiaboe, Anne Muriuki, Monicah Mucheru-Muna, Bernard Vanlauwe, Estelle Berset, Monika M. Messmer, Andreas Gattinger, Gurbir S. Bhullar, Georg Cadisch, Andreas Fliessbach, Paul Mäder, Urs Niggli, Dionys Foster

All Peer-Reviewed Publications

In 2007 two long-term trials were established in Kenya to contribute research-based evidence to the global debate on the productivity, economic viability and sustainability of different agricultural production systems. These trials compare conventional (Conv) and organic (Org) farming systems at high and low input levels at two locations, i.e. Chuka, with Humic Nitisols, high inherent soil fertility and rainfall, and Thika, with Rhodic Nitisols with low soil fertility and rainfall. The high input systems (High) represent commercial-scale, export-oriented production that uses the recommended amounts of fertilisers, pesticides and irrigation water to generate high yields, whilst the low input systems (Low) …

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Characterization And Development Mechanism Of Apios Americana Tuber Starch, Hanyu Yangchen, Vikas Belamkar, Steven B. Cannon, Jay-Lin Jane Oct 2016

Characterization And Development Mechanism Of Apios Americana Tuber Starch, Hanyu Yangchen, Vikas Belamkar, Steven B. Cannon, Jay-Lin Jane

Department of Agronomy and Horticulture: Faculty Publications

Apios americana is a wild legume-bearing plant with edible tubers. Domestication of Apios is in progress because of the superior nutritional value and health benefits of the tuber. Objectives of this study were to: (1) characterize physicochemical properties of the Apios tuber starch; and (2) understand differences in starch structures and properties between the mother (seed) and child (progeny) tubers and the mechanism of starch development. Granules of the Apios tuber starch displayed ellipsoidal, rod, or kidney shape with diameter ranges of 1–30 m. The mother tuber starches displayed greater percentage crystallinity, larger gelatinization enthalpy-changes, longer branch-chain lengths of amylopectin, …

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Genomics-Assisted Characterization Of A Breeding Collection Of Apios Americana, An Edible Tuberous Legume, Vikas Belamkar, Andrew Farmer, Nathan T. Weeks, Scott R. Kalberer, William J. Blackmon, Steven B. Cannon Oct 2016

Genomics-Assisted Characterization Of A Breeding Collection Of Apios Americana, An Edible Tuberous Legume, Vikas Belamkar, Andrew Farmer, Nathan T. Weeks, Scott R. Kalberer, William J. Blackmon, Steven B. Cannon

Department of Agronomy and Horticulture: Faculty Publications

For species with potential as new crops, rapid improvement may be facilitated by new genomic methods. Apios (Apios americana Medik.), once a staple food source of Native American Indians, produces protein-rich tubers, tolerates a wide range of soils, and symbiotically fixes nitrogen. We report the first high-quality de novo transcriptome assembly, an expression atlas, and a set of 58,154 SNP and 39,609 gene expression markers (GEMs) for characterization of a breeding collection. Both SNPs and GEMs identify six genotypic clusters in the collection. Transcripts mapped to the Phaseolus vulgaris genome–another phaseoloid legume with the same chromosome number–provide provisional genetic …

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Plants Having Increased Bomass And Methods For Making The Same, Aleel K. Grennan, Donald R. Ort, Stephen Patrick Moose, Damla D. Bilgin, Thomas Clemente, Fredy Altpeter, Stephen P. Long Oct 2016

Plants Having Increased Bomass And Methods For Making The Same, Aleel K. Grennan, Donald R. Ort, Stephen Patrick Moose, Damla D. Bilgin, Thomas Clemente, Fredy Altpeter, Stephen P. Long

Department of Agronomy and Horticulture: Faculty Publications

The impact of plastid size change in both monocot and dicot plants has been examined. In both, when plastid size is increased there is an increase in biomass relative to the parental lines. Thus, provided herein are methods for increasing the biomass of a plant, comprising decreasing the expression of at least one plastid division protein in a plant. Optionally, the level of chlorophyll in the plant is also reduced.

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Testing Predictions Used To Build An Agrivoltaics Installation On A Small-Scale Educational Model, Katie Kinney, Rebecca Minor, Greg Barron-Gafford Oct 2016

Testing Predictions Used To Build An Agrivoltaics Installation On A Small-Scale Educational Model, Katie Kinney, Rebecca Minor, Greg Barron-Gafford

STAR Program Research Presentations

Models are valuable tools for explaining and testing systems. Small-scale models can be especially useful for educational purposes. For models to be useful, they have to accurately depict the larger system that they are describing. A novel man-made system, known as an agrivoltaic structure, is being constructed at Biosphere 2 near Oracle, Arizona. The word agrivoltaic is a combination of agriculture and photovoltaics, or solar farming. My research involved creating a small-scale version of this system for educational purposes. The model of this system tested two predictions: that plants will grow better in the shade of a panel and that …

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