Agronomy and Crop Sciences Commons^™

Improving The Efficiency Of Soybean Breeding With High-Throughput Canopy Phenotyping, Fabiana Freitas Moreira, Anthony Ahau Hearst, Keith Aric Cherkauer, Katy Martin Rainey

Purdue University Libraries Open Access Publishing Fund

Background: In the early stages of plant breeding programs high-quality phenotypes are still a constraint to improve genetic gain. New field-based high-throughput phenotyping (HTP) platforms have the capacity to rapidly assess thousands of plots in a field with high spatial and temporal resolution, with the potential to measure secondary traits correlated to yield throughout the growing season. These secondary traits may be key to select more time and most efficiently soybean lines with high yield potential. Soybean average canopy coverage (ACC), measured by unmanned aerial systems (UAS), is highly heritable, with a high genetic correlation with yield. The objective of …

Evaluation Of Soil Type And Seeding Rate On Winter Cover Crop Species In A Soybean Production System, Donna S. Morgan

LSU Doctoral Dissertations

The integration of winter annual cover crops into a cropping system can potentially improve soil health and crop production, however, the impact of variables such as seeding rates, across two very different soil types, has not been well documented. A two-year study was conducted at the Dean Lee Research Station and Extension Center in Alexandria, Louisiana to evaluate the effects of cover crop seeding rate and soil type on cover crop biomass, weed suppression, soil fertility, and soybean (Glycine max L) growth and yield. Analysis of potential economic impacts was also performed to estimate financial net returns for three …

Evaluation Of A Global Spring Wheat Panel For Stripe Rust: Resistance Loci Validation And Novel Resources Identification, Ibrahim Elbasyoni, Walid M. El-Orabey, Sabah Morsy, P. S. Baenziger, Zakaria Al Ajlouni4, Ismail M. Dweikat

Department of Agronomy and Horticulture: Faculty Publications

Stripe rust (incited by Puccinia striiformis f. sp. tritici) is airborne wheat (Triticum aestivum L.) disease with dynamic virulence evolution. Thus, anticipatory and continued screening in hotspot regions is crucial to identify new pathotypes and integrate new resistance resources to prevent potential disease epidemics. A global wheat panel consisting of 882 landraces and 912 improved accessions was evaluated in two locations in Egypt during 2016 and 2017. Five prevalent and aggressive pathotypes of stripe rust were used to inoculate the accessions during the two growing seasons and two locations under field conditions. The objectives were to evaluate the panel for …

Metabolic Dynamics Of Developing Rice Seeds Under High Night-Time Temperature Stress, Balpreet K. Dhatt, Nathan Abshire, Puneet Paul, Kalani Hasanthika, Jaspreet Sandhu, Qi Zhang, Toshihiro Obata, Harkamal Walia

Department of Agronomy and Horticulture: Faculty Publications

High temperature stress during rice reproductive development results in yield losses. Reduced grain yield and grain quality has been associated with high temperature stress, and specifically with high night-time temperatures (HNT). Characterizing the impact of HNT on the phenotypic and metabolic status of developing rice seeds can provide insights into the mechanisms involved in yield and quality decline. Here, we examined the impact of warmer nights on the morphology and metabolome during early seed development in six diverse rice accessions. Seed size was sensitive to HNT in four of the six genotypes, while seed fertility and seed weight were unaffected. …

Legacy Effects Of Biodegradable Mulch And Soil Amendments On Vegetable Crops And The Soil, Elise V. H. Reid

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

Plastic film mulches are used in horticulture to manage weeds, improve water retention, and increase soil temperature. Bioplastics and biofabrics are potentially sustainable alternatives to plastic film; however, they have different rates of in soil degradation. Polylactic acid (PLA) is a 100% biobased polymer that degrades slowly, but could fulfill organic certification to be soil incorporated. Mater-Bi is a commercially available biodegradable plastic (bioplastic), which degrades quickly, but cannot be incorporated in organic systems. Our objectives were to determine the individual and combined effects of soil amendments and residual mulch on vegetable crop yield and soil fertility. In a two-year …

Organic Agriculture Teaching And Learning In 2025: Transforming The Future Learning Landscape, Randa Jabbour, Charles A. Francis, Mary Barbercheck, Katharina S. Ullman

Department of Agronomy and Horticulture: Faculty Publications

University instructors are compelled to anticipate future changes in farming and food systems that will impact their students. Sixteen educators met in 2018 to envision the future of organic agriculture courses needed by 2025. Likely future global issues include food access, especially for people of limited economic means; climate change; and fossil fuel costs. Changes that will impact education are increasing demand for quality food, more organic production, and globalization of food systems due to consolidation. Probable course content changes are increasing focus on whole farm systems; designing for resilience in changing physical, economic, environmental, and political climates; and increasing …

Ghd8 Controls Rice Photoperiod Sensitivity By Forming A Complex That Interacts With Ghd7, Peng Wang, Rong Gong, Ying Yang, Sibin Yu

Department of Agronomy and Horticulture: Faculty Publications

Background: Flowering time is one of the most important agronomic characteristics that ultimately determine yield potential and eco-geographical adaptation in crops. Ghd8 and Ghd7, two major flowering genes, have similar functions and large pleiotropic effects in controlling the heading date, plant height and grain yield of rice. However, these gene interactions at the genetic and molecular levels have not been determined to date.

Results: In this study, we investigated the genetic interaction between Ghd8 and Ghd7 by using a set of near-isogenic lines and a panel of natural germplasm accessions in rice. We found that Ghd8 affected multiple agronomic traits …

Understanding Nitrogen Limitation In Soybean, Nicolas Cafaro La Menza

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

Meeting soybean demand on existing cropland area for a global population of 9.7 billion people by the year 2050 requires narrowing the existing gap between average producer yield and yield potential. Soybean relies on two sources on nitrogen (N): biological N₂ fixation and indigenous soil N supply. As soybean yield continues to increase, it seems critical to know if there is a yield level at which potential contribution of indigenous nitrogen sources and fixation becomes insufficient to meet crop N requirements for high yields, while still maintaining or increasing protein and oil concentration. This study evaluated N limitation across …

Exploitation Of Wastelands For Fodder Production And Agroforestry, Gurbachan Singh

IGC Proceedings (1977-2023)

Natural resources degradation for agricultural production and environmental protection has been a matter of concern for future food, nutrition, environment and livelihood security. As per current estimates, 120.7 million hectare (mha) is under degraded or wastelands. These lands provide ample opportunity for growing fodder trees and grasses to bridge the gap between demand and supply of green and dry fodder.Several species of fodder trees and grasses have been identified and their agro-techniques standardized for raising in different categories of wastelands such as affected by soil and wind erosion, salinity, acidity and mining etc. A brief account of such plants is …

Application Of Autofluorescence For Confocal Microscopy To Aid In Archaeoparasitological Analyses, Johnica Jo Morrow, Christian Elowsky

Department of Agronomy and Horticulture: Faculty Publications

Confocal laser scanning microscopy (CLSM) was used to examine archaeoparasitological specimens from coprolites associated with La Cueva de los Muertos Chiquitos (CMC) located near present-day Durango, Mexico. The eggs for 4 different types of parasites recovered from CMC coprolites were imaged using CLSM to assist with identification efforts. While some of the parasite eggs recovered from CMC coprolites were readily identified using standard light microscopy (LM), CLSM provided useful data for more challenging identifications by highlighting subtle morphological features and enhancing visualization of parasite egg anatomy. While other advanced microscopy techniques, such as scanning electron microscopy (SEM), may also detect …

Analysis Of Mutations In West Australian Populations Of Blumeria Graminis F. Sp. Hordei Cyp51 Conferring Resistance To Dmi Fungicides, Madeline A. Tucker, Francisco J. Lopez-Ruiz, Hans J. Cools, Jonathon G L Mullins, Kithsiri W. Jayasena, Richard P. Oliver

Biosecurity Research Articles

BACKGROUND

Powdery mildew caused by Blumeria graminis f. sp. hordei (Bgh) is a constant threat to barley production but is generally well controlled through combinations of host genetics and fungicides. An epidemic of barley powdery mildew was observed from 2007 to 2013 in the West Australian grain belt.

RESULTS

We collected isolates across Australia, examined their sensitivity to demethylation inhibitor (DMI) fungicides and sequenced the Cyp51B target gene. Five amino acid substitutions were found, of which four were novel. The most resistant haplotypes increased in prevalence from 0% in 2009 to 16% in 2010 and 90% in 2011. …

Grains, Seeds And Hay Industry Funding Scheme Annual Report 2018/2019, Department Of Primary Industries And Regional Development, Western Australia

Biosecurity published reports

The Grains, Seeds and Hay Industry Funding Scheme (IFS) has been operating since 2010 to address biosecurity threats relevant to Western Australia’s (WA) grains, seeds and hay industry. The Scheme was established under the Biosecurity and Agriculture Management Act 2007 to enable growers to identify the pest and disease priorities at a whole-of-industry level and raise funds for activities to address these priorities.

There are currently three Industry Funding Schemes in operation. In addition to the Grains, Seeds and Hay IFS, there is a Cattle IFS and a Sheep and Goat IFS. The three IFSs operate in a similar manner. …

Canavalia And Dolichos Extracts For Sustainable Pest Biocontrol And Plant Nutrition Improvement In El Salvador, Carlos Martinez

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

Botanical repellents and pesticides are now being rediscovered as new tools for integrated pest management in order to reduce the use of toxic chemicals in crop production. Canavalia gladiata and Dolichos lablab are two Fabaceae very well adapted to farmlands of El Salvador, effective as living barriers and mostly as cover crops, however, they are not yet very well disseminated. This document describes the potential for using the liquid extracts and the dry flour of raw seeds of those plants for economic benefit and practical convenience for pest management in Salvadorian agriculture under field conditions. Seed extracts were useful when …

Challenges And Opportunities For Weed Control In Nebraska Popcorn, Ethann R. Barnes

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

Weed control in popcorn is challenging with limited herbicide options and popcorn’s perceived sensitivity to herbicides. Understanding the impact of weeds maximizes yield and profit. New herbicide-resistant crops increase chances of drift or misapplication into popcorn, which doesn’t have herbicide-resistant traits. Herbicides that are labeled in popcorn are often only conditionally labeled with reduce rates, warnings, or limited popcorn types. Dent-sterility in popcorn is contingent on the Ga1 gene (Ga1-s), but this system is at risk from Ga1-m field corn introduced from Mexico because it overcomes dent-sterility. This risk is under-assessed as Ga1-m carriers are undocumented and Mexican germplasm usage …

Arkansas Corn And Grain Sorghum Performance Tests 2019, J. F. Carlin, R. D. Bond, J. A. Still

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. The 2019 corn performance tests contained 74 hybrids and were conducted at the Northeast Research and Extension Center (NEREC) at Keiser, the Lon Mann Cotton Research Station (LMCRS) near Marianna, the Bell Farming Company near Des Arc, the Rohwer Research Station (RRS) near Rohwer and the Rice Research and Extension Center (RREC) near Stuttgart. The 2019 …

Silicon Fertilization In Rice And Wheat: Dynamics With Trace Elements And Effect Of Silicate Slag Granular Size On The Release Pattern Of Monosilicic Acid In Soil, Wooiklee S. Paye

LSU Doctoral Dissertations

Studies were conducted to evaluate the impact of silicon (Si) fertilization on the uptake of harmful trace elements in Louisiana rice production system, and document the effect of silicate slag granular size on its ability to supply Si in wheat. The influence of silicate slag and lime on the uptake and translocation of harmful trace elements in rice grain was determined. Results showed that both slag and lime had similar effects on pH at five of the nine sites investigated. Soil Si was significantly (P <0.001) increased with application of silicate slag at all sites. Lime and silicate slag had no effect on the concentration of trace elements in soil. However, increasing Si rates were negatively correlated with arsenic (As) and cadmium (Cd) concentration in rice grain. The release pattern of monosilicic acid (H₄SiO₄) from wollastonite and silicate slag was compared in a wheat greenhouse …

United States Midwest Soil And Weather Conditions Influence Anaerobic Potentially Mineralizable Nitrogen, Jason D. Clark, Kristen S. Veum, Fabian G. Fernandez, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Daniel E. Kaiser, Newell R. Kitchen, Carrie A.M. Laboski, Emerson D. Nafziger, John E. Sawyer, John F. Shanahan

Agronomy, Horticulture and Plant Science Faculty Publications

Nitrogen provided to crops through mineralization is an important factor in N management guidelines. Understanding of the interactive effects of soil and weather conditions on N mineralization needs to be improved. Relationships between anaerobic potentially mineralizable N (PMN_an) and soil and weather conditions were evaluated under the contrasting climates of eight US Midwestern states. Soil was sampled (0–30 cm) for PMN_an analysis before pre-plant N application (PP_0N) and at the V5 development stage from the pre-plant 0 (V5_0N) and 180 kg N ha⁻¹ (V5_180N) rates and incubated for 7, 14, …

Measuring Bird Damage To Three Fruit Crops: A Comparison Of Grower And Field Estimates, Julie L. Elser, Catherine A. Lindell, Karen M. M. Steensma, Paul D. Curtis, Deanna K. Leigh, William F. Siemer, Jason Boulanger, Stephanie A. Shwiff

Biology Faculty Publications

Birds are common pests in fruit orchards. They frequently consume and damage fruit resulting in decreased yields for growers. The true extent of damage is difficult to measure. Producer surveys are often implemented to estimate damage, but the accuracy of these estimates is uncertain. We compared damage estimates obtained through field studies with estimates from a producer survey for three fruit crops: wine grapes, sweet cherries, and ‘Honeycrisp’ apples. We also analyzed relationships between use of various damage management methods and levels of bird damage. We found wine grape and sweet cherry growers accurately assessed bird damage, while ‘Honeycrisp’ apple …

Arkansas Wheat Cultivar Performance Tests 2018-2019, R. E. Mason, R. G. Miller, D. E. Moon, J. P. Kelley

Arkansas Agricultural Experiment Station Research Series

Wheat cultivar performance tests are conducted each year in Ark- ansas by the University of Arkansas System Division of Agriculture’s Arkansas Agricultural Experiment Station, Department of Crop, Soil and Environmental Sciences. The tests provide information to companies developing cultivars and marketing seed within the state and aid the Arkansas Cooperative Extension Service in formulating cultivar recommendations for small-grain producers. The tests are conducted at the Northeast Research and Extension Center at Keiser, the Vegetable Substation near Kibler, the Lon Mann Cotton Research Station near Marianna, the Newport Extension Center near Newport, the Rohwer Research Station near Rohwer, the Pine Tree …

Summaries Of Arkansas Cotton Research 2018, Fred Bourland

Arkansas Agricultural Experiment Station Research Series

Arkansas ended the 2018 season ranked 5th nationally in harvested acres (480,000 acres), 4th in lint yield (1150 lb/acre), and 4th in total production (1,150,000 bales). The string of consecutive years with good yields is helping to drive the increase in cotton acres. Harvest and ginning capacity is a major limiting factor for acre expansion. Cotton planting intentions for 2019 released in late March are at 580,000 acres, up 20% from the 485,000 acres planted in 2018. This continues to push the ginning capacity of 28 gins in 2018 and on-farm picker capacity to the limit. Optimism for cotton is …

Variable Rate Irrigation Of Maize And Soybean In West-Central Nebraska Under Full And Deficit Irrigation, J Burdette Barker, Sandeep Bhatti, Derek M. Heeren, Christopher M.U. Neale, Daran Rudnick

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Variable rate irrigation (VRI) may improve center pivot irrigation management, including deficit irrigation. A remote-sensing-based evapotranspiration model was implemented with Landsat imagery to manage irrigations for a VRI equipped center pivot irrigated field located in West-Central Nebraska planted to maize in 2017 and soybean in 2018. In 2017, the study included VRI using the model, and uniform irrigation using neutron attenuation for full irrigation with no intended water stress (VRI-Full and Uniform-Full treatments, respectively). In 2018, two deficit irrigation treatments were added (VRI-Deficit and Uniform-Deficit, respectively) and the model was modified in an attempt to reduce water balance drift; model …

Precision Agriculture Gis Technologies For Mississippi, 1st. Edition, Amelia A.A. Fox

CALS Publications

Precision agriculture is meant to improve on-farm efficiency in hopes of ultimately increasing profitability while also protecting the environment. However, this difficult process almost always includes the proper management and interpretation of data. Therefore, it is imperative that those individuals involved in making such decisions are educated on these processes. In a data-driven world, this textbook is a great resource for those wanting to learn how to utilize their data in hopes of making better informed on-farm decisions.

Respons Pertumbuhan Dan Hasil Tanaman Hanjeli (Coix Lacryma-Jobi L.) Terhadap Kombinasi Jarak Tanam Dan Jenis Pupuk Kandang Di Dataran Medium Sukasari, Sumedang, Ruminta, Tati Nurmala, Aep Wawan Irwan, Yakup Antonius Surbakti

Jurnal Kultivasi

Penelitian ini bertujuan untuk mengetahui pengaruh jarak tanam dan jenis pupuk kandang yang memberikan pengaruh terbaik terhadap pertumbuhan dan hasil tanaman hanjeli (Coix Lacryma-jobi L.). Penelitian ini telah dilaksanakan dari bulan Desember 2015 hingga bulan Mei 2016 di desa Sindangsari, Sukasari, Sumedang. Lokasi penelitian memiliki ketinggian ± 800 m di atas permukaan laut (dpl) termasuk tipe iklim C3 menurut klasifikasi Oldemann. Rancangan percobaan menggunakan Rancangan Acak Kelompok (RAK) terdiri dari sembilan perlakuan dengan tiga kali ulangan, sehingga total terdapat 27 petak percobaan, yaitu jarak tanam 50 x 50 cm + pupuk kandang ayam 5 ton/ha, jarak tanam 50 x 50 …

Pengaruh Campuran Herbisida Berbahan Aktif Atrazin 500 G/L Dan Mesotrion 50 G/L Terhadap Gulma Dominan Pada Tanaman Jagung (Zea Mays L.), Denny Kurniadie, Uum Umiyati, Sarah Shabirah

Jurnal Kultivasi

Pengendalian gulma dengan menggunakan herbisida tunggal bila dilakukan terus menerus akan menimbulkan gulma resisten. Pencampuran herbisida perlu dilakukan untuk menanggulanginya. Campuran herbisida dengan dua atau lebih jenis bahan aktif dapat bersifat sinergis, aditif, atau antagonis. Tujuan dari penelitian adalah untuk mengetahui sifat campuran herbisida Atrazin 500 g/L + Mesutrion 50 g/L terhadap beberapa jenis gulma dominan pada tanaman jagung. Percobaan dilaksanakan pada bulan November 2018 sampai Januari 2019, di Rumah Kaca Fakultas Pertanian Unpad, Jatinangor. Perlakuan terdiri dari tiga jenis herbisida dengan enam tingkat dosis, yaitu herbisida tunggal Atrazin (1200, 600, 300, 150, 75, 0 g/ha), Mesotrion (120, 60, 30, …

Respons Kedelai Akibat Jarak Tanam Dan Konsentrasi Giberelin Pada Tanah Inceptisol Jatinangor, Aep Wawan Irwan, Agus Wahyudin, Toto Sunarto

Jurnal Kultivasi

Teknik budidaya untuk meningkatkan produktivitas kedelai antara lain penggunaan jarak tanam yang tepat dan penambahan input berupa giberelin. Penelitian ini bertujuan untuk memperoleh jarak tanam dan konsentrasi yang tepat agar pertumbuhan dan hasil meningkat. Percobaan dilakukan pada bulan Juli sampai Oktober 2017 di Kebun Percobaan Ciparanje, Fakultas Pertanian Universitas Padjadjaran, dengan ketinggian tempat yaitu ± 780 meter di atas permukaan laut. Percobaan dilakukan dengan menggunakan Rancangan Acak Kelompok pola faktorial, dengan tiga ulangan. Faktor I adalah jarak tanam, terdiri dari 3 taraf, yaitu: jarak tanam 25 cm X 25 cm, jarak tanam 15 cm X 15 cm X 40 cm …

Pengaruh Pupuk Biosilika Terhadap Pertumbuhan, Hasil, Dan Kekerasan Biji Tanaman Hanjeli (Coix Lacryma-Jobi L.) Varietas Batu Dan Pulut, Tati Nurmala, Anni Yuniarti, Winna Firdawati, Warid Ali Qosim

Jurnal Kultivasi

Tujuan dari penelitian adalah untuk mengetahui dosis pupuk silika organik yang tepat yang memberikan pengaruh terbaik terhadap pertumbuhan, hasil, dan kekerasan biji hanjeli (Coix lacryma-jobi L.). Penelitian dilaksanakan di Kebun Percobaan Fakultas Pertanian UNPAD, Ciparanje, Jatinangor, sejak bulan Desember 2015 sampai Mei 2016. Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok (RAK) yang terdiri dari 12 perlakuan dan 4 ulangan. Perlakuan terdiri enam taraf dosis pupuk biosilika (arang kulit biji hanjeli pulut yang mengandung 12% SiO2) masing-masing per ha adalah 0 kg; 150 kg; 300 kg; 450 kg; 600 dan 750 kg pada dua jenis hanjeli batu (var. Stenocarpa) dan …

Impact Of Pesticide Regulation On Innovation In The United States And European Union, Brooke D. Schafer

The Journal of Purdue Undergraduate Research

No abstract provided.

Pengaruh Komposisi Media Tanam Dan Waktu Aplikasi Zat Pengatur Tumbuh Terhadap Pertumbuhan Dan Hasil Benih Kentang (Solanum Tuberosum L.) G2 Kultivar Medians Di Dataran Medium Jatinangor, Jajang Sauman Hamdani, Tessa Prima Dewi, Wawan Sutari

Jurnal Kultivasi

Kentang termasuk jenis sayuran komersial bernilai tinggi yang dapat dijadikan sebagai pangan alternatif. Rendahnya ketersediaan benih kentang dapat berpengaruh terhadap produksi kentang. Terbatasnya lahan penanaman kentang di dataran tinggi sehingga diperlukan ekstensifikasi di dataran medium melalui rekayasa media tumbuh dan hormon tumbuh yang bisa mengurangi efek negatif penanaman kentang di dataran medium. Percobaan ini bertujuan untuk mengetahui interaksi antara komposisi media tanam dengan waktu aplikasi zat pengatur tumbuh terhadap pertumbuhan dan hasil benih kentang G2 kultivar Medians di dataran medium Jatinangor. Percobaan dilaksanakan di Kebun Percobaan Ciparanje, Fakultas Pertanian, Universitas Padjadjaran, Jatinangor. Rancangan percobaan yang digunakan yaitu Rancangan Acak Kelompok …

Pengaruh Dosis Kascing Dan Bioaktivator Terhadap Pertumbuhan Dan Hasil Tanaman Sawi (Brassica Juncea L.) Yang Dibudidayakan Secara Organik, Agus Wahyudin, Aep Wawan Irwan

Jurnal Kultivasi

Peningkatan produktivitas sawi (Brassica juncea L.) dapat dilakukan secara organik. Tujuan penelitian ini untuk mengetahui pengaruh dosis kascing dan penggunaan bioaktivator terhadap pertumbuhan dan hasil tanaman sawi. Rancangan yang digunakan adalah Rancangan Acak Kelompok (RAK), terdiri atas sembilan kombinasi perlakuan dan diulang empat kali, masing-masing kombinasi perlakuan adalah: tanpa kascing dan tanpa bioaktivator; kascing 5 ton/ha dan tanpa bioaktivator; kascing 5 ton/ha dan bioaktivator 4 mL/L; kascing 10 ton/ha dan tanpa bioaktivator; kascing 10 ton/ha dan bioaktivator 4 mL/L; kascing 15 ton/ha dan tanpa bioaktivator; kascing 15 ton/ha dan bioaktivator 4 mL/L; kascing 20 ton/ha dan tanpa bioaktivator; serta kascing …

Dinamika P-Tersedia Pada Limbah Cair Kelapa Sawit Dengan Beberapa Land Application, Koko Tampubolon, Melina Vika, Debora

Jurnal Kultivasi

Ketersediaan P sangat rendah pada land application perkebunan kelapa sawit di Sumatera Utara dibandingkan unsur N dan K. Tujuan penelitian ini untuk mengetahui ketersediaan P yang terdapat pada land application, hubungannya terhadap produksi TBS, serta membandingkan dinamika P-tersedia beberapa perkebunan kelapa sawit lainnya. Penelitian ini dilaksanakan dengan pengambilan sampel tanah land application pada Blok A88B dan A88E Afdeling 1 Kebun Teluk Panji, Kecamatan Kampung Rakyat Kabupaten Labuhanbatu Selatan, Sumatera Utara. Analisis tanah dilakukan di Laboratorium Kesuburan Tanah, Fakultas Pertanian Universitas Sumatera Utara dan Laboratorium Analitik dan Quality Control Asian Agri, Tebing Tinggi. Penelitian ini dilaksanakan pada bulan Juni sampai dengan …