Agronomy and Crop Sciences Commons^™

The Dual Nature Of Weedy Rice (Oryza Sativa F. Spontanea): From A Noxious Weed To An Important Genetic Resource For Rice Improvement, Rica M. Rentino, Vanessa Sernicula, May O. Palanog, Roselyn G. Alfetche, Dan Michael A. Angay, Francis L. Tejada, Dexter G. Balboa, Shaireen M. Angay, Fatima-Nasra A. Sahadain, Teodora E. Mananghaya, Karl Vincent J. Jose, Liezel C. Llanes, Jonathan M. Niones, Karla Mae R. Nonog, Frodie F. Waing, Leonilo Gramaje, Albert Christian S. Suner, Ommal H. Abdulkadi, Norvie L. Manigbas, Jose E. Hernandez, Alvin D. Palanog

The Philippine Agricultural Scientist

Weedy rice (Oryza sativa f. spontanea) is becoming a serious threat to rice production in the Philippines, especially in direct-seeding rice areas, owing to its high competitiveness and its similarity to cultivated rice in morphology and ecological requirements. However, weedy rice can be considered both a threat that endangers rice production and an opportunity, as it offers a potential source of novel genes for rice improvement. This study evaluated the extent of weedy rice infestation in direct-seeding areas in the Visayas, measured the phenotypic and genotypic diversity of collected weedy rice ecotypes using simple sequence repeat (SSR) markers, and …

Improvement Of Forage Productivity By Intercropping Pakchong 1 And Napier Grass With Mungbean And Soybean In Los Baños, Laguna, Philippines, Paul Joshua C. Marquez, Eureka Teresa M. Ocampo, Menandro M. Loresco, Lourdes S. Edano Ma, Agapita J. Salces

The Philippine Agricultural Scientist

Forage demand is rising in the Philippines, and to sustainably boost agronomic performance, the beneficial impact of intercropping was investigated. This study characterized the performance of high-yielding forages, namely Napier grass (NG) and Pakchong 1 (PK), when intercropped with soybean (SB) and mungbean (MB) under rain-fed conditions in Los Banos, Laguna. The experiment was conducted in a repeated-measures RCBD replicated 3 times with grass species and cropping system as main factors, resulting in the following treatment combinations: Sole NG, Sole PK, NGSB, NGMB, PKSB, and PKMB. Grasses were ratooned, legumes were harvested, and legume seeds were re-sown every 45 to …

Integrative Effects Of Mycorrhizal Fungi, Azotobacter, And Azospirillum With Different Nitrogen Levels On Morphophysiological Responses And Drought Tolerance Of Maize (Zea Mays L.) ‘Sc706’ Under Varying Water Deficit Conditions, Nozar Shamohammadi, Mahdi Zare, Korosh Ordookhani, Farshid Aref, Shahram Sharafzadeh

The Philippine Agricultural Scientist

Under drought stress, soil fertility declines sharply, restricting nutrient availability and reducing plant productivity. This study evaluated the effects of mycorrhiza, Azotobacter, and Azospirillum combined with nitrogen on the morpho-physiological traits of maize (Zea mays L.) hybrid SC706 plants under different water deficit conditions. The experiment was conducted at a research field in Fars Province, Iran, over 2 consecutive years (2017–2018, 2018–2019) and applied a split-split plot design based on a Randomized Complete Block Design (RCBD) with 3 replicates. It assessed the effects of the 3 biological fertilizers in 4 treatment groups (Control [B1], inoculation with mycorrhiza alone …

Improvement Of Forage Productivity By Intercropping Pakchong 1 And Napier Grass With Mungbean And Soybean In Los Baños, Laguna, Philippines, Paul Joshua C. Marquez, Eureka Teresa M. Ocampo, Menandro M. Loresco, Ma Lourdes S. Edano, Agapita J. Salces

The Philippine Agricultural Scientist

Forage demand is rising in the Philippines, and to sustainably boost agronomic performance, the beneficial impact of intercropping was investigated. This study characterized the performance of high-yielding forages, namely Napier grass (NG) and Pakchong 1 (PK), when intercropped with soybean (SB) and mungbean (MB) under rain-fed conditions in Los Banos, Laguna. The experiment was conducted in a repeated-measures RCBD replicated 3 times with grass species and cropping system as main factors, resulting in the following treatment combinations: Sole NG, Sole PK, NGSB, NGMB, PKSB, and PKMB. Grasses were ratooned, legumes were harvested, and legume seeds were re-sown every 45 to …

Heterosis For Flowering Time And Leaf Traits In F1 Hybrids From Desi And Kabuli Chickpeas [Research Note], Gizem Kamçi, Behiye Tuba Biçer

The Philippine Agricultural Scientist

The study was conducted at the Faculty of Agriculture in Dicle University, Southeast Anatolia, Türkiye, during the 2023 growing season to estimate heterosis, heterobeltiosis, and dominance for phenological, leaf, and plant traits in F₁ hybrids from desi × kabuli and kabuli × kabuli chickpea crosses. In 2022, 2 desi (Black, ICCV 10) and 3 kabuli (Azkan, ILC 533, ILC 482) chickpea varieties were crossed, producing 10 hybrids and 5 parents evaluated in a randomized complete block design with 3 replications. Significant variation was found among genotypes for all traits. Days to first flowering ranged from 55.7 to 69.0 d, with …

Heterosis For Flowering Time And Leaf Traits In F1 Hybrids From Desi And Kabuli Chickpeas [Research Note], Gizem Kamçi, Behiya Tuba Biçer

The Philippine Agricultural Scientist

The study was conducted at the Faculty of Agriculture in Dicle University, Southeast Anatolia, Türkiye, during the 2023 growing season to estimate heterosis, heterobeltiosis, and dominance for phenological, leaf, and plant traits in F₁ hybrids from desi × kabuli and kabuli × kabuli chickpea crosses. In 2022, 2 desi (Black, ICCV 10) and 3 kabuli (Azkan, ILC 533, ILC 482) chickpea varieties were crossed, producing 10 hybrids and 5 parents evaluated in a randomized complete block design with 3 replications. Significant variation was found among genotypes for all traits. Days to first flowering ranged from 55.7 to 69.0 d, with …

Spatial Variability Of Nitrates And Nitrogen Mineralization Kinetics And Their Effects In Long-Term Tillage Systems, Bibash Rokaya

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

Nitrogen (N) and water management are essential for water quality protection and crop production. However, soil N and water are spatiotemporally variable. Soil water spatial dependencies are described in the literature with known associations with preferential flows among other factors. In contrast, a knowledge gap exists on the spatial dependence of soil N mineralization kinetics. We hypothesize that soil N mineralization kinetics and soil water have distinct and cross-correlated spatial characteristics among soil management practices and climatic regions. For the field study, we measured soil-N mineralization kinetics, volumetric water content (VWC), and a suite of soil properties along ~70 m …

Evaluation Of Publicly Available Maize Germplasm Adaptation To Environments In Nebraska, Garrett Snodgrass

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

Publicly available maize germplasm represents an important resource for breeding programs seeking to expand genetic diversity and improve hybrid performance. However, effective use requires characterization of per se phenotypic performance of parental lines and evaluation of the parental line’s hybrid progeny adaptation to a given target population of environments. Furthermore, understanding population structure and heterotic grouping is imperative for maximizing efficiency of breeding decisions. The objectives of this study were to (1) evaluate phenotypic performance of parental lines and hybrids across environments in Nebraska, and to (2) refine heterotic group classification of parental lines within the University of Nebraska-Lincoln’s Hybrid …

Arkansas Soybean Performance Tests 2025, J. F. Carlin, T R. Faske, T L. Roberts, T. N. Spurlock, T. D. Swanson, R. D. Bond, J. C. Mccoy, C. J. Bulloch

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.

Wayne E. Sabbe Arkansas Soil Fertility Studies 2025, Nathan A. Slaton

Arkansas Agricultural Experiment Station Research Series

Rapid technological changes in crop management and production require that the research efforts be presented in an expeditious manner. The contributions of soil fertility and fertilizers are major production factors in all Arkansas crops. The studies described within will allow producers to compare their practices with the university’s research efforts. Additionally, soil-test data and fertilizer sales are presented to allow comparisons among years, crops, and other areas within Arkansas.

To Hold Or Sell Breeding Cattle In The Rangelands, Department Of Primary Industries And Regional Development, Western Australia

Animal production and livestock factsheets

In a dry season where feed, water and finances are limited, removing less productive animals as soon as possible is a good option. This will free up feed for more productive animals and help preserve ground cover.

This page provides some of the information and a process for making decisions about holding or selling breeding cattle.

Weather Conditions Associated With Citrus Canker Incidence Caused By Aw Strain In The Lower Rio Grande Valley Of South Texas, Amit Sharma, Teresa Patricia Feria-Arroyo, George Yanev, Madhurababu Kunta

School of Integrative Biological & Chemical Sciences Faculty Publications

Citrus canker, caused by bacterium Xanthomonas citri subsp. citri (Xcc), affects the citrus industry by making the fruit unmarketable due to unsightly lesions on the fruit. Citrus canker caused by a relatively new AWstrain of Xcc was reported on the citrus trees in the residential areas of the Lower Rio Grande Valley (LRGV) of South Texas. Xcc AW has a limited host range, predominantly affecting limes and a few other citrus species. Previous work has reported prevailing environmental conditions that influence the incidence and spread of the citrus canker caused by the Asiatic A strain. However, no information is available …

Micronutrients (Trace Elements) For High Rainfall Pastures In Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

Micronutrient deficiencies can result from removal of agricultural products over many years, changes in soil acidity, or from large increases in plant biomass production and export. This page is specific to high rainfall pastures (more than 600mm average annual rainfall) in the south-west of Western Australia.

The Department of Primary Industries and Regional Development recommends tissue testing to check plant micronutrient nutrient needs.

Potassium For High Rainfall Pastures In Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

Potassium (K) deficiency can lead to a decline in clover content and severely limit pasture productivity in high rainfall pastures. Large amounts of potassium can be lost each year through leaching and removal of potassium in hay or silage.

This information is specific to high rainfall pastures receiving more than 600mm average annual rainfall in the south-west of Western Australia.

Soil Sampling High Rainfall Pastures In Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

Soil sampling and testing is an essential part of making good fertiliser decisions. Fertilisers are a large cost to farming pastures in high rainfall areas. This page is specific to sampling high rainfall pastures (more than 600mm average annual rainfall) in the south-west of Western Australia.

The Department of Primary Industries and Regional Development recommends soil sampling and testing as part of a plant nutrient management program.

Sulfur For High Rainfall Pastures In Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

Sulfur deficiency can substantially reduce pasture yield on sandy soils, particularly in wet years where the sulfate form of sulfur leaches below the root zone of pasture plants, making it unavailable.

This information applies specifically to high rainfall pastures (over 600mm average annual rainfall) in the south-west of Western Australia.

The Department of Primary Industries and Regional Development recommends basing fertiliser decisions on good evidence (soil and tissue test results)

Tissue Sampling And Analysis For High Rainfall Pastures In Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

Tissue testing helps identify nutrient deficiencies that impact plant health. In high rainfall areas ( > 600 mm), pastures are highly productive and have greater demand for both macro- and micronutrients. Micronutrient status is best assessed through plant tissue, as soil levels are difficult to measure accurately.

The Department of Primary Industries and Regional Development recommends tissue testing to assess the effectiveness of fertiliser and soil testing programs, and diagnose emerging macronutrient and micronutrient deficiencies that could cause production losses.

Environmental Impact Of Nitrogen And Phosphorus Fertilisers In High Rainfall Pasture Areas Of Western Australia, Department Of Primary Industries And Regional Development, Western Australia

Natural resources factsheets

The most commonly used nitrogen and phosphorus fertilisers in the high rainfall (>600mm annual average) south-west of Western Australia can be leached into the groundwater and washed into waterways, resulting in serious environmental and economic damage.

The Department of Primary Industries and Regional Development recommends regular soil testing and consultation with FertCare-accredited advisers to reduce leaching losses and increase profit from added nutrients.

Soil Nutrient Sufficiency Versus Plant Nutrient Status In Compost-Amended Soils: Plant Tissue Analysis As A Diagnostic Tool, Chandralekha Joga Miss

Murray State Theses and Dissertations

This study evaluated whether Mehlich III soil nutrient sufficiency ratings reliably predict plant nutrient status and chlorophyll response across contrasting compost application histories. A greenhouse pot experiment was conducted with Chijimisai (Brassica rapa) planted in three treatment soils that had no compost (T1), moderate compost history (T2), and long-term hog manure compost application (T3). Plant performance was assessed through weekly shoot length and chlorophyll content (SPAD) measurements, leaf number at maturity, and leaf tissue nutrient analysis conducted at harvest. Soil test results indicated adequate to high nutrient levels across all three treatments. Leaf tissue analysis, however, revealed substantial …

An Analysis Of Systemic And Contact Herbicide Usage Trends In Illinois Corn Production Systems, Paige E. Mckittrick

Murray State Theses and Dissertations

Herbicide use is central to weed management in Illinois corn production; however, long-term changes in the balance between systemic and contact herbicides have not been well quantified at the statewide scale. This study analyzes herbicide trends in Illinois corn from 1982 to 2016 using secondary data from the USDA Agricultural Chemical Use Survey, paired with climate, regulatory, and herbicide resistance information. Herbicide active ingredients were classified into systemic and contact functional categories and grouped according to Weed Science Society of America (WSSA) mode-of-action (MOA) codes. For each survey year, total herbicide load (lb a.i./acre), functional proportions, MOA-specific contributions, and a …