Agriculture Commons^™

Glutathione Alleviates Boron Toxicity By Modulating Nitrogen Metabolism And Boronuptake In Rice Seedlings, Lei Zhang, Lizhu Suo, Yan Shan, Bo Wang

Turkish Journal of Agriculture and Forestry

Boron (B) toxicity is an abiotic stressor in plants due to the narrow threshold range between B deficiency and B toxicity.Glutathione (GSH) has been reported to reduce abiotic stress in plants, but its effect on B toxicity alleviation, particularly in riceseedlings, is not clear. Therefore, the present research yields information on the antioxidant mechanism, nitrogen metabolism, cell wallcomponents, and B concentrations that allow rice seedlings to withstand the adverse effects of B toxicity by GSH application. The resultssuggest that B toxicity suppressed the growth traits of rice. However, GSH treatment exhibited a positive influence on the growth ofrice seedlings. GSH …

Grafting Success And Quality Of Hazelnut Plants: Impact Of Grafting Methods, Clones And Bonding Materials, Sava Džankić, Sandra Bijelić, Borivoje Bogdanović, Goran Jaćimović, Hülya Ünver

Turkish Journal of Agriculture and Forestry

Despite favourable agro-ecological conditions, there is a significant gap between the real demand for hazelnut fruits and the state of production in the Republic of Serbia. However, over the past few decades, hazelnut production has been significantly enhanced through establishing orchards with grafted seedlings. As hazelnut grafting has predominantly relied on the whip and tongue method until recently, there has been a need to explore other grafting methods of Corylus avellana L. on generative rootstocks of Corylus colurna L. The aim of this study was to comparatively investigate the grafting of three clones of C. avellana using four grafting methods, …

Morphological And Physiological Root Traits And Expression Of The Gene Relationship Withnitrogen Uptake In Wheat (Triticum Aestivum L.), Hafeez Noor, Pengcheng Ding, Farhana Kausar, Fida Noor, Zhai Wenbo, Min Sun, Zhiqiang Gao, Sajid Faiz, Kotb A. Attia, Latifa Alhusnain

Turkish Journal of Agriculture and Forestry

Wheat (Triticum aestivum L.) is considered important cereal crops worldwide, ensuring food security post green revolution. Our study results displayed an elevation of 10.6% in root weight density, 15.0 % of root volume density during flowering stage, respectively. The highly significant values for root weight density, root length density and root bulk density were recorded under nitrogen application of 180 kh ha-1 both at flowering and maturity stage. Moreover, delayed senescence and increase in photosynthetic rate were observed during middle and late stages of flowering enhancing light energy interception and improvement in its utilization. The cultivar Yunhan-20410 exhibited a significant …

Influence Of Nitrate Levels On Plant Growth And Carbon And Nitrogen Metabolismin Cucumber (Cucumis Sativus L.) Under Low Light Stress, Syed Aizaz Ali Shah, Yuzi Shi, Jing Nie, Xuehui Yao, Yicong Guo, Muhammad Ahmad, Syed Atizaz Ali Shah, Faisal Hayat, Yasmin Niamat, Hali̇l İbrahim Öztürk, Xiaolei Sui

Turkish Journal of Agriculture and Forestry

Photosynthesis is critically dependent on both adequate light and nitrogen availability. In controlled agricultural environmentswith limited natural light, cucumber faces substantial challenges, including reduced photosynthetic efficiency and biomass accumulation.Nitrogen (N) is a vital component for the synthesis of various macromolecules, metabolites, and signaling molecules in plants. This studyassessed the impact of different nitrate levels (LL-N, LL-1/2N, and LL-2N) on the physiological, biochemical, and metabolic responsesof cucumber under low light conditions (80–100 μmol m–2 s–1 photosynthetic photon flux density) in comparison to standard light(400–500 μmol m–2 s–1 photosynthetic photon flux density) and unchanged nitrate. We observed that increasing nitrate levels to …

The Purification, Characterization, And Inhibition Profile Of Some Herbicides Ofglutathione S-Transferase From Broccoli, Hacer Erdem Kiziltunç, Hali̇s Şaki̇roğlu, Mi̇ne Aksoy

Turkish Journal of Agriculture and Forestry

Herbicide selectivity is determined by the variability of herbicide degradation processes in weeds and crops. GlutathioneS-transferases (GSTs) have been widely studied in plants because of their role in herbicide metabolism. GSTs metabolize herbicides bycatalyzing reduced glutathione (GSH) conjugation. The significance of GSTs in herbicide metabolism has been understood by examiningGST in some plants. In this study, a GST enzyme was purified from broccoli using an affinity chromatography (glutathione agarose)method to contribute to the elucidation of plant GSTs. A characterization of the purified broccoli GST enzyme was then carried out.In the last step, the inhibition profiles of some selected types of …

Control Of Mango Anthracnose (Colletotrichum Gloeosporioides) By Essential Oil Mixture, Chau Trung Duong, Huynh Thi Phuong Thao, Doan Minh Khang, Nguyen Thi Nhu Y, Tran Chi Nhan, Bui Thi Cam Huong, Nguyen Trong Tuan, Nguyen Thi Ngoc Truc, Dương Minh Tuệ, Luu Thai Danh

Turkish Journal of Agriculture and Forestry

Mixing two or more essential oils (EOs) may increase effectiveness of mango anthracnose control. In this study, EOs from a wide range of plant materials were hydro-distilled and chemically characterized. EOs were tested against in vitro growth of Colletotrichum gloeosporioides. EOs with the highest antifungal toxicity were selected for the interactive experiments. The results showed that orange had the highest extraction yield (4.94%), followed by lemon, pomelo, citronella, turmeric, ginger, lemongrass (LG), cinnamon bark (CB), cinnamon leaf (CL) and basil. Trans-cinnamaldehyde was the most abundant compound of CB (91.3%) and CL (94.1%) EO. Limonene was principle constituent of orange (97%), …

Combined Physiological And Biochemical Analysis And Molecular Biotechnology For Atrazine Residue Reduction In Soybeans, Fenglan Hu, Yan Ding

Turkish Journal of Agriculture and Forestry

To address the problem of atrazine residue in soybeans affecting the ecological environment and human health, in the presentstudy it is proposed to combine the bioorganic fertilizer DNBF10 and the highly efficient degrading bacterial strain AT-b3 with themagnetic biochar carrier MBC to form a novel DMBC-P bioremediation technology. The results indicated that the DMBC-P technologycould effectively reduce the residual amount of atrazine in soybeans and significantly enhance their growth and physiological indexes bypromoting atrazine degradation and phosphorus utilization and reducing oxidative stress. At the physiological and biochemical levels,DNBF10 significantly alleviated atrazine-induced oxidative stress, reducing the IBRv2 values to 1.84 and …

Optimal Pollen Viability And Vigor Among Varieties Of Tagnanan Tall Coconut(Cocos Nucifera L.), Xi Yun Liew, Mohd Norsazwan Ghazali, Mohd Firdaus Ismail, Zarina Abd Ghafar, Mohd Syarbani Bin Ismar, Vasudevan Venkatachalam, Uma Rani Sinniah

Turkish Journal of Agriculture and Forestry

Controlled pollination, involving the transfer of pollen from Tagnanan Tall palm (male parent) to the Malayan Yellow or Red dwarf (female parent) is essential for producing MATAG coconut hybrids. However, the pollen from Tagnanan Tall (TAGT), usedin hybridization, has been reported to have a germination percentage of less than 40%. This is further complicated by Tagnanan Tall varieties varying in color, TAGT Orange, TAGT Gold, and TAGT Green. TAGT Orange is claimed to have lower pollen viability than TAGT Gold and Green. Hence, a study was conducted to compare inflorescence characteristics, pollen yield, size, viability, and vigor of three Tagnanan …

Bioethanol Yield Of The Sorghum × Sudangrass Hybrid Under Arid And Semiaridconditions: Nitrogen Dose Effects, Orthogonal Comparisons, And Component Analyses, Hali̇t Tutar

Turkish Journal of Agriculture and Forestry

The sorghum x sudangrass hybrid is highly significant as a biofuel crop due to its high biomass production, drought tolerance, ability to adapt to various climatic conditions, and high sugar content in its stems. This research aimed to determine the effects of six different nitrogen dose treatments on ethanol yield, yield parameters, and fertilizer use relationships in sorghum x sudangrass hybrid plants at two locations in 2021 and 2022. The experiment was established according to the randomized block design with three replicates. Nitrogen treatments were applied as N0 (0 kg da-1), N5 (5 kg da-1), N10 (10 kg da-1), N15 …

Advances In Hyperspectral Remote Sensing For Precision Fertilization Decision-Making: A Comprehensive Overview, Jing Nie, Ke Wu, Yang Li, Jingbin Li, Bohan Hou

Turkish Journal of Agriculture and Forestry

With the rapid development of Internet of Things (IOT), big data analysis, artificial intelligence and other technologies, precision agriculture is receiving more and more attention and emphasis worldwide. Precision agriculture (PA), also known as fine agriculture and precision agriculture, refers to an agricultural method that obtains spatial and temporal variability information on crop yields and environmental factors (e.g., soil structure, topography, plant nutrients, water content, pests and diseases, etc.) in farm plots through high-tech to achieve positioning, timing, and quantification of the implementation of modern farming operation techniques and management.And fertilizer application plays an indispensable role in agricultural production. Reasonable …

Providing Proteins To Belizean Residents Through Poultry Products, Ellis Freel

Poultry Science Undergraduate Honors Theses

Belize is a food insecure, developing country. Although Belize has plenty of nutritious food in-country, the exportation of that food to generate income contributed to a distribution issue of that nutritious food. More impoverished areas of Belize do not have access to nutritious food because of the lack of affordability and high export rates. Diets with a lack of food, or lack of balanced, nutritious food can negatively impact growth and cognitive development, especially in children. Poultry is one of the only products in Belize not able to be exported. Implementing poultry into Belizean diets would affordably alleviate food insecurity …

A Historical Assessment Of The Number Of Days Required To Plant The Arkansas Soybean Crop, Bayarbat Badarch, K. Bradley Watkins, Terry Griffin

Agricultural Economics and Agribusiness Faculty Publications and Presentations

The primary objective of this paper is to quantitatively analyze the number of acres planted per suitable fieldwork day and the total number of fieldwork days available for the complete planting of soybeans (Glycine max L.) in Arkansas. Total days to plant soybeans in each spring from 1980 to 2023 averaged about 33 days, indicating that roughly 33 days are expected, on average, from the month of April to May based on USDA-NASS weekly crop progress and condition data. Furthermore, the average soybean planted acres is estimated at 106,736 acres per day within the study period. Recently, variations in …

Value Of Horticulture Industries In Western Australia 2022-2023, Manju Radhakrishnan, Rohan Prince

Horticulture published reports

The horticulture sector in Western Australia (WA) produces high quality fruit, vegetables, nuts and amenity horticulture. Western Australians benefit from consuming this steady supply of diverse, affordable and sustainably grown fresh fruit and vegetables. Amenity horticulture, in the form of parks and gardens, adds a great richness to the quality of life in WA.

It is estimated that WA produced $1.75 billion worth of fruit, vegetables, nuts and amenity horticulture in 2022–23. The real value1 of production at the wholesale level increased by 4% when compared to the 2020 figures presented in the report, Situation analysis of horticulture in Western …

Western Australian Soil Groups - A Diagnostic Key To Identify Soils In Western Australia (5th Edition), Paul Galloway, Dennis Van Gool, Angela Stuart-Street, Edward A. Griffin, Shahab Pathan, Noel R. Schoknecht

Resource management technical reports

The aim of the Western Australian soil groups (WA soil groups) is to classify soils of Western Australia into a limited set using criteria that are easy to recognise in the field. It is a general-purpose classification with a focus on agronomic and rangeland grazing potential. The WA soil groups are designed for WA needs. It complements the Australian Soil Classification (ASC) by grouping the continuum of soils into a limited set of soil types, which simplifies soil variability for generalists, allows soil surveyors to create standardised soil-type legends for mapping products and permits further analyses of spatial data for …

Quantifying Temperature Effects On Development Rate And Plant Quality Of Compact Container-Grown Tomato, Morgan Humphrey, Ryan W. Dickson, Sonali Padhye

Horticulture Faculty Publications and Presentations

Mean daily temperature effects on plant development rates and quality were evaluated for compact container-grown tomato (Solanum lycopersicum). Compact tomato varieties ‘Siam’ and ‘Red Velvet’ were grown in greenhouses at 18 to 26 °C (Expt. 1) and 20 to 30 °C (Expt. 2) under supplemental high-pressure sodium lighting and 16-h photoperiod. The number of days to first open flower, first ripe fruit and from flower to ripe fruit were measured and development rates calculated by taking the reciprocal (e.g., 1/d). Temperature effects were predicted by fitting a linear (for first open flower) and a nonlinear exponential function (for …

Role Of Chemical Priming Agents In Modulating Germination Response To Enhance Crop Eetablishment In Cereal Crops, Shubh Pravat Singh Yadav, Dipesh Kumar Mehata, Sujan Bhandari, Netra Prasad Ghimire, Susmita Bhattarai, Indira Kattel, Shobha Pokhrel, Sangita Bhujel

Extension Publications

Seed priming is a critical pre-sowing strategy to enhance germination and early seedling vigour under diverse environmental conditions. This study evaluated the effects of various priming agents, including Boric acid, DAP, CaCO3, FeCl2, Urea, PEG (5%), CuSO4, MOP, PEG (10%), and ZnSO4, on germination parameters-germination percentage (GP), germination speed (GS), germination energy (GE), and vigour index (VI)-across rice, wheat, and maize varieties. A two factorial experiment was conducted using a completely randomized design, with ANOVA revealing significant effects (p < 0.001) of variety, treatment, and their interaction on germination traits. The results demonstrated that FeCl2 significantly improved germination in rice, particularly for the BRRI Dhan-66 variety, while CaCO3 and PEG treatments showed varying efficacy across crops. In wheat, the Bijaya variety exhibited superior performance with CaCO3 treatment, whereas DAP was more effective for Banganga. Maize showed the highest germination rates overall, with Sundarharaicha-LR1 responding positively to ZnSO4 and boric acid. Correlation and PCA analyses highlighted strong interdependence among germination traits, with GS and GP emerging as robust indicators. Varietal clustering in PCA revealed genetic variability in response to priming agents. This study provides valuable insights into optimizing priming techniques for enhancing seed performance in cereals. The findings emphasize the importance of tailored priming strategies based on crop species and variety to maximize agricultural productivity.

Evaluation Of Biochar As A Remediation Tool For Aminopyralid Contaminated Compost, Steven James Parris

Masters Theses & Specialist Projects

Aminopyralid is a synthetic auxin herbicide which is applied to grass pastures to control broadleaf weed populations. Aminopyralid can contaminate compost through inputs derived from treated pastures such as manure and grass clippings. This possibility poses the threat of inadvertent herbicide exposure to sensitive vegetable plants through using compost contaminated with aminopyralid. Biochar can absorb pollutants and has a synergistic effect with compost when applied to the compost mixture. This study examined the relationship between biochar and aminopyralid through compost consisting of dairy manure and sawdust 1:1 mixture, aminopyralid (10μg/kg), and biochar at four treatment levels of total mass of …

What’S The Beef? Current Trends Of The Florida Beef Cattle Industry As Perceived By Florida Beef Cattle Industry Leaders, Micah Gallagher, Matt Benge, Lauri Baker

Journal of Human Sciences and Extension

Agriculture plays a vital role in Florida’s economy, as it is the second largest industry behind tourism. Additionally, Florida is a leading cow-calf production state in the United States which is impacted by numerous factors internal and external to the industry itself. The Theory of Reasoned Action was used to explore current trends of the Florida beef cattle industry as perceived by Florida cattle industry leaders. Thirteen themes emerged from the data, such as environmental protection and alternative proteins. Florida ranchers need support from government entities to continue participation in conservation, education, and improvement of the cattle industry in Florida. …

Condition And Management Futures In A Quaking Aspen Recreation Area. Final Report To Snyderville Basin Special Recreation District, Paul C. Rogers, Georgie Corkery, Anna B. Miller

Aspen Bibliography

In partnership with Snyderville Basin Special Recreation District (SBSRD), we undertook a study of ecological conditions and user preferences within a quaking aspen recreational destination forest. The location, in two sections know as Run-A-Muk and Right Turn Sage (RAM/RTS), has experienced some forest die-off in the principally aspen dominated forest dissected by ski, bike, and hiking trails. Graduate student Georgie Corkery led the study and successfully completed a Master's degree, in addition to providing needed information to SBSRD regarding the status, uses, and preferred actions at this facility. Key outcomes regarding aspen conditions include assigning causal factors—ungulate browsing and elevated …

Napa Valley Certified Organic Viticulture Napa Valley Vineyards Go Green: Transitioning To Organic Cultivation, Eric E. Tapia

Undergraduate Honors Theses

The shift to sustainable agriculture in Napa Valley necessitates certified organic vineyards among wine industry stakeholders to facilitate systemic change. Nonetheless, numerous impediments—such as fiscal constraints, inadequate access to information, and agricultural education—are intended to address these barriers for fostering an environmental stewardship program focused on innovation and sustainability. The methods employed to investigate the transition to organic vineyards include qualitative and quantitative approaches, such as interviews with vintners and data analysis of annual crop yields and the economic impact of certified organic vineyards in Napa Valley. The investigation reveals that vineyard proprietors face significant early challenges, including a steep …

Assessment Of Drought Tolerance In Mung Bean [Vigna Radiata (L.) Wilczek] Through Phenology, Growth, Protein Yield, And Cluster Heatmap Analysis, Rafiqul Islam, Jamil Hossain, Shamsul Huda, Mohammad Golam Azam, Faruk Hossain, Aktar Uz Zaman, Safiqul Moula, Nasir Uddin Ahmed, Jamal Hossain, Ayman El Sabagh, Mohammad Sohidul Islum

The Philippine Agricultural Scientist

Mung bean [Vigna radiata (L.) Wilczek] cultivation is challenging under the changing climate as less precipitation during the summer season, which is becoming increasingly common, results in soil moisture deficiency and affects production especially at the early growth stages. Hence, this study was conducted to assess the phenology, growth, and protein yield traits of mung bean related to drought tolerance. Eight mung bean genotypes were grown in pots inside a rain-out shelter under well-watered (WW) and water-deficit (WD) conditions. These genotypes included four water stress-tolerant genotypes: G-1 (BARI Mung-8), G-2 (BMX-010015), G-3 (BMX-08010-2), and G-4 (BMX-08009-7), as well as four …

Morphological And Physiological Changes Of Katuray (Sesbania Grandiflora) During Seed Maturation [Research Note], Alangelico San Pascual, Lucille Elna De Guzman, Maurice Gravidez, Elijah Estante

The Philippine Agricultural Scientist

Katuray (Sesbania grandiflora), whose flowers are consumed as steamed vegetables, is an important green manure crop in the Philippines. Understanding different processes leading to seed maturity can aid in determining S. grandiflora’s seed quality, preventing premature harvesting for seed increase, ensuring efficient propagation and production of seedlings, and breeding new varieties of this crop. Multiple flowers were tagged, and three to five pods were collected five days after anthesis (DAA) and at a five-day interval thereafter until 100% germination was achieved. Seed size, moisture content (MC), dry weight, germination percentage, and embryo development were observed and recorded. Seed length was …

Comparing Conventional And Modified Cage Wheel Performance In Lowland Conditions, Rosalinda Abad, Michael Duldulao, Arthur Fajardo

The Philippine Agricultural Scientist

In agricultural production, significant cost consumption from tillage due to high energy input and low work performance may be reduced by improving the design of hand tractor components, specifically tractive devices. This study aimed to compare the field performance of conventional and modified cage wheels for hand tractors in terms of field efficiency (FE), wheel slip, and fuel consumption (FC). Using the Philippine standard methods of testing for walking-type tractors and a two-tailed t-test to analyze the data, results showed that the modified cage wheel had an FE of 90.09%, wheel slip of 7.78%, FC of 0.22 L/h, and FC …

Rehydration Kinetics Of Green Pea Grains Dried At Different Microwave Powers, Serap Kayisoglu

The Philippine Agricultural Scientist

In this study, both untreated and pre-treated green pea grain samples dried at different microwave output powers (90, 180, and 360 W) were rehydrated at three different temperatures (30ºC, 50ºC, and 70ºC). The rehydration kinetics of dried peas were analyzed using both the Peleg and the first-order kinetic models. Observations revealed that the Peleg model exhibited better agreement with the experimental data. As both microwave power and rehydration temperature increased, the rehydration capacity also increased in both pre-treated and untreated peas. The highest moisture content was observed after rehydration in pre-treated peas dried at 360 W microwave power (2.80 g …

Bioactivity And Synergism Of Tagpo (Ardisia Tomentosa) Molluscicidal Extracts, Darwin C. Gomez, Grechelle Socias, Rosemarie Galanza, Florlyn C. Gayas Ma., Fe T. Piedad, Brian John Sarno

The Philippine Agricultural Scientist

Population control of golden apple snails (GAS, Pomacea canaliculata) is beneficial in rice farming; however, the associated control measures can be expensive and time-consuming. Currently, farmers use synthetic molluscicides such as niclosamide to control GAS infestation, but this has some drawbacks. For example, niclosamide has broad toxicity to non-target organisms and negatively affects the growth of rice seedlings. Plant extracts with potent bioactivity and low toxicity to non-target organisms are attractive alternatives to synthetic molluscicides. In this study, the bioactivity of the crude fruit extract of tagpo (Ardisia tomentosa) was assessed against GAS and tilapia (Oreochromis niloticus) fries. The potential …

Comparative Analysis Of Household Food And Nutrition Security In Selected Philippine Urban And Rural Households During The Covid-19 Pandemic, Jay-Al Reyes, Julieta Delosreyes

The Philippine Agricultural Scientist

This study analyzed the food and nutrition security of selected urban and rural households in Pili, Camarines Sur, Philippines during the COVID-19 pandemic. It determined the prevalence of food insecurity among the selected urban and rural households, analyzed the determinants of food insecurity in these households, determined the prevalence of malnutrition, and assessed the relationship between the households’ food security and nutrition security. Primary data from a survey of 185 urban and rural households and secondary data from the Electronic Operation Timbang Plus (e-OPT) Tool were used to determine the prevalence of food insecurity using the Food Insecurity Experience Scale …

Metagenomic Sequencing For Early Detection Of Future Engineered Pandemics: Foreshadowing The Privacy Challenge, Nir Eyal, Bridget Williams, Kevin M. Esvelt, Jane R. Bambauer

UF Law Faculty Publications

In this commentary, we imagine how a global system of metagenomic sequencing could be governed in order to reap the benefits and manage the risks. Global institutional engineers and their academic partners would need to develop a new governance model to ensure that all partners involved in a global metagenomic surveillance system cooperate as needed.

Site Position, Tillage, And Soil Depth Effects On Soil Properties In A Furrow-Irrigated Rice Field On A Silt-Loam Soil, Hannah Nobles, Kristofor Brye, Diego Della Lunga

Crop, Soil and Environmental Sciences Undergraduate Honors Theses

The fundamental agronomic shift from conventional agricultural methods to conservation agriculture relies on understanding soil nutrient stratification with depth and under different tillage treatments. Assessment of nutrient stratification in the dynamic conditions of furrow-irrigated rice (Oryza sativa) systems in eastern Arkansas is absent. The objective of this study was to evaluate the effects of tillage [i.e., conventional tillage (CT) and no tillage (NT], site position (i.e., up-, mid-, and down-slope), soil depth interval (i.e., 0-10 and 10-20 cm), and their interaction on the difference (i.e., end of the season minus beginning of the season) in select soil chemical …

Analyzing Food Sources And Food Insecurity Of Kichwa Farming Families In The Ecuadorian Amazon, Reina Watanabe

Crop, Soil and Environmental Sciences Undergraduate Honors Theses

While the right to food is internationally recognized and the United Nations established the sustainable development goal to end hunger and achieve food security by 2030, many households remain without consistent access to food in 2024. In Latin America, approximately 4 in 10 households were reported as food insecure in 2020 with higher rates in rural and indigenous communities. Rural areas, which have great overlap with indigenous communities in Ecuador, experience disproportionately high levels of poverty and food insecurity compared to urban areas. The most populous indigenous nationality in the Ecuadorian Amazon and the participants of this study are the …

Soybean Seed Yield Distribution Within The Canopy As Affected By Nitrogen Supply, Lucia Bonfanti

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

Soybean [Glycine max (L.) Merr.] seed yield is influenced by the seasonal availability of resources (i.e., nutrients, light, and water). While nitrogen (N) supply is becoming a soybean yield-limiting factor, the N-induced effect in seed yield components is still unclear. The objective of this research was to assess the effect of N supply on soybean yield components distribution within the canopy. A Full-N treatment, which provided the crop with ample N supply, was compared against a Zero-N treatment in which the crop relied on soil N and biological N fixation at nine high-yielding irrigated soybean environments in Nebraska, with …