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Fife, T
Falen, C
Hammermeister, E
Israelsen, C
Buxton, E
Wildfong, D
Barben, S
Buck, R
Zhu-Barker, X
Okorie, B
Bremer, E
Foster, M.J
Hergert, G
Beck, D
Wood, B
Westfall, D
Hines, S
Olsen, S
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Authors
Greer, K
Wiebe, J
Bremer, E
Bremer, E
Yi, Q
Horwath, W
Haas, S
Zhu-Barker, X
Zapata, D
Zhu-Barker, X
Steenwerth, K
Horwath, W
Webb, B
Hopkins, B
Ellsworth, J
Barben, S
Nichols, B
Jolley, V
Reese, C
Clay, D
Beck, D
Englund, R
Walworth, J
Pond, A
Nunez, H
Wood, B
Kilby, M
Westfall, D
Khosla, R
Shaver, T
Hopkins, B
Buxton, E
Jolley, V
Christensen, R
Cardon, G
Barnhill, J
Pace, M
Israelsen, C
Miner, D
Greenhalgh, L
Banks, S
Shao, M
Rothlisberger, D
Olsen, S
Hole, P
Khosla, R
Westfall, D
Frasier, W
Koch, B
Moore, A
Brown, B
Ippolito, J
Hines, S
de Haro Marti, M
Falen, C
Chahine, M
Fife, T
Norell, R
Greer, K
Wildfong, D
Hicks, D
Hammermeister, E
Bremer, E
Shapiro, C
Ferguson, R
Wortmann, C
Shaver, T
Krienke, B
Hergert, G
Maharjan, B
Greer, K
Bremer, E
Sievers, T
Fahning, S
Searle, T
Weigel, A
Buck, R
Hopkins, T
Hopkins, B
Cole, D
Woolley, R
Buck, R
Hopkins, B
Bremer, E
Madsen, I
Greer, K
Okorie, B
Yost, M
Deep, K
Howard , N
Hopkins, B
Foster, M.J
Nelson, S.V
Sannar, R.E
Bremer, E
Greer, K
Hopkins, B
Topics
Recycled and Repurposed Nutrient Sources
Manure and Compost Management
Nutrient Management of Horticultural Crops
Nutrient Cycling in Regenerative Agriculture
Student Posters
Type
Oral
Poster
Year
2021
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2019
2023
2025
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Authors

Filter results22 paper(s) found.

1. Repurposing Zinc from Mining Tire Waste to a Fertilizer Resource

Zinc (Zn) deficiency is common on high pH soils when growing field crops like Corn, Barley and Wheat.  Not only are crop yields and quality limited by low Zn, but more importantly the dilution of Zn in food stuffs and, thereby, Zn deficiency in the human diet has become a major concern as recognized by the World Health Organization.  At the same time, there is a Global problem in proper repurposing/disposal of used tires that contain between 1-3% ZnO.  In fact, in Chile, the... K. Greer, J. Wiebe, E. Bremer

2. Factors Influencing Efficacy of Elemental Sulphur Fertilizers

Elemental sulfur is a byproduct of fossil fuel production and produced in large quantities in both the US and Canada.  Fertilizers containing elemental S have a high S content and low manufacturing cost, but may not reliably meet crop requirements for S in the year of application due to the time required for elemental S to be oxidized.  The main factors influencing the oxidation rate of elemental S are particle size, particle dispersion and environmental conditions.  Previous... E. Bremer

3. Compost Application in California Tomato Cropping Systems

With the implementation of California Assembly Bill (AB) 341 the availability of composts such as green waste (GW) and co-composted green waste and food waste (FW) as a soil amendment is increasing. The use of those organic amendments in agricultural production systems has been recommended as an effective strategy to make full use of organic waste and improve soil health. However, little information is available to tomato growers to reassess N inputs from using GW and FW. This study was conducted... Q. Yi, W. Horwath, S. Haas, X. Zhu-barker

4. Evaluating Cover Crops for Nitrogen Management in a Walnut Orchard

Cover crops provide numerous benefits in agricultural systems. From increasing soil water storage to reducing fertilizer inputs, quantifying cover crops benefits is crucial in nutrient management, crop productivity, environmental sustainability, and growers' adoption. The goal of this study was to quantify nitrogen (N) and carbon (C) inputs in a walnut  (Juglans regia L. 'Chandler') orchard that implemented three cover crop mixtures. The study site was a 5-year-old walnut... D. Zapata, X. Zhu-barker, K. Steenwerth, W. Horwath

5. Polymer Coated Urea Impact on Barley Yield and Protein

Polymer coated urea (PCU) is an enhanced efficiency nitrogen (N) fertilizer shown to regulate N release over a season benefiting production and reducing nutrient pollution. The purpose of this study was testing the effect of uncoated and coated urea blends on irrigated barley yield and protein. The study consisted of three N rates applied as all urea or a 50-50 blend of PCU and urea. As expected, N rates increased yields and protein. In general, urea resulted in increased yields with... S. Fahning, T. Searle, A. Weigel, R. Buck, T. Hopkins, B. Hopkins

6. New Hydroponic System for Testing Mineral Nutrient Deficiencies and its Application to Quinoa

Correlating plant tissue nutrient concentrations with visual symptoms is valuable in combating mineral nutrient deficiencies and toxicities. Major crops tend to have large amounts of information regarding nutrient concentrations and visual symptoms of deficiencies, but this information is often lacking for minor crops, including quinoa (Chenopodium quinoa L.) Because nutrient concentrations can be easily controlled, hydroponics effectively demonstrate isolated specific nutrient related symptoms.... D. Cole, R. Woolley, R. Buck, B. Hopkins

7. Nutrient Lessons from Long-term Cropping System Studies

The long-term efficiency of applied nutrients in agricultural soils depends not only on the efficiency of use by the immediate crop, but also on the efficiency of use for residual forms. However, determining this efficiency is difficult due to the slow turnover of residual forms, large soil nutrient reserves, and multiple processes controlling the fate and crop utilization of nutrients. Long-term cropping system studies are useful in this regard because they allow small changes to accumulate and... E. Bremer

8. Nebraska Nitrogen Management Present and Future

University of Nebraska faculty have been refining their N rate recommendation procedure since the 1970s. At that time, they introduced a procedure for predicting soil nitrate-N availability and effect on subsequent corn N needs. In the 1990’s this procedure was refined based on 81 state wide N rate experiments. In 2003-2006 it was re-confirmed with 32 state wide irrigated corn trials. The current algorithm is the following: N need (lb/ac) = [35 + (1.2 x EY) - (8 x NO3- N ppm) - (0.14 x EY... C. Shapiro, R. Ferguson, C. Wortmann, T. Shaver, B. Krienke, G. Hergert, B. Maharjan

9. Application of Ion Exchange Resin Membranes to Nitrate Testing in the West

Resin membranes have been used since the 1960s to measure P supply from the soil. In the 1990’s the Plant Root Simulator (PRS®) probe was invented to further refine a method to measure N mineralization from soil organic matter. The functional measurement of soil N supply during incubation has been applied to both in situ measures and in lab research studies. Extending the PRS® measurements of N ‘intensity’ or flux to a meaningful number that a plant can utilize was accomplished... K. Greer, E. Bremer, T. Sievers

10. Influence of Dairy Manure Applications on Corn Nutrient Uptake

Corn silage is the predominant crop in Idaho used for recovering phosphorus (P) that has accumulated in soils from dairy manure applications. However, little is known about how much phosphorus and other nutrients are being recovered under Idaho conditions. The objective of the study is to estimate phosphorus removal by irrigated corn silage crops cultivated throughout Southern Idaho with variable soil test P concentrations, and to identify effects of increasing soil test P on potassium (K), calcium... A. Moore, B. Brown, J. Ippolito, S. Hines, M. De haro marti, C. Falen, M. Chahine, T. Fife, R. Norell

11. Delivery of Soil Science to Farmers Using Advanced Simulation Tools: a 10 Year Case Study

Technologies that aid in farm management and input application can increase profitability only if they readily show an advantage that the farmer can measure (Walton 2010). Western Ag Labs Ltd. (WAL) is a soil science laboratory which provides an educational soil service to producers of Western Canada using the PRSTM Technology. The service provides their customers access to advanced simulation tools that serves as a decision support system for Crop Nutrition Planning (CNP). The PRSTM technology... K. Greer, D. Wildfong, D. Hicks, E. Hammermeister

12. Phytosiderophore Exudation from the Roots of Iron Stressed Kentucky Bluegrass

Some Kentucky bluegrass (Poa pratensis L., KBG) cultivars are susceptible to iron (Fe) deficiency chlorosis when grown on calcareous soils and are routinely treated with Fe fertilizers. Aesthetics could be improved and this costly practice could potentially be eliminated with the use of cultivars resistant to Fe deficiency. Grasses are known to release phytosiderophore into the rhizosphere to dissolve Fe for plant use, and this characteristic has been used to screen for resistant... B. Hopkins, E. Buxton, V. Jolley, R. Christensen

13. Micro-nutrients in Alfalfa Production: is There Need/opportunity for Cost Effective Management?

The management of soil fertility for optimum alfalfa productivity requires that all nutrient-related limitations be manipulated where warranted and cost-effective. It has been the policy of the Utah State University Analytical Laboratory to not promote soil testing for micronutrient sufficiency based on a lack of general need, historically, for nutrients such as sulfur, boron, zinc and others. This study undertook to accomplish two things, 1) to provide an initial inventory of micronutrient... G. Cardon, J. Barnhill, M. Pace, C. Israelsen, D. Miner, L. Greenhalgh, S. Banks, M. Shao, D. Rothlisberger, S. Olsen, P. Hole

14. Economics of Fertilization Under Site-specific Management Zones

Site-specific management of crop fields using variable rate application of inputs to manage in-field variability has now been around for over 15 years. However, the degree to which site-specific management strategies increase farm profitability is not well established. The objectives of this study were: to compare uniform and variable-rate Nitrogen (N) management strategies across productivity level site-specific management zones and to identify the most profitable N management strategy. This... R. Khosla, D. Westfall, W. Frasier, B. Koch

15. Phosphorus and Zinc Interactions in Potato

Potato production requires high soil phosphorus (P) application with potential negative environmental and nutrient uptake effects. Impacts of high available P on species in potato cropping rotations are not adequately understood, nor have the causes of reduced yield and quality from excess P been fully explored. Antagonistic interactions with cationic micronutrients such as zinc (Zn) are plausible explanations. Two hydroponic experiments were conducted with Burbank potato to elucidate P and Zn... B. Webb, B. Hopkins, J. Ellsworth, S. Barben, B. Nichols, V. Jolley

16. Is Protein Enough for Assessing Wheat Flour Quality?

The quality of wheat products such as bread, bagels, noodles or pizza that consumers purchase is based on the flour quality used in production. Flours with different characteristcs are needed to produce different products and flour quality is important to produce a quality end product. However, at the initial stage of flour production, wheat is sold on a grain protein premium basis by farmers to elevators and eventually millers. In many years, higher protein (> 15% protein) wheat can bring... C. Reese, D. Clay, D. Beck, R. Englund

17. Soil Zinc Application for Southwestern Pecan

Pecan trees grown in the alkaline soils of the southwestern United States are prone to zinc deficiency unless supplemental zinc is regularly applied. Standard treatment involves multiple foliar zinc applications. Soil zinc application would provide several advantages. A field study was initiated in 2005 with three soil zinc treatments: no zinc (control), ZnSO4 (74 kg.ha-1 Zn), or ZnEDTA (19 kg.ha-1 Zn) were applied one time in March, 2005 in bands 18 cm deep and 1.2 m on both sides... J. Walworth, A. Pond, H. Nunez, B. Wood, M. Kilby

18. Remote Sensing of Corn N Status with Active Sensors

Determining in-season corn (Zea mays L.) nitrogen (N) variability has been a research focus of agronomists for quite some time. One of the methods currently available to determine N variability in corn is remote sensing. Studies have shown that remotely sensed imagery can detect N variability in corn. However, this method can have some limitations, such as the timeliness in which this imagery can be acquired. Hand-held active remote sensing devices may overcome these limitations.... D. Westfall, R. Khosla, T. Shaver

19. Development of a Constrained Resource Model to Support Intercropping Decisions

Crop producers are interested in intercropping due to its’ potential to increase profitability, yield stability and sustainability. Our objective was to extend a simulation model to forecast crop yields (PRS® CropCaster®) to pulse-oilseed intercrops.  This tool would provide crop producers with forecasts of yields of each crop component under different management and environmental conditions. Based on competition for fertilizer 15N... E. Bremer, I. Madsen, K. Greer

20. 4R Nitrogen Management Effects on Silage Corn Production

The 4R nutrient stewardship framework aims to improve fertilizer management through four core principles: right source, rate, time, and place. Nitrogen is one of the most important and costly inputs for silage corn production. Excessive or inefficient N applications rapidly decrease profits for growers and can cause environmental concerns. Nitrogen loss can occur through leaching, runoff, and denitrification. Most previous studies evaluating N management for silage corn have only examined one... B. Okorie, M. Yost, K. Deep, N. Howard

21. Banana Fiber as a Soil Amendment in Potato and Corn

Banana (Musa spp. L.) pseudostem fiber has unique properties that may prove helpful in plant and soil management, including a high water holding capacity. Increased capacity could be useful in water conservation efforts in areas experiencing long-term drought. In the agricultural space, banana fiber could be used to maintain soil moisture, thus lowering the frequency and/or amount of irrigation. The objectives of irrigated field studies in Provo, UT, USA were to measure the impact of... B. Hopkins, M.J. Foster, S.V. Nelson

22. Recovered Carbon Black from Pyrolyzed Tires as a Zinc Fertilizer for Field Corn in Calcareous Soils

Waste tires exist in immense quantities, representing a substantial pollution source containing a variety of environmentally concerning components, including the heavy metal zinc (Zn) added as Zn oxide (ZnO) during tire manufacture. Pyrolysis under high vacuum is a potential disposal solution. One of the by-products of this process is recovered Carbon Black (CB) that is enriched in Zn, an essential plant nutrient. Our objective was to determine if recovered CB from can serve as a fertilizer Zn... R.E. Sannar, E. Bremer, K. Greer, B. Hopkins