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| Filter results9 paper(s) found. |
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1. Combining Nitrification Inhibitor TechnologiesTechniques exist for the partial control of nitrification, but few studies have determined the effectiveness of combining more than one technique. A series of experiments compared the nitrification rate of urea granules as influenced by granule size (0.01, 0.1, and 1.0 g/pellet) and dicyandiamide (DCD) addition (0, 1, 2, 5, and 10% of N) . A second series of experiments measured the interactive effects of DCD and ammonium thiosulfate (ATS) on nitrification of liquid fertilizers. Both experiments... |
2. In Search of EAN of Spring WheatMany spring wheat varieties respond reliably to enhanced ammoniunl nutrition (EAN) in the greenhouse. Three field studies were established in 1992 to determine if similar responses could be obtained in the field. Butte 86 spring wheat was fertilized (100 Ib N/A) with calcium nitrate, urea, urea + DCD, forestry-grade (0.1 g) urea pellets and forestry-grade urea pellets + DCD. The goal was to provide wheat with a large range of a1nmonium:nitrate ratios and to determine the effect 011 wheat development... |
3. Calcium Chloride Effects on Nitrogen Uptake by Small GrainsApplying calcium chloride (CaC12) with urea stimulated nitrogen uptake by small grains in six greenhouse studies. The effect was most dramatic for a sandy soil, moderate for a loam soil, and not observed for a clay soil. Allowing the urea to nitrify before plant uptake negated the CaC12 effect. In field studies, these effects were generally not observed, probably because the nitrification of the applied N was too rapid. However, this concept deserves further investigation, for example, when established... |
4. Soil and Site Factors Responsible for Yield Variations in Two Southern Illinois Farm FieldsYield variability within a field is largely influenced by the soil physical. chemical. and topographic features of that field. On-farm field research studies were conducted from 1997 through 1999 on two southern Illinois farm fields (one in Jefferson County and the other in Pope County) with varying soil physical, chemical, and topographic features to determine which factors most influenced crop yield variability. Each location was GPS-gridded utilizing a grid cell size of 0.45 acres. Detailed topographic... |
5. The Influence of Variably Applied Potassium Fertilizer on Yield Variations in Two Southern Illinois Farm FieldsThe basis of Variable Rate Technology (VRT) is to apply nutrients where they are needed and to reduce the application of nutrients where they are not needed. However, there is considerable uncertainty as to whether the variable application of nutrients to farmers fields should be on the basis of soil test levels or yield potentials. A field study was conducted at two locations in southern Illinois from 1997 to 1999 to evaluate VRT as a management tool for corn and soybean production on fields with... |
6. Assessment Of Enhanced Efficiency Urea Products On Maize In MissouriUrea is the most commonly used N fertilizer worldwide, but can be easily lost to the environment through ammonia volatilization. Enhanced efficiency fertilizers (EEF) have been developed to help prevent these losses. Field studies were conducted from 2009 to 2011 on a Mexico silt loam (fine, smectitic, mesic, Vertic Epiaqualf) to determine the efficacy of five EEF urea products compare to untreated urea when surface applied to no-till maize (Zea mays L.). Treatments included untreated urea, Agrotain,... |
7. Nutrient Reduction StrategiesThe Hypoxia Task Force (HTF) 2008 Action Plan set a goal or reducing the nitrogen and phosphorus load reaching the Gulf by 45% in order to reduce the size of the hypoxic zone to 5,000 km 2. Each of the 12 states along the main stem of the Mississippi and Ohio rivers were to develop a state specific strategy by 2013 to achieve the goal by 2015. These plans have been developed and work is underway to implement the strategies, but the time line was not realistic. In February 2015, the HTF announced... |
8. Investigating Soybean Response to Phosphorus with a Cover Crop and Fertilizer Combination in KansasThe soybean crop provides one of the best opportunities to include a cool season cover crop (CC) ahead of planting. This study aims to maximize phosphorus (P) use efficiency by the soybean crop by using CC planting as a window of opportunity for better P fertilizer placement and timing. Specifically, combining P fertilizer with cereal CC seeds will place the fertilizer below the soil surface and combine two operations (CC planting and fertilizer application) in one pass. Other benefits include... J. Demarco, D. Ruiz diaz |
9. Soybean Response to Phosphorus Fertilizer and Cover Crop Combination in KansasPhosphorus (P) plays a critical role in supporting plant growth and maximizing crop yields, but its availability is often limited in agricultural soils. Cover crops (CC), widely used to improve soil health, can also influence nutrient availability and moisture dynamics. This study investigates the effects of P fertilization and CC on soybean P uptake, soil moisture, and grain yield in Kansas. Field trials were conducted across multiple sites in 2022 and 2023, using a randomized complete block... J. Demarco, D. Ruiz diaz |