Proceedings
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| Filter results4 paper(s) found. |
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1. Determining Cropping System and Topsoil Depth Effects on Phosphorus and Potassium Nutrient DynamicsUnderstanding the effects of fertilizer addition and crop removal on long-term change in soil test phosphorus (STP) and soil test potassium (STK) is crucial for maximizing the use of grower inputs on claypan soils. Due to variable topsoil depth, nutrient supply from subsoils, and crop removal across fields, accurate P and K fertilizer management can be challenging. Current Missouri fertilizer recommendations rely on a single buffering capacity for all soils throughout the state for P, and are only... |
2. Correlation and Calibratin of the SMP Lime Requirement Test with Direct Titration of Soil AcidityThe SMP Buffer method (Shoemaker, et al, 1961) of routinely determining lime requirement on soil samples has been used at the University of Kentucky Soil Testing Laboratory (UKSTL) since the mid-1960's. Initial correlation and calibration for Kentucky soils was a result of incubating several soil samples over a period of time after mixing different rates of lime with them (D.E. Peaslee, 1975, personal communication). During the ensuing years, county agricultural extension agents have raised many... |
3. Revamping Nitrogen Fertilizer Recommendations for MissouriMultiple nitrogen fertilizer rate decision tools have been developed over the years for recommending nitrogen to growers. These tools are based on mass balance equations with expected yield and yield goal, economically optimum nitrogen rate, preplant soil nitrate test, pre-sidedress and late spring soil nitrate test, plant tissue nitrogen, crop growth models, and canopy reflectance sensing. These tools rarely include biological nitrogen in the rate recommendations. Advances in soil health assessment... G. Singh , J.A. Lory, K.A. Nelson, M. Davis, L. Abendroth, G. Kaur, J. Calhoun, J. Chlapecka |
4. Corn Grain Yield Response to Nitrogen Rate Timing, Source, and Nitrification Inhibitor in MissouriNitrogen response depends on several factors including weather conditions, soil N supply capacity, previous crop in rotation, plant population, and fertilizer management practices. Fertilizer management practices include fertilizer rate, source, application timing, placement, and use of nitrogen stabilizer. In Missouri, the nitrogen fertilizer rate recommendations for corn are based on the yield goal equation. This equation includes the target plant population, pounds of nitrogen removed per thousand... G. Singh , K. Nelson, G. Kaur , J. Lory, M. Davis, L. Abendroth, H. Naumann, J. Calhoun, J. Chlapecka, W. Bradley, C.J. Ransom, R. Carson, P. Pal |