Proceedings
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| Filter results7 paper(s) found. |
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1. Fall Nitrogen for Winter Wheat Production?Fall nitrogen (N) applications are typically not recommended in Kentucky unless previous corn yields exceed 30 bu/A more than expected or when wheat is planted later than optimal in combination with a wet fall. In 2016, much of Kentucky experienced this combination of yield and environmental conditions. A study was initiated to test the need for fall applied N and how much fall N may be needed. Wheat was planted at recommended (normal) dates and then at dates that would be considered later than... E. Ritchey, J. Grove |
2. Strip Tillage and No Tillage Fertilization Systems Evaluated for Eastern Kansas Rain Fed CornRow-crop agriculture in East-Central and Southeast Kansas is facing increasing pressure to reduce sediment and nutrient losses via runoff. Edge-of-field measurements show that no-tillage with fertilizers placed below the surface of the soil has significantly less sediment and total P losses in runoff compared to conventional tillage (Janssen et al., 2000). However, for rain-fed corn, no-tillage in these regions can provide serious challenges some years because of frequent spring rains and an abundance... |
3. Corn and Soybean Grain Yield and Concentration of Potassium in Plant Tissues and Soil as Affected by Potassium FertilizationResearch in the Midwest has shown that K fer tilization tends to increase plant K uptake by corn and soybean and the K concentration of vegeta tive tissues. Several studies found that K fertilization usually increases the K concentrati on of vegetative plant parts, often regardless of the soil-test K (STK) level a nd grain yield response (Malla rino et al., 1999; Borges and Mallarino, 2000; Yin and Vyn, 2002a, 2002b; Borg es and Mallarino, 2003; Yin and Vyn, 2003). It is well known that the K concentration... |
4. Crop P Nutrition and the Three Pillars of Soil Health: Less Soil Disturbance, Greater Crop Diversity, Organic Nutrient SourcesThe soil health initiative is built around a number of principles, but three central components are reduced soil disturbance, especially no-tillage; increased crop diversity, especially cover crops; and greater use of organic materials (manures, composts, etc.) as nutrient sources. Reduced tillage intensity causes temperate soil environment changes such that oxidation of organic matter is slowed and phosphorus (P) stratification is reinforced. Cover crop insertion heightens P cycling, generally... J. Grove |
5. N, S and Micronutrient (B + Zn) Interactions in Soft Red Winter Wheat NutritionThis work is intended to answer certain questions that result from the implementation of a multi-element wheat nutrition program. Nitrogen rate is a fundamental driver of wheat yield and quality. However, the impact/value of S or the micronutrients, which are likely components of a more integrated wheat nutrient management program, is not clear.The main study design included 4 rates of N (40, 80, 120 and 160 lb N/acre), 2 rates of S (0 and 10 lb S/acre), and 2 rates of the micronutrient ‘package’... J. Grove, E. Ritchey, J. Shockley |
6. The Alfalfa Yield Plateau: is Soil Fertility the Cause?Alfalfa is a perennial forage legume known for its ability to produce high quality hay, earning it the title the “Queen of Forages.” It is produced across the United States as feed for the beef, dairy, and equine industries. During the 1950s, alfalfa yields rose exponentially due to advances in technologies such as improved varieties, synthetic fertilizers, and pesticides. However, yields plateaued at approximately 3.3 tons per acre in the 1980s for reasons not fully understood and... W. Fleming, E. Ritchey, C. Teutsch, J. Grove |
7. Updating Nitrogen, Phosphate and Potash Rate Recommendations (AGR-1) for Kentucky Grain GrowersFor UK soil test lab users, soil test phosphorus (P) and potassium (K) have been slowly declining for several decades, suggesting recommended ‘maintenance’ rates (initiated in 1992) were insufficient. Adjusting for modern grain P and K concentrations and increasing yield-driven nutrient removal, we raised corn, soybean and wheat maintenance rates by 10 to 20 lb P2O5 and 10 to 30 lb K2O per acre, depending on the individual crop. Corn nitrogen (N) rate recommendations had not been... J. Grove, E. Ritchey |