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1. Optimizing Irrigation and Fertilizer Management in Cotton to Increase Nitrogen Use EfficiencyNitrogen (N) fertilizer is an important nutrient in cotton production, and if the optimal amount is not applied yield penalty may occur (Hutmacher et al. 2004). A more efficient application of N fertilizer based on plant N requirements, soil texture, and N availability can increase cotton yield and N-use efficiency (NUE). The main objective of this research was to determine the relationship between cotton lint yield and normalized difference vegetation index (NDVI) across multiple irrigation levels,... A. Bumguardner, T. Wheeler, K. Lewis |
2. Relationship Between Plant Nitrogen and NDVI of Cotton on the Texas High PlainsNitrogen (N) is one of the most limiting factors in Texas High Plains cotton production (Bronson et al., 2001). Nitrogen build-up in cotton is near maximum for the season at first open boll, when leaf senescence begins (Li et al., 2001). Lint yield response to N is difficult to predict due to N response relying on water management and initial soil nitrate (NO3--N) (Morrow and Krieg, 1990). Normalized difference vegetative index (NDVI) is a tool that has been used to manage... A. Bumguardner, K. Lewis, G. Ritchie, K. Bronson, M. Maeda |
3. Soil Phosphorus Forms and Cycling Are Altered by Acidification from Nitrogen Fertilization in Long-term Wheat Plots in Swift Current, SaskatchewanSoil acidification from high rates of nitrogen (N) fertilization is recognized as a significant problem in many countries, altering many aspects of soil health. However, new research suggests that this is also a problem for soils receiving lower rates of ammonium-N (NH4-N) over long time periods, including on the North American Great Plains. Soil phosphorus (P) cycling is particularly vulnerable to acidification, because P is optimally soluble in soils within a limited pH range. This... B. Cade-menun, L. Bainard |
4. Acid Soil Adaptation Management in Western North Dakota with Hard Red Spring WheatHard Red Spring Wheat (HRSW) yields are decreasing due to acidic soils. No-till practices paired with heavy N use have lowered the soil pH on many acres of the Northern Great Plains. Acid soil where the pH drops below 5.5 has an impact on nutrient availability, soil microbial activity, stunted roots from aluminum (Al) toxicity and other plant/soil interactions. These areas can be improved from surface liming; however, liming can be costly. For many producers facing this issue, especially those... R. Buetow |
5. Water Use Efficiency and Soil Changes After Long-term Crop Rotation Under Limited IrrigationLong-term crop rotation intensity and diversity can affect key soil properties. In semi-arid regions, the combined factors of rotation and soil properties may also affect the overall water use efficiency from either limited irrigation or rainfall. The objective of this study was to evaluate changes in soil properties, and water use efficiency of corn grown under different rotation intensity and diversity and limited/supplemental irrigation. A field experiment was conducted over seven years in... D. Ruiz diaz, P. Garcia helguera, A. Rosa, O. Brian, K. Roozeboom |
6. Cover Crop Termination Timing Effects on Soil and Cotton Nutrient AvailabilityCover crop termination timings can have large impacts on the amount of soil coverage, nutrient availability, and stored soil moisture in a system. Producers in semi-arid regions must gamble the possibility of increased soil infiltration and reduced soil water evaporation against the potential of decreased soil moisture; in the SHP, success is dependent on irrigation capacity and precipitation. Optimizing termination timings for semi-arid regions and in deficit-irrigation/dryland systems is critical... C. Cobos, G. Baath, J. Burke, S. Chatterjee, P. Delaune, K. Lewis |