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1. Phosphorus Fertilizer Management and Cover Crop Effects on Phosphorus Loss from No-till Corn and Soybean.Loss of phosphorus from non-point source agricultural sources is a known contributor to the degradation and contamination of surface waters. Therefore, it is imperative to adapt agricultural best management practices which promote and preserve surface water quality. The goal of this study was to quantify the impacts of phosphorus fertilizer management practice (placement and timing) and winter cover crop on concentrations of total suspended solids, total phosphorus, and dissolved reactive phosphorus... E. Carver, N. Nelson, K. Roozeboom, G. Kluitenberg, P. Tomlinson, J. Williams |
2. Nitrogen and Sulfur Colimitation to Winter Wheat YieldSulfur has become more limiting for wheat production in the Great Plains, and its deficiency can interact with N availability. The current work reports on yield and yield gaps of three winter wheat varieties as affected by N and S fertilization using the concept of co-limitation (CNS). Field studies evaluating 0, 10, 20 and 40 lbs S/a combined factorials with 50, 100, and 150 lbs N/ac and three hard red winter wheat varieties were conducted in eight environments resulting from the... R. Lollato, B.R. Jaenich, N. Nelson, M. Guttieri, D. Ruiz diaz, V. Sadras |