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Influence of Large Amounts of Nitrogen on Nonirrigated and Irrigated Soybean

^a Research Geneticist
^b Research Agronomist
^c Research Physiologist, USDA-ARS, Crop Genetics and Production Research Unit, P.O. Box 345, Stoneville, MS (662-686-3036).

View larger version (37K): [in a new window]   Fig. 1. One-to-one graph of aboveground biomass (g m–2) for soybean in the ZeroN treatment (x axis) plotted against aboveground biomass in the PlusN treatment (y axis) across all management practices (years, cultivars, herbicide, and Mn treatments) and irrigation environments (irrigated and nonirrigated). Two biomass samples (54 days after planting [DAP] and approximately R6) were taken in 2002 and one biomass sample was taken at approximately R5 in 2003 and in 2004. The data points represent 46 paired (ZeroN vs. PlusN) samples (i.e., 92 observations with four replications each).

View larger version (37K): [in a new window]   Fig. 2. One-to-one graph of Biomass N (g N m–2) in the ZeroN treatment (x axis) plotted against Biomass N in the PlusN treatment (y axis) across all management practices (years, cultivars, herbicide, and Mn treatments) and irrigation environments (irrigated and nonirrigated). Biomass N was calculated from the N concentration (%N) and the aboveground biomass (g m–2). The data points represent 46 paired (ZeroN vs. PlusN) samples (i.e., 92 observations with four replications each).

View larger version (36K): [in a new window]   Fig. 3. One-to-one graph of seed yield (kg ha–1) in the ZeroN treatment (x axis) plotted against seed yield in the PlusN treatment (y axis) across all management practices (years, cultivars, herbicide, and Mn treatments) and irrigation environments (irrigated and nonirrigated). The data points represent 35 paired (ZeroN vs. PlusN) samples (i.e., 70 observations with four replications each).

View larger version (40K): [in a new window]   Fig. 4. One-to-one graph of the number of seed per square meter in the ZeroN treatment (x axis) plotted against the number of seed per square meter in the PlusN treatment (y axis) across all management practices (years, cultivars, herbicide, and Mn treatments) and irrigation environments (irrigated and nonirrigated). The data points represent 35 paired (ZeroN vs. PlusN) samples (i.e., 70 observations with four replications each).