Total Nutrient Uptake and Partition in Mid-South Irrigated Soybean.

Total nutrient uptake and partitioning patterns in soybean [Glycine max (L.) Merr.] is fundamental to understanding the nutrient requirements of the crop. Technological advances and improved management strategies in soybean production systems have contributed to significant yield increases. Research was established in 2016 in Stoneville, MS to evaluate soybean nutrient uptake and partition across multiple soybean varieties. Soybean varieties evaluated were Asgrow 47X6, Asgrow 4632, Dynagrow 4934, and University of Arkansas 5014 (conventional release). Studies were established on a silt loam, a common coarse textured soil cropped in Mississippi under furrow irrigation. Soybean total aboveground biomass was collected at multiple growth stages including: V4, R2, R5.5, R6.5, and R8.0. At reproductive stages R5.5 – R8.0 soybean aboveground biomass was partitioned into senesced leaves, pods, and seeds. All biomass components were analyzed for nutrient content across primary macronutrients, secondary macronutrients, and micronutrients. Preliminary results for total N, P, K uptake across varieties to exceed 336 kg ha^-1, 41.5 kg ha^-1, and 308 kg ha^-1 respectively. Across varieties, total N, P, K partitioned into the seed was approximately 207 kg ha^-1, 17.5 kg ha^-1, and 64.5 kg ha^-1 at physiological maturity.