Rice Yield and Plant Tissue Analysis to Nitrogen Additions.

Rice Yield and Plant Tissue Analysis to Nitrogen Additions
R. Turner, B.R. Golden, J.A. Bond, J. Gore, T. Irby

Rice (Oryza sativa L.) is a crop predominantly grown in the Mid-South. Current Mississippi State recommendations for N in rice production is a single application of 168 kg of total N/ha on sandy soils and 201.6 kg of N/ha-1 on its clay soils. Our primary objective was to evaluate plant tissue concentrations and increase grain yield to N fertilization. Secondary objectives were composed of the proper application timing, N source and rate. Research will be established at the Delta Research and Extension Center, near Stoneville, MS on both sandy loam and clay soils, all experimental design was a split-plot. N sources being used are environmentally smart nitrogen (ESN), Ammonium sulfate, Diammonium Phosphate (DAP), Agrotain treated urea, and urea. Timings were established at planting, 2-leaf growth stage, 7 days before flood, and midseason with rates ranging from 0-134.4 kg/ha-1, plus an untreated check.