Evaluation of Experimental PCU Vs Urea + NBPT for Delay-Flooded Rice Production.

EVALUATION OF EXPERIMENTAL PCU VS NBPT-TREATED UREA FOR DELAY-FLOODED RICE PRODUCTION R. Turner, B.R. Golden, J.A. Bond, J. Gore, T. Irby Field studies were conducted in 2015 and 2016 in Stoneville, MS, to evaluated rice response to N sources, application timing and N rate. Studies were conducted on soils with CEC ? 22 and CEC ? 25 that are commonly used for rice production in Mississippi. The primary objective of this research was to compare EXP-PCU to Agrotain coated urea (urea + NBPT) the more standard pre-flood N source common to the Mid-South. Treatments were arranged in a in a 2 x 2 x 2 factorial treatment structure and include; N application timings (10-14 days before permanent flood (DBF) and 3-5 DBF), x N source (urea + NBPT and EXP-PCU), and x N rate (168 kg N ha-1 and 202 kg N ha-1). Data was collected to determine net N-uptake at HDG and net rice grain yield. After two years of data net N uptake significantly responded using an ? 0.10 to main effect N source and two-way interaction of application time x N rate. Net grain yield significantly interacted to N source, N rate, and application timing.