Evaluation of Urease Inhibitors in Reducing Ammonia Volatilization and Increasing Grain Yield in Drill-Seeded, Delayed-Flood Rice (original) (raw)

Abstract

Urea is the most commonly used nitrogen (N) source in Arkansas rice production. Losses as ammonia can occur if fields are not flooded in a timely manner. If a flood cannot be established in a timely manner, a urease inhibitor is recommended. Recently, research has reported that relative humidity (RH) below the critical relative humidity (CRH) of urea can limit volatilization. The objectives of this study were to investigate the effectiveness of the urease inhibitor NBPT (N-(n-butyl) thiophosphorictriamide) at inhibiting ammonia volatilization, increasing grain yield, and to evaluate in-chamber RH as compared to in-field conditions. Untreated urea, Agrotain-treated urea, and Arborite-treated urea were investigated as to their influence on ammonia volatilization and rice grain yield. Ammonia volatilization data were collected using semi-open static chambers with an acid trap during a 20-d period. Dataloggers were included in-chamber and adjacent to chambers to measure temperature, RH,...

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