Abstract
AbstractField studies were conducted on a Crowley silt loam (Typic Albaqualf) to investigate the influence of split applications, subsurface placement, and the nitrification inhibitor (DCD) dicyandiamide (cyanoguanidine) on the plant uptake of 15N‐labeled urea by dry‐seeded rice (Oryza sativa L. ‘Newbonnet’). Fertilizer N topdressed in three split applications (TD3SA) resulted in the highest rice grain yields and highest percent recovery of fertilizer N in the rice plant. Fertilizer N applied all preplant with DCD resulted in slightly less grain yield, but similar total dry matter yield, total N uptake and fertilizer N recovery in the soil‐plant system as the TD3SA method. Fertilizer N applied all preplant without DCD was inferior to the other treatments. Subsurface preplant incorporation (SSPPI) of N resulted in greater fertilizer N uptake by the rice plant compared to broadcast preplant incorporation (BCPPI); but, this did not translate into more total N utilized or grain produced. It appeared that DCD, by maintaining more of the fertilizer N as NH4‐N, caused less fertilizer N to be lost via denitrification after flooding and may have enabled more of the fertilizer N to participate in the mineralization‐immobilization turnover cycle and exchange for soil N. Overall, DCD increased the uptake and yield effectiveness of preplant N in dry‐seeded rice cultivation.
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