Response of Transplanted Rice to Levels, Splits and Timing of NPK application:Effect on Uptake and Use Efficiencies of P and K

The effect of levels, splits and timings of NPK application on losses, uptake and use efficiency of P and K in transplanted rice (Oryza sativa L) was studied at Agricultural Research Station, Gangavathi, Karnataka, during kharif 2000 and summer 2001. A higher level of NPK application (L₂) was beneficial which increased both P and K uptake resulting in higher yields. Application of split doses of either N or NPK did not influence P and K uptake and grain yield. Though the yields were higher with L₂, their agronomic efficiency decreased over L1. The agronomic efficiency of P and K were unaffected by N / NPK splits with BPT-5204 (kharif) but NPK splits significantly increased the AE of both P and K over only N splits with IR-64 (rabi/ summer). Though the recovery of P was not influenced by its level, its extended application increased P recovery. However, in case of K, both increased levels and extended levels of K increased K recovery.