Potassium fertilizer management for rainfed lowland rice in Central Java, Indonesia
1995
Mamaril, C.P. | Wiharjaha, A. | Wurijandari, D. | Suprapto (Cooperative DEPAGRI-IRRI Program, P.O. Box 205, Bogor 16002 (Indonesia))
A long term experiment was conducted on an aeric Tropagualf, fine mixed isohyperthermic silt loam soil and relatively low fertility to determine appropriate frequency of K application to rice and soybean and to evaluate the effect of crop residue incorporation on K needs. The cropping sequence followed consisted of direct seeded rice (DSR) on dry soil followed by transplanted rice (TPR) on minimim tilled soil then soybean (SYB). Recommended K rate (90 kg K2O/ha) was either split, one half applied to one crop in the sequence and the remaining half to the other crops or the recommended rate is applied to each crop. Half of the plots received crop residue (+CRR) and the other half without crop residue (-CRR). Response to applied K was observed in all crops every season. Greater relative response to applied K was observed on TPR with or without crop residue applied than on DSR. Moreover, grain yield of TPR was similar whether half or the full recommended rate of K was applied to the crop. This was true on the DSR but only with -CRR. Greater relative response to K was observed in SYB with + CRR than with -CRR. Generally, the yields of all three crops were higher with +CRR than with -CRR but has not necessarily improved the effectiveness and efficient use of applied K
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