Contribution of phosphorus and nitrogen in improving productivity of upland rice in acidic soil
1999
Reoma, V. | Kondo, M. | George, T. | Aragones, D.V. | Morales, N.D. | Manalo, L.L. (International Rice Research Inst., MCPO Box 3127, Makati City 1271 (Philippines))
Soil management practices are specific to a particular soil. The use of appropriate fertilizers in combination with other cultural management approaches is necessary to achieve stable and higher yields. In acidic uplands, the combination of appropriate fertilizer inputs and suitable soil conditions plays a vital role in successful upland rice production. A field study was conducted to evaluate the effect of P and N and their combination on yield and yield-determining processes in acidic soil in Matalom, Southern Leyte [Philippines]. The study aimed to determine potential yield with minimum nutrient (P and N) stress. N was applied as urea (55 and 110 kg N/ha) in eight split applications and as controlled release urea (110 kg N/ha) in basal band application. Phosphorus was applied as single super phosphate in basal (50 kg/ha). Improved upland variety IRAT 216 was used. Yield and total dry weight were substantially increased by P. P also increased harvest index which is associated with higher spikelet number per panicle and panicle number. The increase in yield and total DW [dry weight] due to N was higher with P than without P. Grain filling rates were low partly because of high sterility in all treatments. The use of controlled release urea resulted in comparable or higher yield as that of urea splits. The average yield in 2 years was 1.0 t/ha without P and N, 1.6 t/ha with P, and 2.0 t/ha with P and controlled release urea. These results indicated the potential benefit by the input of P and N in acidic uplands
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