Effects of Rates and Timings of Organic Fertilizer Application on growth and Yield of Rice

Abstract

Three organic fertilizers, chicken manure (300, 600, 1200 kg/rai), cow manure (700, 1500, 3000 kg/rai) and rice straw compost (1000 , 2000, 4000 kg/rai) were applied on 1, 7 and 14 days before rice transplanting. These organic fertilizers were compared with chemical fertilizer (8-4-0 kg P-P2O5 -K2O/rai) for increasing the yield of RD23 and KDML 105 rice varieties, The experiment was conducted at Phitsanulok Rice Research Center, Chainat Rice Experiment Station and Khok Samrong Rice Experiment Station during 1987-1990. The results showed that chicken manure at the rates of 600-1200 kg/rai iand 300-600 kg/rai significantly increased RD23 and KDFML 105 rice yield, respectively. Application of cow manure at 1500-3000 kg/rai and rice straw compost at 2000-4000 kg/rai significantly increaed yield of both rice varieties. Organic fertilizer applicaton at 1, 7 and 14 days before transplanting produced rice yields that were not significantly different among each other, but organic tertilizer application at 7 and 14 dyas before transplanting tended to give higher yield than than that of 1 day before transplanting.