Effect of organic manure on yield and nutrient uptake under rice - rice cropping system

摘要

A field experiment was conducted during winter (rabi) 1996 and rainy (khaif) 1997 seasons to study the effect of organic manure on the yield and nutrient uptake under rice (Oryza saliva L.) - rice cropping system. Among the eight manures tested, application of farmyard manure (10 t ha~(-1)) in combination with neemcake (3 t ha~(-1)) has been found to be equally effective for getting higher grain yield and improved nutrient uptake, when compared to chemical N fertilizer application. Total nutrient uptake by rice crop differed significantly due to organic-manure applied treatments and application of farmyard manure + neemcake resulted in higher uptake (102.06 kg ha~(-1)), which was 20.7 percent more compared to chemical N fertilizer applied plot. The maximum N use efficiency (27.51 kg grain kg~(-1) N) was recorded in the same treatment, which was followed by farmyard manure combined with poultry manure; and press mud combined with poultry manure. Similar higher Apparent N recovery patterns also were recorded by organic manure treatments. Organic manures exhibited 22.7 percent and 21.5 percent higher total P and K uptake respectively in both the seasons of study when compared to chemical N fertilizer applied treatments. The significant increase ingrain yield was supported by higher number of panicle bearing tillers, straight ear heads and 1000-grain weight, which was observed more in organic manure applied plot as compared to inorganic fertilizer.