Effect of graded nutrient levels on yield, economics, nutrient uptake and postharvest soil available nutrient status of aerobic rice

A field experiment was conducted at the dryland farm of SV Agricultural College, Tirupati during Kharif 2011 and 2012 to identify the optimum nutrient requirement of aerobic rice. The experiment was laid out in a randomized block design replicated four times with five treatments viz N₁ (75% recommended dose of nutrients), N₂ (100% recommended dose of nutrients), N₃ (125% recommended dose of nutrients), N₄ (150% recommended dose of nutrients) and N₅ (175% recommended dose of nutrients). Among all the treatments N₅ resulted in the highest yield, economic returns, N, P and K uptake and postharvest available nutrient status of soil. But it was comparable with N₄ and all of them were at their lowest with N₁.