Vol. 16 No. 2
Effect of nitrogen levels on yield and nutrient uptake of kharif rice (Oryza sativa L.) under different establishment methods
Author(s): C. RAMULU, P. R. R. REDDY AND E. NARSAIAH
Abstract: A research experiment was conducted on rice during kharif-2015,2016 and 2017 at Regional Agricultural Research Station, Warangal (Telangana) under different establishment methods (machine transplanting, conventional transplanting, drum seeding and broadcasting) with three nitrogen levels (120,160 and 200 kg ha-1) to evaluate suitable establishment method to ensure timely planting with optimum age of seedlings with matching quantity of nitrogen requirement to rice crop to enhance grain production. The results indicated that machine transplanting found significantly higher grain yield(5345 kg ha-1), straw yield(6305 kg ha-1) and total N, P, K uptake of 121, 21.91, 104 kg ha-1, respectively over other establishment methods. Among different nitrogen levels 160 kg N ha-1 recorded significantly higher grain yield (4838 kg ha-1), straw yield(6109 kg ha-1) and total N, P, K uptake of 121, 20.09, 98 kg ha-1, respectively over 120 and 200 kg N ha-1. The grain yield, straw yield, total N, P, K and micronutrients uptake (Zn, Cu, Fe and Mn) were found higher by machine transplanting combined with 160 kg N ha-1 over rest of establishment methods with nitrogen levels. The net income (Rs.64, 587) as well as B:C ratio (3.1:1) was maximum with machine transplanting closely followed by broadcasting (1:3.0).
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