Nitrogen management strategies for direct seeded aerobic rice (Oryza sativa L.) grown in mollisols of Uttrakhand (India)
Publication Date : 05/08/2015
A field experiment was conducted during the rainy (Kharif) season in 2013 and 2014 at N.E. Borlaug Crop Research Centre of G.B. Pant University of Agriculture & Technology, Pantnagar (Uttarakhand) India to study nitrogen management in direct seeded aerobic rice(cv. Pant Dhan 16). The experiment consisted of three nitrogen level (90,120 and 150 kg ha-1) in main-plots with the seven set of nitrogen scheduling in sub-plots in a split plot design with three replications. The result on the basis of pooled analysis revealed that growth and yield attributes viz. number of shoots, 1000 grain weight, number of grain / panicle, grain and straw yield were higher in the treatment receiving 150 kg N ha-1(N3). Comparing to variable nitrogen scheduling these yield attributing characters were significantly higher when N was applied in 4 splits (□(1/4) basal + □(1/4) at active tillering+ □(1/4) panicle initiation +□(1/4) at flowering) under Tarai conditions recorded the maximum growth and yield attributes as well as grain yield (4778 kg ha-1). The nutrient NPK uptake were also higher under treatment receiving 150 kg N ha-1 and nitrogen scheduling N in 4 splits (□(1/4) basal + □(1/4) at active tillering+ □(1/4) panicle initiation +□(1/4) at flowering. Net return (Rs.38848), and B:C ratio (1.59) were recorded higher with 150 kg N ha-1applied whereas, nitrogen scheduling N in 4 splits(□(1/4) basal + □(1/4) at active tillering+ □(1/4) panicle initiation +□(1/4) at flowering) gave the highest net return (Rs.40878), and B:C ratio (1.69) followed by N in 3 splits (□(1/4) basal + □(1/2) active tillering + □(1/4) panicle initiation).
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