Yield and nitrogen nutrition of modern rice as affected by nitrogen fertilization under irrigated culture [in Bangladesh]
1991
Choudhury, A.T.M.A. | Bhuiyan, N.I.
A field experiment was conducted during 1990 dry season (Boro season) to study the effect of four rates of N fertilization on the yield performance and nitrogen nutrition of three modern rice varieties and a promising line, varying in tillering habit, plant height and growth duration under irrigated culture. The experiment was laid out in a split-plot design with variety/line as the main plot and nitrogen rate as the sub-plot, replicated thrice. Grain yield of BR1 and BR14 increased significantly up to 120 kg N/ha. But in case of BR3, yield increase was significant up to 80 kg N/ha and for BR802-118-3-1, N application at 120 kg/ha only significantly increased the grain yield over the control. Agronomic efficiency of added N was higher in short statured BR1 and BR3 than the tall statured BR14 and BR802-118-3-1. Grain yield N(o) was the highest in BR802-118-3-1 followed by BR14, and lowest in BR1. Nitrogen recovery was also higher in short statured varieties than the tall ones irrespective of their growth duration. The promising line BR802-118-3-1 and the variety BR14 may be economically advantageous over the short statures ones.
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