Effects of irrigation and nitrogen fertilization on nitrogen uptake and nitrogen use efficiency of wheat on a clay terrace soil of Bangladesh
2000
Rahman, M.A. (Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture) | Karim, A.J.M.S. | Solaiman, A.R.M. | Egashira, K.
A field research was conducted at the university farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh, during November 1997 to March 1998 in order to study the effects of irrigation and nitrogen fertilization on the uptake of nitrogen and nitrogen use efficiency of wheat. The experiment was executed in the split-plot design comprising the combination of the five levels of irrigation arranged as a main plot and the four rates of N application distributed to a sub-plot. The treatments for the study were the same as before. Both irrigation and N application have created a significant impact on N content, N uptake, and N use efficiency in wheat. The N content and N uptake of wheat were increased significantly by providing two to three irrigations having irrigation at the grain filling stage (80 days after sowing). Nitrogen application up to 120kg ha sup(-1) also increased the N content and N uptake of wheat. The N content in wheat grain was found to be highly correlated with the leaf N content at the different growth stages. A negative relationship existed between N use efficiency of wheat and the rate of N application.
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