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- W267317008 abstract "In order to increase rice yield and N use efficiency and protect ecological environment,two field experiments were conducted to examine effects of the specially designed controlled release urea on rice yields and N use efficiency in Sichuan.Results showed that controlled release urea significantly enhanced rice yield and N fertilizer use efficiency.The rice yield in soil with middle and high fertility was increased by 3943.0kg/hm2(50.78 %) by controlled release urea compared with no N treatment and was increased by 1062.0kg/hm2 (9.97 %) by controlled release urea than that by the regular urea treatment.The rice yield in soil with middle and low fertility was increased by 2647.7 kg/hm2(43.15 %)by controlled release urea and was increased by 1868 kg/hm2 (27.01 %)by controlled release urea than that by the regular urea treatment.The effect of fractionated application of urea was better than that of once application of urea for the rice yield that could be increased by 2 %-10 %.In the range from 90 to 150 kg N/hm2,N use efficiency increased with an increase in N rates reaching the peak value at 150 kg/ha (61.25 %) in the medium high fertility soil and at 120 kg/ha (43.15 %) in the medium low fertility soil.Compared with the regular urea,the highest N use efficiency of the released controlled urea was 22 % higher that on medium high fertility soil and 17 % higher on the medium low fertility soil.The agronomic efficiency of the release controlled urea was measured as 19-33 kg grains/kg N and 16-29 kg grains/kg N on the medium high and medium low fertility soils,respectively.Agronomic use efficiency for the regular urea ranged from 9 to 20 kg grains/kg N.The results suggested that the release controlled urea,only when it was designed with consideration of local climate and N requirement of the target crop,could offer its best effects on enhancing crop yield and N use efficiency;before release controlled urea was available,splitting application of regular urea is still one of the effective measures to enhance rice yield and N use efficiency." @default.
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- W267317008 date "2009-01-01" @default.
- W267317008 modified "2023-09-27" @default.
- W267317008 title "Effect of released controlled urea on rice yields and N fertilizer use efficiency." @default.
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