摘要
探讨了不同肥力水平水稻土与水稻控释氮肥对晚稻的应用效应及经济效益。试验、示范结果表明 ,晚稻施用控释氮肥( 90kg/hm2 N)比等氮量尿素增产 4 4 %～ 16 6 %,比无氮区增产 37 4 %～ 42 1%。增产的主要原因是施用水稻控释氮肥后 ,促进了晚稻生育中、后期对氮的吸收 ,使氮素利用率达到 6 9 7%～ 74 1%,比等氮量尿素平均高 33 3%,且其氮素生产效率平均高6 8 0 %,施用水稻控释氮肥可获得较高的经济效益 ,比等氮量尿素的纯收益平均增加 10 16 5 8元 /hm2 ,比倍氮量尿素平均增加12 2 1 78元 /hm2 。施用水稻控释氮肥的增产效果、氮素利用及经济效益表现出 :中、低肥力稻田 >高肥力稻田。
Effect and economical benefit of controlled-release nitrogen fertilizer application on late rice in different basic fertility of paddy soils was studied. Experimental and demonstrative results showed, that late rice of applying rice controlled-release nitrogen fertilizer (90 kg/hm 2 N) was increased by 4.4%～16.6% over 90 kg/hm 2 N of urea plot, increased by 37.4%～42.1% over no N plot. Reason of increase yield was N absorption in late rice medium and later stage was promoted after rice controlled-release N fertilizer application. N recovery in rice controlled-release N fertilizer with 90 kgN/hm 2 plot reached 69.7%～74.1% and was higher by on average of 33.3 percent than that in urea plot with 90 kgN/hm 2. N productivity of rice controlled-release N fertilizer with 90 kgN/hm 2 plot was higher by on average of 68.0% than that in urea plot with 90 kgN/hm 2. Net profit of applying rice controlled-release nitrogen fertilizer average was increased 1 016.58 yuan/hm 2 compared with urea plot. Increasing yield effect?nutrient utilization and economic efficiency of applying rice controlled-release nitrogen fertilizer were in order to: medium and lower fertility paddy soil>high fertility paddy soil.
出处
《湖南农业科学》
2002年第5期21-24,共4页
Hunan Agricultural Sciences
基金
湖南省"九五"重点攻关项目 ( 99NKY10 0 4-0 7)
农业部"九五"重点攻关项目
农业部"九四八"项目经费资助
关键词
水稻
氮肥
施用效应
经济效益
土壤肥力
产量
rice controlled-release nitrogen fertilizer
soil fertility
rice yield
N fertilizer use
benefit
