草业学报Issue(3)：255-261,7.DOI:10.11686/cyxb20140330
不同施氮对饲草玉米产量品质及养分吸收的影响
Effects of different nitrogen additions on the yield,quality and nutrient absorption of forage maize
摘要
Abstract
A field experiment was carried out at a planting base of forage grass in Hongya,Sichuan,China to investigate the effect of nitrogen (N)addition at different rates (0,60,120,180,240 kg/ha,labelled as N0, N60 ,N120 ,N180 ,N240 respectively)on the yield,quality and nutrient absorption of forage maize (FM)(Zea mays-Zeamexicana hybrids,cv.Yucao 2)in 2009.Nitrogen application significantly promoted tiller number and biomass of FM at the trumpeting stage (TS)and the silking stage (SS),immediately after harvest. Aboveground dry matter increased with an increase in N rates,and increased by 60.9% at TS and 23.8% at SS under N180 compared with those under N0,but it decreased to some extent under N240.N application markedly enhanced crude protein (CP)content,and reduced the contents of neutral detergent fiber (NDF)and acid de-tergent fiber (ADF),so improving available nutritive value and forage quality of FM.Plant N,P and K con-tents reduced with plant development stage:at the jointing stage (JS):N 3.74%,P2 O5 0.456%,K2 O 2.50%;at TS:N 2.21%,P2 O5 0.238%,K2 O 2.32%;at SS:N 1.46%,P2 O5 0.184%,K2 O 1.08%.Nitro-gen addition significantly promoted N concentration,N and P uptakes,weakly increased P concentration,but weakly reduced K concentration and barely influenced K uptake.The order of N,P and K uptakes of FM was N>K2 O>P2 O5 ,the ratios of N∶P2 O5∶K2 O were 8.2∶1∶5.5 at JS,9.5∶1∶9.7 at TS,8.0∶1∶5.8 at SS.In conclusion,N and K nutrition were very important and the appropriate rate of N was 180 kg/ha for Yu-cao 2 plantings in this area.关键词
饲草玉米/氮肥/干物质产量/营养品质/养分吸收Key words
forage maize/nitrogen fertilizer/dry matter yield/nutritive quality/nutrient absorption分类
农业科技引用本文复制引用
陈远学,陈曦,陈新平,罗永,牟勇,吕世华,徐开未..不同施氮对饲草玉米产量品质及养分吸收的影响[J].草业学报,2014,(3):255-261,7.基金项目
国家玉米产业技术体系项目（CARS-02-24）和国家公益性行业（农业）科研专项（2008326）资助。 （）
