氮磷肥配施对黑麦草产量及养分吸收的影响

在江汉平原进行田间试验研究了氮磷肥配合施用对黑麦草产量、养分吸收及经济效益的影响。结果表明:在不施氮(N0)的基础上施用磷肥,增产效果不明显;在低氮(N150)条件下,施磷处理较不施磷处理可显著增产10.8%-16.1%;在高氮(N300)条件下,施用低量磷肥(P90)就可得到较好的增产效果,增产17.2%且差异达显著水平。在不同的磷水平上配合施用氮肥均可显著增产。氮、磷肥的施用可以相互提高养分的吸收。综合比较氮磷肥配施经济效益,在试验设计条件下,N300P90处理的配比效果最好,产量达62.00 kg/hm2;净利润最高,增收4 152.7元/hm2,产投比为2.23。

Effect of the Combined Application of N and P Fertilizer on Yield and Nutrients Uptake of Ryegrass

A field trial was carried out in Jianghan Plain to study the effect of the combined application of N and P fertilizer on the yield and nutrients uptake of ryegrass.It was revealed that when P fertilizer was applied alone without N fertilizer,revealed the forage yield had not been improved significantly;but under the condition of low N(N150) application,When P was applied,the yield could rise by 10.8%~16.1%,which was significant compared with the yield when no P was applied.Under the condition of high N(N300) application,low P(P90) application could induce greater yield increment,the yield increased by 17.2% significantly.P fertilizer application at different levels combined with N fertilizer can all increase forage yield significantly.Application of N and P fertilizer can improve nutrients uptake mutually.Compared synthetically,the effect of treatment with N300P90 was the best under the field trial condition and its yield reached 62.00 kg/hm2,while the net was 4 152.7 yuan/hm2 and the VCR(value cost ratio) was 2.32.