摘要
诸多施氮实践证明，高寒人工草地施氮量每公顷控制在７５公斤或７５公斤以下时，均能获得较好的经济效益。一般每公斤氮素大致可获取１４～４０公斤于物质。土壤含氮量相对较低的黑钙土类区施氮增产效应最高，棕钙土类、栗钙土类次之，而土壤含氮量相对较高的高山草甸土类区则最低。地区越趋高寒，牧草生长季越短，土壤耗氮量亦越低；反之则高。氮、磷肥合施增产效应比单施氮或磷大致可提高３０％以上。
Many N-application practices indicate that:N- application to the alpine sown pastureat a rate of 75kg/ha or less will get a better economic result. The incremental effect ofN-application Varies greatly according to the different areas and different varieties ofherbage,one kg of N-application can get 14～40 kg herbage dry matter.The incre-mental effect of N-application is closely related to soil types.The chernozem,whichhas a relatively low N content,response well to N-application.The burozem and cas-tanozem response weaker than cherozem,whereas the alpine meadow soil,having ahigh N content, has a lowest incremental response to N-application,This law is di-rectly correlated to the vertical zonal distribtition of the soil type of Qinghai- TibetPlateau,that is,the higher and colder the ares is,the shorter,the growing period andthe less N constimed in the soil.N- application mixed with P,the incremental responsewill be about 30%higher than the N or P application.
出处
《中国草地》
CSCD
1994年第2期76-80,共5页
Grassland of China
关键词
高寒草地
人工草地
施肥
氮肥
alpine pasture,sown pasture,N-application on grasses,incremental response,soil nitrogen content
