摘要
氮、磷配施对第５年生紫花苜蓿草地增产不明显，单施磷肥效果极显著。施磷量（Ｘ）与苜蓿风干草产量（ｙ）的回归方程为：ｙ＝４２２６．３２＋５３．２８ｘ一０．１７３７ｘ２。确定了最佳经济施磷量和施磷量上、下限及相应苜蓿风干草产量。
Applying N一P fertilizers to the alfalfa grassland of the fifth growing year,the increase of yield was not significant,but only applying P fertilizer the increase was extremely significant.The regressive fomula of the amount of P fertilker applied(x)and yield of air dry alfalfa(y):y=4226.32+53.28x一0.4737x2.The amount of the optimun,the upper limit and the downer limit and the air dry yield were determined.
出处
《草业科学》
CAS
CSCD
北大核心
1994年第6期39-41,共3页
Pratacultural Science
关键词
紫花苜蓿
草地
磷肥
氮肥
效益
Medicago sativa grassland, N-P fertilizer
