春青稞的氮磷化肥配合比例研究

The Ratio Between N/P Chemical Fertilizer Matching for Highland Spring Barley

1986—1987年,在西藏农牧学院及八一镇的砂壤及轻质砂壤土农田,对春青稞进行氮磷化肥下同配合比例的对比试验,观察苗情、测定产量、经济性状,计算经济效益。结果表明,氮肥作基肥早施是提高春青稞产量的重要措施之一,氮磷配合可使春青稞分蘖与拔节期提前1—2天。氮磷施用量越大,分蘖越多,群体不协调。氮磷比由1∶0.5提高到1∶0.75时,产量随磷肥量增加而提高。从产投比值看,每亩地以用氮10.9kg、磷8.2kg为宜。

The comparative experiments of different matching rates of N/P chemical fertilizersapplide to Highland Spring Barley were carried out in the farmlands with sandy loam andlight sandy loam by the Tibetan Agricultural and Animal Husbandry College and August 1Township in the years of 1986-1987 to observe its seedling growing conditions,measure itseconomic traits and calculate its economic returns.Results showed that early applying Nfertilizer as the base fertilizer was one of important measures to improve the yields ofHighland Spring Barley,and that mixture application of N/P fertilizers in good matchingmight make Highland Spring Barley have its tillering and Shooting stages 1-2 days in ad-vance.The more that N fertilizer is applied,the more tillers are produced so that its popula-tions are not in coordination.When the ratio between N and P is raised from 1:0.5 to 1:0.75,its yields increase with an increase in P fertilizer applied.It can be seen from the ratiobetween out put and input that 10.9 kg of N fertilizer per mu and 8.2 kg of P fertilizer permu are very suitable for Highland Spring Barley.