摘要
由于磷容易被土壤固定,不易移动,利用率很快下降,故一般认为以高效过磷酸钙为磷源,少量多次、表面和深层施肥相结合为宜。施于根系较密集处,能较多地提供植物磷营养。在低磷地区,磷肥不仅能提高产量,而且能改善品质,但在高磷地区效果不明显。尽管如此,仍有不少人认为不施磷肥是不明智之举,建议施用维持量为宜。
It is suggested generally that small quantity,repeat dressing of P in CSP and conbining top dressing with deeper ones in the soil are more efficient.Because in soils P becomes fixed easily, and moves rather slowly and runs unavailable in some soils rapidly.The more the P-fertilizer be dressed-to soil layers where roots densely distributed the better the nutrients to the plant will be. P-fertilization not only increases the yield of alfalfa but also(improves the quality of it in lower- P soils.While it is not natable in high-P soils.However,lots of people hoid that it may be unwise to cancel the P-fertilization for high-P soils.P-fertilizers should also be applied to high-P soils at a maintenance level nevertheless.
出处
《中国草地》
CSCD
1992年第6期66-69,共4页
Grassland of China
