12种紫花苜蓿干草产量与土壤养份变化的关系分析

Relationship Between Dry Yield of Twelve Alfalfas and Soil Nutrient Contents.

对３年的干草产量和种植前后土壤５种主要养份含量的测定结果表明，有机质、有效磷、速效钾和全氮４种养份种植后含量降低，只有水解氮含量增加。通过相关和回归分析，５种土壤养份含量的变化与干草产量之间存在明显的直线回归关系，其回归效果都达到显著（Ｐ＜０．０５）或极显著（Ｐ＜０．０１）水平。此结果在紫花苜蓿种植生产实践中，对达到高产和培肥地力具有一定的指导意义。

ry yields of alfalfas and five main soil nutrient contents before and after alfalfa growing were measured from 1991～1994. The results showed that there were fewer organic matter, effective phosphorus, quick effective potassium and total nitrogen in the soil after growing alfalfa than that in the soil of no alfalfa growing. Nitrogen hydrolysate raised in the soil of alfalfa growing. By the analyses of interrelation and regression, there were obvious limear relation ships between soil nutrient and alfalfa dry yield.