混播草地禾草及土壤主要养分变化研究

Study on Grass and Soil Nutrient of the Grass-Legume Mixture.

在干旱条件下研究了豆科、禾本科牧草混播草地禾草粗蛋白质含量以及土壤耕层主要养分的变化。结果表明，生长第４年混播草地禾草叶片的粗蛋白质含量比单播禾草提高１９．１％，茎的粗蛋白质含量提高１８．１％；生长第３年混播草地土壤０～３０ｃｍ的有机质提高８．５％，全氮提高１３．３％，速效钾提高１６．２％，全磷降低４．８％。

Grass and Soil nutrient chang of the grass-legume mixture were studied under dry condition. The result showed: After 4 years, the crude protein in the grass leaves in the mixture was 19.1% higher than that in the pure grass sward, and it in the grass stems in the mixture was 18.1% higher than that in the pure grass sward. After 3 years, the organic matter, total nitrogen and rapidly available Potasium in the mixture in 0～30cm deep Soil were 8.5%, 13.3% and 16.2%, respectively, higher than those in the basic Soil. The total phosphorous was 4.8% lower than that in the basic soil.