格拉姆柱花草对土壤改良作用的研究

本文通过分析实验证明，种植格拉姆柱花草五年和三年的土壤与对照区土壤相比，有机质增加０．７８２％和０．６９％，增幅分别为３８．１％和２５．９％；速效氮增加１８．７ＰＰＭ和１６．３ＰＰＭ，增幅达３７．４％和２１．３％；速效磷增加３．６５ＰＰＭ和６．９３ＰＰＭ，增幅为９１．２５％和１７６．４８％；速效钾增加６．２ＰＰＭ和４．７７ＰＰＭ，增幅为７２．９％和５８％；全氮增加０．０２５％和０．０２３２％，增幅分别为２４．０％和１７．８７％．土壤内重要营养元素指标均有大幅度增加，种植年限越长，土壤肥力提高越明显。与此同时ｐＨ值上升０．３４和０．２２，酸性降低；土壤容重降低０．３４４５ｇ／ｃｍ３和０．２０５０ｇ／ｃｍ３，土壤变得更为疏松；毛管持水量增加１２．５９％和１２．０２％，土壤保水蓄水能力增强。

The Study on Improving Soil by Planting Grama

By means of systematical analysis and experiments it has been proved in this essay that the organic substance in the soil of the experimental area, where the grama has been planted for a period of five and three years, has increased 0.782% and 0.69%, compared with the other area nearby without planting grama, and its increased range has covered 38. 1% and 25.9%. The quick-acting nitrogen also has had a rise of 18.7PPM and 16.3PPM with an increase range of 37.4% and 21.3%, while quick-acting phosphate, of 3.65PPM and 6.93PPM with an increase range of 91.25% and 176.48%; quick-acting potassium, of 6.2PPM and 4.77PPM, with an increase range of 72.9% and 58%; and whole nitrogen of 0.025% and 0.0232%, with an increase range of 24.0% and 17.87%. The indexes of the main nutritive elements in the soil have gone up to a great extent. The longer the period of its growing lasts. The more evidently the soil ferticity will bc enhanced. In the meantime the pH value of the soil has gone up by 0.34 and 0.22 and the acidity has reduced. The soil has become more porous and the soil unit weight has had a drop of 0.3445g/cm3 and 0.2050g/cm3 and its capillary water capacity has increased by 12.59% and 12.02%, the water preservation and storage capacity of the soil has been considerably strengthened.