免耕播种优良牧草改良草山草坡的试验

THE EFFECT OF IMPROVING HILISIDE PASTURES BY SEEDING ELITE FORAGE VARIETIES UNDER ZERO-TILLING

在疏林阴坡、半阴半阳坡和阳坡天然草地免耕播种优良牧草改良草地,最重要的是选择适宜的草种和草种组合,采用较大的播种量,其次是人工割除天然草本和灌木,用钉耙划破地衣及苔藓复盖度较大的地面,选在秋雨连绵季节播种。改良后的草地三年内平均产草量比对照的同类天然草地分别提高3.56倍、2.24倍和1.75倍,且草质得到了明显改善。

The most important things for improving hillside pastures by seeding forages under zero-tilling are those; 1. the chose of appropriate varieties; 2. the optimum conbination of varieties; and 3. the seeding rate should be larger than usual. Second to them are those: 4. to clean off the natural grasses, forbs and bushes in the area where the lands are covered by lichens and bryophytes, then the spike-tooth harrow was used to break the surface of the soil. Seeding should be done in painy days, autumn. By taking these measures, the hillside pastures have been improved; the average hay yields in three years are 3. 56, 2. 24, and 1. 75 times of that of the control.