羊草草原改良措施与效果

Improved Practice and Effect of Leymus chinensis Grassland

198 0～ 1997年改良退化草原 4 349.2 km2 ,主要改良措施 :1浅耕翻改良 ,有效利用 15年 ,年均增产 90 .5 %。2松土改良 ,有效利用年限 6～ 10年 ,平均增产 70 .35 %。 3施肥改良 ,其中施尿素 187.5 kg/ hm2 ,产草量提高 3.2倍 ,施厩肥 30～ 37.5 t/ hm2 ,第二年增产 5 3.5 %。 4引种国内外苜蓿品种 2 5个 ,筛选出一批耐寒抗病品种 ,每年割两茬 ,干草产量 4 92 7.5 kg/ hm2 ,是对照的 3倍。表现好的品种有黄花苜蓿、肇东苜蓿、公农 1号苜蓿、公农 2号苜蓿、草原 2号苜蓿。

From 1980 to 1997, an experiment of improving deteriorated rangeland was carried out. The approaches adopted and their effects are as follows: ①Grassland improved by shallow ploughing its effect lasted 15 years. The average annual herbage yield increased by 90.50%. ②Grassland improved by deep loosening. Its effect lsated 6～10 years. The average annual herbage yield increased by 70.3%. ③Grassland improved by appling fertilizer 187.5 kg of urea was used per ha. The annual harbage yield increased by 3.2 times. If 30～37.5 t of manure is applied per ha, the herbage yield of the following year can be increased by 53.5%. ④Use of the selected fine varieties of alfalfa, sone coldness and disease resistand varielies were selected and grown. Each year 2 harvests can be reaped. Its annual herbage yield equals 3 times. The yield of the local variety. ⑤The effect of interseeding is not good.