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试验区概况试验设在陕西省志丹县东北,杏子河流域中游杏河乡,退耕坡地,土壤为黄绵土,水土流失严重,属干旱半干旱黄土丘陵区。海拔1,337～1,504米,年平均气温8.3℃,≥10℃的积温2971.1℃,年降水量为494.3毫米,集中于7～9月,无霜期150天左右,年日照2387.4小时。内容和方法供试牧草有沙打旺、红豆草、苜蓿(当地紫花苜蓿)等(以下简称三草)。前茬谷子,播前结合整地施底肥过磷
The experimental area profile test is located in the northeast of Zhidan County in Shaanxi Province, apricot basin in the middle reaches of Xinghe River, returning farmland slope, the soil is loessial soil, soil erosion is serious, is arid and semi-arid loess hilly area. The elevation is 1,337-1,504 meters with an annual average temperature of 8.3 ℃. The accumulated temperature of ≥10 ℃ is 2971.1 ℃. The annual precipitation is 494.3 mm. The annual rainfall is about 7 to 9 months. The frost-free period is about 150 days and the annual sunshine duration is 2387.4 hours. Content and methods The tested grasses are Astragalus adsurgens, sainfoin, alfalfa (local alfalfa), etc. (hereinafter referred to as three grass). Pre-harvest millet, pre-sowing combined with substrate fertilizer over phosphorus