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固原县草场面积252万亩,由于自然和人为因素等原因,全县96.8%的草地在不同程度上退化,其中二、三级退化草场达89.8%、为了寻求大面积改良天然草地的途径,提高产草量和质量,于1981年奎1983年在河川公社兆山,堡家山进行改良试验。一、自然条件试验地海拨1620～1850米,供试面积206亩。该地区年平均气温7.16℃,年均降水量418.75毫米,无霜期153天,≥0℃年积温3404.7℃。地形坡度为15～30度,土壤为湘黄土,0～27厘米土层营养成分分析,天然草地、1号农地和2号农地含水量分别为8.5、12和14%;含全氮分别为0.0277、
Guyuan County covers an area of 252 mu. Due to natural and man-made factors, 96.8% of the grassland in the county degrades to varying degrees. Among them, 89.8% of the degraded grassland in the second and third grades, in order to seek large-scale ways to improve the natural grassland, Yield and quality, in Kui 1983 in 1983 in Kawasaki commune river, Fort home improvement test. First, the natural conditions to test 1620 ~ 1850 meters above sea level, for the test area of 206 mu. The annual average temperature of 7.16 ℃, the average annual rainfall of 418.75 mm, 153 days frost-free period, ≥ 0 ℃ accumulated temperature 3404.7 ℃. The slope of terrain is 15 ~ 30 degrees, the soil is Xiang loess, and the nutrients of 0 ~ 27 cm soil layer are analyzed. The water content of natural grassland, farmland No. 1 and farmland No. 2 are 8.5, 12 and 14% 0.0277,