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１９９２～１９９５年，在安塞黄土丘陵区对种植的优良牧草沙打旺、紫花苜蓿、红豆草、白花草木樨和无芒雀麦进行了地上净初级生产量、蒸腾和土壤水分的测定。试验结果表明：通过建造人工草地，能更好地利用水资源，提高土地生产力，其水分利用效率是天然草地的２．２～７．１倍。为此我们认为，在黄土丘陵区，改变单一种植粮食的生产方式，在大面积坡地进行人工种草或草粮轮作，是提高该地区水分利用效率和土地生产力，形成草－畜－农结合，实现农业持续发展的主要措施．
From 1992 to 1995, the fine net grass production, alfalfa, sainfoin, mulberry whitebamburn and broccoli were planted in the loess hilly region of Ansai for net primary production, transpiration and soil moisture. The test results show that the water use efficiency of natural grassland is 2.2 ~ 7.1 times higher than that of natural grassland by using artificial grassland to make better use of water resources and improve land productivity. To this end, we think that changing the mode of production of single grain crops in the loess hilly region and carrying out artificial or herbaceous rotation on a large area of slope is to improve the water use efficiency and land productivity in the region, and to establish a grass-livestock-peasant combination, The main measures to achieve sustainable development of agriculture.