我省约有7000多万亩三荒地,但绝大多数植被破坏,水土流失严重。因此,把我省特别是中、东部地区的三荒地建设成高质量的人工或半人工草地,对改善农业生态环境、控制水土流失、发展农区畜牧业都是至关重要的。三荒地种草不但要有适宜的优良草种,而且需要掌握适宜播种期。否则,难以取得预期效果。为此,我们于1987年开始,在静宁县甘沟乡进行了牧草不同播期效果观察试验。 There are about 7,000 hectares of wasteland in our province, but most of the vegetation is damaged and soil erosion is serious. Therefore, to build highland artificial or semi-artificial grassland in the province, especially in the middle and eastern parts of the country, is of vital importance for improving agricultural ecological environment, controlling soil and water loss and developing livestock husbandry in rural areas. Three wasteland planting not only must have suitable fine grasses, but also need to grasp the appropriate sowing period. Otherwise, it is difficult to achieve the desired results. To this end, we started in 1987, Ganning Township, Jingning County were observed different effects of forage sowing.