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兰州市地处我省中部干旱地区西侧,年降雨量仅189.3-403.1毫米,三日平均气温5.2℃,10厘米耕层平均地温低于5℃,月平均降雨量7.5毫米。早春干旱、低温,妨碍作物的正常生长发育,也影响到郊区早春新鲜蔬菜的生产和供应。早在一百多年前,劳动人民在与大自然的斗争中,因地制宜创造了以压砂进行地面覆盖栽培的方法,对保墒抗旱,调节地温,促进早熟,防治盐碱有着极大的作用。但近年来,由于一些地方砂源不足,铺压砂田费工多,劳动强度大,耕作倒茬不便,发展受到一定限制。
Lanzhou City is located in the western part of arid areas in central Shaanxi Province. The annual rainfall is only 189.3-403.1 mm. The average temperature of three days is 5.2 ℃. The average ground temperature of 10 cm of cultivated land is lower than 5 ℃ and the monthly average rainfall is 7.5 mm. Drought and low temperature in early spring impede the normal crop growth and development, and also affect the production and supply of fresh vegetables in the suburbs in early spring. As early as one hundred years ago, the working people in the struggle against nature created a method of ground cover cultivation with sand compaction according to local conditions, and played an important role in preserving soil moisture, regulating ground temperature, promoting precociousness and preventing and controlling salt and alkali. However, in recent years, due to the lack of sand resources in some places, the cost of laying sand fields is high, the labor intensity is large, and the inconvenience of tillage and cropping up is inconvenient. The development is subject to certain restrictions.