论文部分内容阅读
1997～ 2 0 0 1年 ,陕北地区降水总量少且有效性差 ,造成连续干旱频繁、干旱程度加重 ,玉米等 7种主栽作物 5年平均减产 69 8%。其对策 ,一是提高土壤肥力 ,改善土壤水分条件 ;二是调整耕作方法 ,减少耕层水分损失 ;三是巧播捉苗 ,提高水分转化效率 ;四是扩大耐旱作物种植面积 ,力争在旱灾中少减产。
From 1997 to 2001, the total precipitation in the northern part of Shaanxi Province was small and its effectiveness was poor, causing continuous drought and increasing degree of drought. The average yield of seven main crops such as corn decreased by 69.8% in five years. The countermeasure is to increase soil fertility and improve soil water conditions. Secondly, adjust cultivation methods to reduce the loss of water in tillage. Third, planted seedlings to enhance water conversion efficiency. Fourthly, to expand the planting area of drought-tolerant crops, Less drought reduction.