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根据黄土丘陵沟壑区水土流失严重、水资源短缺和旱灾频繁的特点 ,布设了不同形式的梯田田面集流补灌小区14个 ,小区面积25m2,随机排列 ,种植玉米。大旱的2001年 ,通过土壤含水量测定 ,及时掌握土壤水分变化情况 ,按照设计进行了2次补灌 ,补灌后土壤含水量有了明显提高 ,一定程度上缓解了旱情。试验结果表明 ,穴灌垄作覆膜小区比常规耕作田平均增产14 9 % ,穴灌丰产沟覆膜小区平均增产36 8 % ,穴灌1∶8丰产沟覆膜小区增产达57.3 %。
According to the serious soil and water loss, water shortage and drought in the loess hilly and gully areas, 14 different types of paddy fields with paddy fields were set up. The area of the plot was 25 m2 and were randomly arranged and planted with corn. The drought in 2001, through the determination of soil moisture, soil moisture changes in a timely manner to grasp, according to the design of the two supplemental irrigation, irrigation after the soil moisture has been significantly improved, to some extent, ease the drought. The results showed that the irrigation area of irrigated furrows increased by 14.9% on average compared with that of conventional tillage, the average irrigation yield increased by 36.8% in the hole irrigation and furrow irrigation area, and 57.3% in the hole irrigation 1: 8 area.