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以大田不同滴灌管铺设方式下的滴灌棉花为对象,研究其最佳灌水时间。试验在同一灌区内不同滴灌管铺设模式下,通过滴头正下方开挖坡面,观察湿润锋的趋势及其随灌水时间的变化情况。结果表明:在大田膜下滴灌条件下,土壤水平湿润锋基本呈圆形分布;在一定灌水量和滴头流量条件下,土壤垂直湿润锋明显地大于水平湿润锋,且随着灌水时间的增大呈二项式关系,拟合公式R~2均大于0.98;由此可以确定该地区滴灌棉花一膜两管方式的滴灌棉花灌水时间8h为合理,一膜三管方式滴灌棉花灌水时间6h较为合理。
The drip irrigation cotton under different drip irrigation pipe laying methods in Daejeon was used to study the best irrigation time. Under different drip irrigation patterns in the same irrigated area, the slopes were excavated right below the dripper to observe the trend of wetting front and its change with irrigation time. The results showed that under the condition of drip irrigation under field, the horizontal wetting front of soil was basically circular. Under certain irrigation and dripper flow rates, the vertical wetting front of soil was obviously larger than that of horizontal wetting front. With the increase of irrigation time The results showed that the fitting formula R ~ 2 was greater than 0.98. It could be determined that drip irrigation cotton drip irrigation time of one film and two tubes in this area was 8 h, and the drip irrigation time of one film and three tube method was 6 h reasonable.