Field experimental studies on the effects of water quality and drip rate on soil salt distribution in drip irrigation under film

Drip irrigation under film is a new technology with great potential to use saline water safely, which can not only save water but also prevent soil salt from moving up. In the paper, Importance is focused upon the effects of drip rate, irrigated water amount and water quality on water and salt movement during point source infiltration. Point source infiltration experiments were conducted in field with different saline water and drip rates. The results indicate that power function fits well to the advances of horizontal wet front and ponding water area with time under the condition of sufficient water supply; the smaller the drip rate, the less the salt content along soil depth; the larger the drip rate, the more indistinctly the tendency of salt content increases with distance. It can also be found that irrigated water volume is a key factor to control salt cumulation when irrigating fields with saline water. Insufficient irrigation cannot guarantee enough leaching of soil salt for small infiltration volume. Besides, the rise of the salt content of irrigated water will increase salt content of the surface soil remarkably.