Change of Soil Nutrient in the Process of Drip Irrigation under the Plastic Mulch

Abstract

In this paper, taking Shihezi reclamation area of Xinjiang province in China as study area, we analyses dynamic change of soil salt and nitrogen and phosphorus nutrient content in the process of drip irrigation under the plastic mulch, the results showed as follows: 1) Soil total salt content decrease respectively by 90.0% during 11 years of drip irrigation under the plastic mulch. 2) Drip irrigation under the plastic mulch can improve the content of soil total nitrogen and phosphorus significantly, the increasing of total nitrogen better total phosphorus. However, total nitrogen and total phosphorus increasing with year of drip irrigation under the plastic mulch is not linear trend, during 0 to 6 years of drip irrigation, soil total nitrogen and total phosphorus content decrease, but increase during 6 to 11 years of drip irrigation under the plastic mulch. Soil total nitrogen and phosphorus content increase respectively by 225.1% and 43.1% during 11 years of drip irrigation under the plastic mulch. 3) The change of soil total salt has no obvious relationship between the change of soil nitrogen and phosphorus during the drip irrigation under the plastic mulch in the saline-alkali fields, the increase of soil nutrient nitrogen and phosphorus maybe depends on the drip irrigation under the plastic mulch that can improve the soil structure or fertilization way.