Effects of magnetized water drip irrigation under degradable film mulching on yield and water use efficiency of processed tomatoes

In order to explore the impact of magnetized water drip irrigation on tomato yield and water use efficiency under degradable film covering, two types of field experimental irrigation systems were set up as follows: magnetized water drip irrigation（T） and conventional water drip irrigation（N）.There are three types of mulching films which are as follows: ordinary mulching film（M1）, black oxidized double biodegradable film（M2） and white oxidized double biodegradable film（M3）. The results show that compared with ordinary mulching films, the yields of black degradable film and white degradable film are averagely reduced by 1.14% and 3.56%, and the WUE is reduced by 1.16% and 3.52%, respectively. The water retention and heat preservation properties of the three types of mulching films from best to worst are M1, M2 and M3. Compared with conventional water drip irrigation, magnetized water drip irrigation can significantly increase the soil moisture content of the 0-40 cm and 0-60 cm soil layers. The LAI and above-ground dry matter mass of the magnetized water treatment are significantly increased compared with the non-magnetized treatment, and possesses a significant impact positive promoting effect on various photosynthetic processes indicators. Compared with the conventional water drip irrigation treatment, the yield of magnetized water drip irrigation treatment increases by 31.61%, and the WUE increases by 36.70%. Based on a comprehensive evaluation of each indicator based on TOPSIS analysis, it is believed that covering with black degradation film and drip irrigation with magnetized water of appropriate magnetization intensity（3.0×10~6 A/m） can replace the drip irrigation processing tomato planting model under ordinary film covering. The research can provide scientific basis for alleviating residual film pollution in northern Xinjiang, as well as improve tomato yield and water use efficiency in drip irrigation processing.