Water and salt regulation and control method suitable for machine-harvested cotton in arid region

The invention discloses a water and salt regulation and control method suitable for machine-harvested cotton in arid regions, which comprises the following steps: firstly, selecting a drip irrigation arrangement mode, and setting different moisture treatments; secondly, spring irrigation is not carried out, ploughing, tape laying and film covering are carried out in late March, sowing is carried out when the soil temperature reaches a certain temperature, and cotton seeds special for saline-alkali soil are used; measuring the water content and the salt content of the soil at the key node of the cotton growth period and one day before and after irrigation. By comprehensively analyzing the soil water-salt dynamic state, accurate regulation and control of the soil water-salt state of the machine-harvested cotton field in the arid region are achieved, and the optimal water and salt conditions needed by cotton growth are ensured. The method is especially designed for the environmental conditions of arid regions, c