Method for determining suitable area for centralized popularization of drip irrigation under plastic film in semi-arid region

The invention provides a method for determining an under-mulch drip irrigation centralized popularization appropriate area in a semi-arid region, which comprises the following steps of: firstly, determining an underground water burial depth value, an underground water burial depth critical value and an underground water maximum allowable drawdown value in a current crop planting region; the average irrigation water amount per mu of traditional ground irrigation and the average irrigation water amount per mu of under-film irrigation are determined, and the water amount difference of the two irrigation modes is calculated; and determining the representation mode of the underground water burial depth increase value of the center point of the under-film drip irrigation planting area, taking the underground water burial depth increase value of the center point of the under-film drip irrigation planting area as the maximum allowable depth drop value of the underground water of the area, and calculating the under-fi