Entropy Coefficient Assessment of Mulch Drip Irrigation Scheme in Tobacco Fields

Abstract

In order to find the optimum mulch drip irrigation scheme in tobacco fields of southern China plain, the flue-cured tobaccos were treated with different water and nitrogen levels, the yield, WPc, and the economic benefits (EIRR, ENPV, EBCR) were calculated, then the PCA model and the entropy weight coefficient method were introduced in order to select the preferable pattern of mulch drip irrigation. Results showed that: the application of mulch drip irrigation obtained the predicted effects, which improved the yield of flue-cured tobaccos and achieved satisfactory economic benefits; the entropy weight method was appropriate for the comprehensive evaluation of the mulch drip irrigation scheme in tobacco fields of southern China, which could combine the objective weight with the subjective weight, reducing the arbitrariness of using only objective weight or only the subjective weight; the optimum mulch drip irrigation treatment was T5, with the entropy weight value of 0.921; followed by T9; T2 was the poorest. Therefore, drip irrigation with 12mm, 16mm, and 12mm each time during root-extending stage, vigorous stage and maturity stage, and N fertilizer amount with 83.3kg/hm2could be applied as the water-nitrogen scheme, serving for the production of tobaccos with good quality and high yield under mulch drip irrigation construction in southern China plain.