Entropy weight coefficient evaluation of comprehensive index for flue-cured tobacco and its response to different water-nitrogentreatments

摘要

In order to investigate better mulch drip irrigation scheduling with the compromise among yield, quality and irrigation water use efficiency of flue-cured tobaccos, an experiment with different mulch drip irrigation and N fertilization treatments wasconducted in the south of China during 2012 growth season. After measuring the tobacco quality indexes, yield, and irrigation water use efficiency, the new method combining principal component analysis (PCA) model with entropy weight coefficient model was used to determine the weight of single attribute and comprehensive index, and to select optimum mulch drip irrigation and fertilization scheme. Results showed thatT_5 was the best treatment with the entropy weight coefficient of 0.8997, comprehensive quality evaluation value of 2.39, yield of 2741 kg/hm~2 and irrigation water use efficiency of 0.69 kg/m~3. Considering the quality, yield, water saving amount and irrigation water use efficiency, the irrigation amount of 12, 16 and 12 mm (T_5) each timecorresponding with root-extending stage, vigorous stage and maturity stage appeared to be the optimal mulch drip irrigation scheme, at the same time, 104 kg/hm~2 N fertilizer amount with the distribution proportion of basal dressing : topdressing = 7:3 was recommended to be the best nitrogen fertilization scheme. The combination of PCA model and entropy weight coefficient model was a successful attempt of selecting optimal water-nitrogen scheme for high quality and yield flue-cured tobacco cultivation,which not only reflected the subjective decision but also effectively integrated the objective information.