膜下滴灌水氮耦合对烤烟综合效益的影响

为了寻求贵州烟区膜下滴灌条件下烤烟优质高产的水氮耦合方案,设计不同滴灌量与施氮量处理,观测不同处理对烤烟品质、产量和灌溉水利用效率的影响,计算不同处理膜下滴灌工程的经济效益(国民经济内部收益率,经济净现值,经济效益费用比),并引入主成分分析方法与熵权系数评价模型,对水氮耦合方案进行优选。结果表明,T5处理为膜下滴灌条件下综合效益最优的水氮处理,熵权评价值为0.934;T6次之;T7最差,熵权值仅为0.611。因此伸根期、旺长期、成熟期滴灌量12、16、12mm/次,施氮量75kg/hm2可作为贵州烟区膜下滴灌工程烤烟优质高产的水氮耦合方案。

The Experimental Investigation on Effects of Water-nitrogen Coupling Schemes on Quality of Flue-cured Tobaccos and Economic Benefits Under Mulch Drip Irrigation Condition

To find an optimum water-nitrogen scheme under which tobaccos can obtain a good quality and high yield under mulch drip irrigation condition in Guizhou ,different drip irrigation amount and fertilizer amount were designed ,the flue-cured tobacco quality , yield ,irrigation water use efficiency among different treatments were observed ,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 pat‐tern of mulch drip irrigation .The results showed that :the optimum water-nitrogen coupling treatment with best comprehensive ben‐efits under mulch drip irrigation condition was T 5 with the entropy weight value of 0 .934 ;followed by T6;T7 was the poorest with the entropy weight value of 0 .611 .Therefore ,the scheme with drip irrigation amount of 12 mm ,16mm ,and 12mm each time for root-extending stage ,vigorous stage and maturity stage ,respectively ,and N fertilizer amount of 75kg/hm2 could be applied as the water-nitrogen scheme ,serving for the production of tobaccos with good quality and high yield under mulch drip irrigation construc‐tion in Guizhou tobacco cultivation areas .