不同肥水耦合对黄瓜产量品质及肥料偏生产力的影响

【Objective】Substrate cultivation is one of the effective ways to solve the adverse influences of soil texture deterioration on crop production which were cultivated in protected environment. With lacking standard of water and fertilizer management for substrate cultivation, in order to ensure the standard of irrigation and fertilizer coupling on yield, dry weight, quality, partial factor productivity of fertilizer and water use efficiency of cucumber cultivated in substrate in spring, the irrigation and fertilizer supply systems for high yield, quality, and efficient production of cucumber substrate were investigated.【Method】‘ChunyouNo.1’ cucumber was chosen as the materials, and the experiment was subjected to three irrigation water levels (W1 (75% crop evapo-transpiration, ETc), W2 (100% ETc) and W3 (125% ETc)) and three Yamazaki cucumber nutrient solution formula concentrations (F1 (75%), F2 (100%), F3 (125%)). The study analyzed the effects of different water and fertilizer coupling on cucumber yield, dry weight, quality, partial factor productivity of fertilizer and water use efficiency. The multivariate regression analysis and spatial analysis methods were used to obtain the best combination of irrigation and fertilizer for efficient cultivation of spring cucumber in plastic greenhouses. 【Result】The increase of irrigation was beneficial to the growth of cucumber yield and partial factor productivity of fertilizer (PFP). The yield (7 667.3 kg/667m ² ) and PFP (205.67 kg·kg ^-1 ) of W3F1 treatment were the largest during the 60 days of the harvest period. Under the same fertilization conditions, PFP was increasing with the increase of irrigation volume. Under the condition of F1, the net photosynthetic rate of W3 treatment was lower than W1, but its leaf area index was larger, therefore higher assimilation amount and yield were obtained. Under the same irrigation condition, the Vitamin C and reducing sugar performance of cucumber fruit under W1 level was the best, while the soluble solids and soluble protein of cucumber fruit under W3 had the best value. Through the multivariate regression analysis and the spatial analysis methods to evaluate yield, quality and partial factor productivity of fertilizer, the results showed that the fertilization and irrigation amount obtained was about 36.0-42.2 kg/667m ² and 198.0-219.8 m ³ /667m ² , or 42.2-44.6 kg/667m ² and 206.3-219.8 m ³ /667m ² . 【Conclusion】Irrigation level and fertilization level significantly affected growth, yield, quality, WUE and PFP. The best strategy of fertilization and irrigation for the production of drip-irrigated cultivated cucumber grown in substrate bags in Spring is level which yield, nitrate content and PFP of cucumber were ±10% of optimal value.