Study On The Coupling Effect Of Water And Fertilizer In Drip Irrigation Grape

Based on drip irrigation experiment,"Frei" grape as the research subjects, the effect of water andfertilizer coupling on grape growth, water consumption, photosynthetic characteristics, yield, quality, wateruse efficiency and economic benefit have been studied. The purpose is to seek proper irrigation fertilizersuitable for grape growing and obtain high yield and quality, providing a theoretical basis for water-savingdrip irrigation fertilizer for fruit trees. The main conclusions are as follows:⑴. the change trend of grape water consumption is roughly the same in each growth period. In the0-50cm depth soil, irrigation amount is larger, the greater the water consumption; In the condition of thesame amount of irrigation and different fertilization, the amount of fertilizer increases with increasing ofwater consumption; Below50cm soil layer, water consumption is no significant difference among differenttreatments. Through the analysis of water consumption characteristics, concluded that fruit enlargement isthe critical period for the water demand of grapes, followed by shoots growing, mature, flowering.⑵. Irrigation at400m3/667m2with nitrogen at17.1kg/667m2for vegetative growth were observedoptimum. We concluded that shoot length and ear weight with irrigation amount showed highlysignificant relationship by correlation analysis, and using a variety of regression curves fitted theexponential relationship with shoot lengths and irrigation; the quadratic function relationship with earweight and irrigation.⑶. The photosynthetic and transpiration rate is sensitive to moisture，water deficit will be significantlyreduced photosynthesis; By contrasting photosynthetic characteristics under different water and fertilizerconditions，we found treatment4has the maximum photosynthetic rate and treatment2has the minimumtranspiration rate, treatment4of transpiration rate is in intermediate level. Irrigation at325m3/667m2withnitrogen at17.1kg/667m2for vegetative photosynthesis were observed optimum.(4). Through the regression model to calculate the: Irrigation at384m3/667m2with nitrogen at16.3kg/667m2for yield were observed optimum. Irrigation at326m3/667m2with nitrogen at14.4kg/hm2forBrix were observed highest.(5). Through the contrast analysis, we found that irrigation water treatment8and4acquired higherwater utilization efficiency, irrigation water use efficiency decreased with the increasing of irrigation water;The treatment of high water> middle water treatment> low water treatment, the treatment3of fertilizeruse efficiency is the highest and treatment7of fertilizer use efficiency is the lowest.(6). Contrast the ratio of output to input in each treatment, We concluded that the ratio of treatment4reaches maximum, the treatment9of low water and fertilizer has a minimum ratio. Through the analysis ofthe calculated index weights, we found that the grape as well as a larger contribution to the comprehensivebenefit, weights of Sugar content, irrigation water use efficiency, yield of all the top three indicators, Thisshows that reasonable and effective irrigation fertilization, while increasing production, improving cropquality is a new trend of development of water-saving irrigation.