Effect of drip application of chelated iron fertilizer on photosynthetic characteristics and yield and quality of wine grapes
[Objective]The study aimed to explore the effects of EDTA-Fe on the photosynthetic characteristics,fruit morphology,yield and quality of wine grapes in the eastern foot of Helan Mountain in Ningxia and provided a reasonable amount of iron fertilizer for the high quality and high yield of wine grapes in the eastern foot of Helan Mountain in Ningxia.[Method]4-year-old Marselan taken as the testing material,EDTA-Fe was dripped on the basis of conventional fertilization.Through a single-factor multi-level randomized block test design,four different EDTA-Fe drip levels were set as 7.50(T1),15.00(T2),22.50(T3)and 30.00(T4)kg/hm2,with conventional fertilization as the con-trol(CK).The photosynthetic characteristics(SPAD value,intercellular CO2 concentration,stomatal conductance,net photosynthetic rate and transpiration rate),fruit morphology(cluster length,transverse diameter,100-grain weight),yield and quality of wine grapes(soluble solids,titratable acidity,tannin,total phenols and anthocyanin)were determined.[Result]The application of EDTA-Fe could effectively im-prove the photosynthetic characteristics of wine grapes.Among them,the SPAD value of leaves in T2 treatment was the highest at fruit ripe-ning period,which was significantly increased by 19.71％compared with CK;The net photosynthetic rate,stomatal conductance and transpi-ration rate of T3 treatment were the highest,which were significantly higher than CK by 87.03％,107.14％and 76.25％,respectively;The intercellular CO2 concentration of T1 treatment was the highest,which was significantly increased by 57.56％compared with CK.The 100-grain weight decreased with the increase of EDTA-Fe concentration.The cluster length,soluble solids,sugar-acid ratio,tannin and total phe-nols content of T3 treatment were the highest,which were 10.99％,13.00％,19.16％,4.87％and 15.23％higher than CK,respectively;The anthocyanin content of T1 treatment was the highest;The yield from high to low was T3＞T2＞T1＞T4＞CK,Compared with CK,the yields of T1,T2,T3 and T4 treatments were significantly increased by 11.68％,16.57％,26.48％and 8.96％,respectively;The value of output from high to low was T3＞T2＞T1＞T4＞CK,T1,T2,T3 and T4 treatments were 3577,5075,8133 and 2744 yuan/hm2 higher than CK,respectively.[Conclusion]The application of EDTA-Fe in the wine producing area of the eastern foot of Helan Mountain can effectively promote the photosynthetic characteristics of wine grape leaves,increase the yield of wine grapes and promote the quality of wine grape.The optimum application amount of EDTA-Fe is 22.5 kg/hm2.
Eastern foot of Helan MountainWine grapesMarselanChelated ironYieldQuality
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NSTL
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