Effects of Sulfur Application Period on Yield and Physiological Characteristics of Strong-Gluten Wheat
To clarify the effects of sulfur application at different stages on the yield and photosynthetic charac-teristics of strong-gluten wheat,and to determine the appropriate time for sulfur fertilizer application,from 2019 to 2021 during two wheat growth seasons,using strong-gluten wheat Gaoyou 2018 as the experimental material,three sulfur application periods were set:before sowing(S60-b),topdressing at jointing stage(S60-j),and topdressing at anthesis stage(S60-a),with a sulfur application rate of 60 kg/ha,and no sulfur application(CK)as the control.The effects of leaf area index(LAI),relative chlorophyll content of flag leaf(SPAD),soluble protein content,solu-ble sugar content,yield and components of strong-gluten wheat under different sulfur application treatments were studied systematically.The results showed that compared to CK,S60-b,S60-j and S60-a could all significantly in-crease the thousand-grain weight(TGW),maximum grain filling rate and yield of Gaoyou 2018.In the two growing seasons,the average increase of TGW was 6.23％,4.27％and 7.04％,respectively;the increase of TGW was the highest at 35 days post anthesis,which was 5.51％,3.17％and 6.12％,respectively.The average increase of maxi-mum grain filling rate was 2.84％,1.76％and 3.49％and the average increase in yield was 9.20％,2.73％and 5.71％,respectively.However,sulfur application had no significant effect on the number of ears and grains per unit area of Gaoyou 2018.Sulfur application at different stages had significant effects on the photosynthetic characteris-tics of strong-gluten wheat.The LAI,SPAD value of flag leaves in the middle and late stages of growth,the soluble protein content of flag leaves at 22 and 29 days post anthesis and soluble sugar content in flag leaves at 35 days post anthesis were significantly increased by S60-b and S60-a treatments.The five above indexes increased by more than 26.16％,7.38％,16.90％,55.29％and 81.11％,respectively.According to the results of two years,before so-wing and topdressing at the anthesis stage with sulfur fertilizer could significantly increase the LAI of flag leaves in the middle and late growth stage,maintain high SPAD value,delay flag leaf senescence,increase the contents of sol-uble protein and soluble sugar,TGW and filling rate at the end of grain filling,showing higher yield.In summary,sulfur application have a positive regulatory effect on the yield of strong-gluten wheat,and before sowing and top-dressing at the anthesis stage have a good regulatory effect.
万方数据
维普
