Response of Zinc Concentration and Distribution in Wheat Grain to Soil Zinc Fertilization in Dryland of Loess Plateau
[Objective]The changes in available soil zinc(Zn),wheat grain yield and grain Zn concentration were identified,so as to provide the important basis for optimizing Zn biofortification of wheat grain technology.[Method]Based on the location-fixed field trial initiated in 2017 in drylands of the Loess Plateau,the samples were collected to analyze the available soil Zn,wheat yield,yield components,Zn concentrations in grain and its tissues,Zn uptake and distribution in various plant parts under different Zn application rates in the wheat growing seasons of 2020-2021 and 2021-2022.[Result]Zn application did not significantly affect the wheat yield and yield components,but Zn concentration was increased by 28.8％-46.0％in grain and maximized to 31.1 mg·kg-1 at Zn application rate of 24.9 kg·hm-2;Zn concentration was increased by 31.8％-58.8％in bran and maximized to 87.6 mg·kg-1 atZn application rate of 27.3 kg·hm-2;Zn concentration was increased by 26.3％-41.3％in flour and maximized to 11.3 mg·kg-1 atZn application rate of 24.0 kg.hm-2.The grain Zn was found mainly distributed in bran,accounting for 77.7％-80.0％,with the average Zn concentration of 78.9 mg·kg-1;and 20.0％-22.3％Zn in flour,with the average Zn concentration of 10.8 mg·kg-1.With the Zn application rate increase,Zn concentration increased much more in bran than that in the flour.Available soil Zn was increased by 235.2％-1233.8％and 207.4％-825.9％in the 0-20 and 20-40 cm soil,respectively,and reached 9.47 and 2.50 mg·kg-1 at the maximum Zn application rate of 27.3 kg·hm-2,respectively.Available Zn of 0-100 cm soil layers contributed differently to wheat Zn uptake,with that in top soil contributed much more than that in deep soil layers.[Conclusion]Obviously,soil Zn application significantly increased soil available Zn and wheat grain Zn concentrations in drylands of the Loess Plateau,and for further improvement of wheat grained Zn nutritional and explore the increase potential in wheat grain Zn concentration,an integrative optimization should be implemented on Zn rates and application methods,and other agronomical measures,such as water,N and phosphorus supply,as well as green manure planting.
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