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| Effects of zinc spraying on wheat grain nutritional quality and zinc distribution on the Loess Plateau |
| Received:June 13, 2022 |
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| KeyWord:zinc;foliar application;amino acid;zinc distribution;scanning electron microscope spectrometer |
| Author Name | Affiliation | E-mail | | TANG Mengshan | College of Resources and Environmental Science, Northwest A&F University, Yangling 712100, China | | | Lü Zhiyuan | College of Resources and Environmental Science, Northwest A&F University, Yangling 712100, China | | | ZHAO Xiaohan | College of Resources and Environmental Science, Northwest A&F University, Yangling 712100, China | | | GUO Jiao | College of Resources and Environmental Science, Northwest A&F University, Yangling 712100, China | | | LIU Jinshan | College of Resources and Environmental Science, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | | MAO Hui | College of Resources and Environmental Science, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | maohui@nwsuaf.edu.cn |
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| Abstract: |
| To explore the effects of different zinc spraying schedules on wheat yield and flour quality on the Loess Plateau, two（F2）and four（F4）occurrences of foliar spraying with ZnSO4 at different wheat growth stages were evaluated over two years of field experiments. ZnSO4 foliar spraying was investigated for its effects on grain zinc, starch, protein, amino acid content, grain zinc distribution, and zinc bioavailability. Spraying ZnSO4 at different growth stages increased wheat grain Zn content, although the increase in amplitude varied with spraying schedules. Compared with the control group, the F4 treatment increased the grain zinc content of wheat by 72.3%-118.7%, and the grain zinc output by 127.3% -143.0%, which was significantly greater compared to the F2 treatment. Zinc spraying increased wheat protein and starch yields by 10.9%-25.1% and 5.1%-35.8%, respectively. The protein and amino acid contents of wheat grain were diluted in the first season but considerably rose in the second season, with methionine and phenylalanine in essential amino acids increasing by varying degrees for two consecutive years. The zinc content（weight percentage）in the embryo and endosperm treated with ZnSO4 foliar spraying（F2, F4）was greater than that in the control treatment, but the zinc content（weight percentage）in bran was lower. Moreover, the P/Zn molar ratio was significantly lower in the F4 treatment than in the control. Studies have shown that spraying Zn fertilizer can promote wheat growth, improve wheat nutrient absorption capacity, significantly increase grain Zn content, and improve Zn distribution to improve Zn bioavailability. Increasing the spraying schedules can improve the nutritional quality and zinc content of edible flour（endosperm）, which is essential for human dietary health. |
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