The Efficiency of Zn Fertilization on Enhancing Grain Zn Mass Concentration in Aerobic Rice

摘要

Rice is a major source of energy and minerals for people whose diets are predominantly based on rice, to evaluate the potential role of Zn fertilization strategy (including Zn supply levels and ways) in increasing Zn concentration in rice grain need to be better understood and two so-called aerobic rice cultivars (Handao502 and Baxiludao) were used for this study. Field-condition experiment was carried out with eight Zn supply ways. Zn supply ways effect on shoot ZnMC was not significant neither for Baxiludao nor Handao502, while grain ZnMC was affect by Zn supply ways significantly, with foliar Zn supply grain ZnMC increased for both varieties and the grain ZnMC was increased to 21.37 mg/kg and to 24.21 mg/kg for Handao 502 and Baxiludao with only Foliar Zn application instead of Zn as soil applications. It could be concluded that in aerobic rice it is difficult to enhance grain ZnMC to reach the level human consumption demand by simply soil Zn supply or foliar Zn. Based on the relations among shoot Zn mass concentration, grain Zn mass concentration, Zn uptake and Zn supply, three approaches on enhancing grain Zn are suggested in this study.