Abstract:

【Objective】 A field experiment was conducted on rice to evaluate the effect of Zn and Fe foliar fertilization on the concentration of these micronutrients, yield, quality and zinc-iron partitioning in plant. 【Method】 Two varieties Liangyoupeijiu and Jiahua1 were used. Yield, nutrients concentration and quality of rice were determined. 【Result】 The results indicated that different interactions of zinc and iron had significant effects on yield, harvest index, seed setting rate and 1000-grain weight. The optimal combination of fertilization for yield was Zn1Fe1. Under the optimal application condition, yield of Liangyoupeijiu and Jiahua1 could be significantly increased by 4.5% and5.6%. Under the foliar application condition, amylase content of rice was significantly lower than the control. Phytic acid content of two varieties was significantly lower than others under the Zn2Fe0. Different combinations of fertilizer also had significant effects on grain zinc and iron contents. The optimal combination of fertilization for enhancing zinc was Zn2Fe0. Under the Zn2Fe0 condition, zinc content of Liangyoupeijiu and Jiahua1 was increased by 69.75% and 41.65%. The two varieties had significant difference in distribution of iron. For Liangyoupeijiu, the optimal combination of fertilization for improving iron content of rice was Zn2Fe2, but for Jiahua1, it was Zn0Fe2. When the concentration of zinc sulfate was increased from 0 to 0.2%, the zinc contents in brown rice of Liangyoupeijiu were increased, while that in grain hull was increased and much higher than that in brown rice, and for Jiahua1, the zinc content in grain hull was higher too. With the increase of fertilization, more zinc and iron distributed in grain hull and panicle structures. 【Conclusion】 The results indicate that appropriate combined fertilization management can increase micronutrients content in grains and improve nutrition quality of rice.

Key words: rice, foliar application, zinc, iron, yield, distribution