Abstract:

By a field experiment, the dynamic of Fe、Zn、Cu、Mn、Mg and Ca contents and accumulation rate in rice grains, and their relationships with protein content were studied. The results indicated that the content of Fe, Zn, Cu, Mn, Ca and Mg in rice grains decreased rapidly during the first 10 days after flowering, and became stability after 20 days after flowering. Among the 6 mineral elements, the variable degree of Ca content in rice after flowering was the greatest, while that of Mg content the least. The variable degree of the 6 mineral elements content in rice after flowering of Indica rice Diantun502 was larger than that of Japonica rice Hexi 39. The dynamic trend of the 6 elements content and protein content in rice after flowering were the same. There were significant relationship between the 6 elements content and protein content in rice. The dynamic development of Fe, Zn, Cu, Mn and Mg accumulation in rice after flowering were fit to logistic regression equation. The rapid increasing period and actual increasing period of the 5 mineral elements accumulation after flowering were earlier and shorter than that of dry matter accumulation in rice.