供磷水平对铁、锰、铜、锌在稻株中分布和糙米品质的影响

用室内盆栽试验，研究了不同磷肥施用量对铁、锰、铜、锌在水稻中分布和糙米品质的影响。结果表明，盆栽条件下，施用磷肥显著降低了Fe、Mn、Cu、Zn在IR68144地上部的积累量，显著增加了Fe、Mn、Cu、Zn在两个品种糙米中的分布。在不同磷肥施用水平下，Fe、Mn、Cu、Zn在IR68144地上部的积累量显著高于IR64，表明IR68144从根到地上部运输微量元素Fe、Mn、Cu、Zn的能力更强。此外，施用磷肥促进了富铁水稻糙米对蛋白质的积累，抑制其对直链淀粉的积累，且导致胶稠度变软，对IR64糙米品质的影响较小。说明合理的磷肥管理措施可在一定程度上调控子粒微量元素积累，改善稻米营养品质。

Effects of P fertilizer level on distribution of Fe,Mn,Cu and Zn and brown rice qualities in rice(Oryza sativa L.)

In pot experiments at green house, effects of P fertilizer on distribution of Fe, Mn, Cu and Zn in shoot of rice and quality of brown rice were studied. The results were summarized as follows: under the condition of pot cultivation with silty loam soil, due to P fertilizer application, amount of Fe, Mn, Cu and Zn accumulated in shoot of IR68144 in-creased compare with control significantly, and their distribution in brown rice of two eultivars increased significantly.Moreover, amount of Fe, Mn, Cu and Zn accumulated in shoot of IR68144 was higher than that of IR64 at different P fertilizer application levels, which suggested that transportation ability of Fe,Mn, Cu and Zn from root to shoot in IR68144 is stronger than in IR64. Besides, P fertilizer promoted the accumulation of protein in brown rice of IR68144, decreased the accumulation of amylose, and enhanced gel consistency of brown flee, and scarcely any affected brown rice quality of IR64. Those results indicated that appropriate P fertilizer management increase micronutrients content in grains and improve nutrition quality of rice.