Effect of Advance Nitrogen Fertilizer on Cd Absorption and Translocation in Rice
In order to explore the effect of the forward transfer of nitrogen fertilizer on the cadmium absorption characteristics of rice and the cadmium content of brown rice,early rice'Zhuliangyou819'(low cadmium variety),'Luliangyou996'(high cadmium variety)and late rice'Xiangwanxian 13hao'(low cadmium variety),'Yuzhenxiang'(high cadmium variety)as the test materials,and 3 different tiller fertilizer application methods are set up,F1:no nitrogen fertilizer,F2:nitrogen fertilizer as a disposable application of fertilizer,F3:base fertilizer∶tiller fertilizer is 6∶4 apply.The test results showed that compared with F1,F2 and F3 significantly reduced the cadmium content in the roots from the booting stage to the mature stage of the early and late rice seasons,and suppressed the cadmium content in the stems and leaves.Among them,F3 had the best effect.F2 and F3 treatments were significantly re-duced the cadmium content and the transfer coefficient of each part in the mature period.The cadmium content of brown rice was the lowest under the F3 treatment in'Zhuliangyou819','Luliangyou996','Xiangwanxian13'and'Yuzhenxiang',which were significantly lower than F1 by 62.50％,41.67％,48.00％ and 55.00％.The performance of DCB-Cd in rice varies according to different rice seasons.Early rice is at full heading stage＞booting stage,late rice is at booting stage＞full heading stage;DCB-Fe of early and late rice is at full heading stage＞booting stage;un-der the treatment of nitrogen forward transfer,nitrogen promoted the formation of iron plaque on the root surface of the early rice season,and there was a negative correlation between the cadmium content of brown rice and the iron plaque on the root surface,but the opposite was true in late rice,so cadmium content in late rice was higher than that in early rice.Therefore,in rice production,the forward transfer of nitrogen fertilizer can reach the pur-pose of reducing the cadmium content of brown rice.
RiceCadmiumNitrogenRoot surface iron filmDifferent growth periods
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