YIELD AND MINERAL CONCENTRATION OF RICE AS AFFECTED BY THE CONTENT OF Cd, P AND Zn IN SOIL
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Abstract:
The effect of the addition of Cd,P and Zn compounds on the yields of rice grains,plant shoots and the content of mineral nutrients in straw and Cd concentration in brown rice were studied in the greenhouse.P increas}ad the yields of rice grains and plant shoots,while Cd,Zn and interaction of P and Zn decreased them.There are similar 1near regression equations for the yields of rice grain and plant shoots.The linear regresaion equation for rice grain is:Y=17.24+0.0466(P)-0.1850(Cd)-0.1115(Zn)-0.0005(P-Zn)with R2=0.97**,where Y is grain yield (g/plant);(P) is concentration of added P (mg/kg);(Cd) is concentration of added Cd (mg/kg);(Zn) is concentration of added Zn (mg/kg);(P-Zn) is interaction of P and Zn.The mineral nutrients in rice straw were markedly affected by all treatments.The Cd concentration in brown rice increased with the increase of concentration of Cd,Zn and P added.However multiple linear regression analysis shows that only the Cd effect is the most significant.The Cd concentration in brown rice shows a highly significant correlation (r=0.75**) with Cd in air-dried soil at harvest extracted by 0.05 M HCl.The toxicological evaluation of Cd concentration in brown rice are discussed.
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