EFFECT OF CR AND AMENDMENTS ON YIELD AND HEAVY METALS CONTENTS IN DIFFERENT PARTS OF RICEJ.K. Parmar and K.P. Patel
A pot-house experiments was carried out at Micronutrient Project, AAU, Anand during 2005-06 to study the effect of Cr levels (0, 10, 20, 40, 80 and 160 mg kg-1 soil) in presence and absence of amendments (FYM and gypsum) on rice on coarse loamy soil with three replications under factorial completely randomized block design. The application of Cr decreased grain yield of rice with increase in Cr levels. While, the application at Cr20 level increased straw yield by 2.8 per cent over control thereafter it was decreased. The highest yield reduction of 19.9 and 8.6 per cent in grain and straw yield of rice were noted due to Cr160 level over corresponding control, respectively. The Cr content in grain, straw, husk and root of rice significantly increased with Cr level. The highest Cr content of grain (7.30 ?g g-1), straw (4.71 ?g g- 1), husk (5.68 ?g g-1) and root (18.97 ?g g-1) were recorded due to effect of Cr160 level. Whereas, Ni and Pb contents in different parts of rice did not show any significant changes due to Cr levels, except Pb content in rice grain. Further, it was revealed that the highest reduction of 21.3, 39.2, and 13.4 per cent in Cr content in rice grain, husk and root were noted due to application of FYM over their corresponding control, respectively. Whereas, gypsum application reduced 63.1 per cent Cr content in rice straw over control. There were no significant changes obtained in Ni and Pb content in different parts of rice except Ni content in rice straw. The highest Cr content in rice grain, straw, husk and root were recorded at alone application of Cr 160 level due to interaction effect. The effect of Cr did not significantly affect Ni content in rice grain, straw, husk and root. The Pb content of different part of rice also followed similar tends except Pb content in rice grain.
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