Papers

RESPONSE OF RICE PLANT TO DIFFERENT LEVELS OF CADMIUM UNDER DIFFERENT SOIL TEXTURE, AND ACIDITY TO PRODUCE SAFE FOOD (Pages : 38 - 43)

M.S. ISLAM, M.J. ABEDIN, A.K.M.M. HOSSAIN, A.K.M.A. BARI AND A.B. MONDAL

A pot experiment was to evaluate the effects of cadmium on growth, yield and nutrient concentration of rice grown under different soil texture and acidity to produce safe food for his nation. The experiment was laid out in a completely randomized design with three replications. Two levels of cadmium such as 0 and 20 ppm were tested in two types of soils viz. silty loam and silty clay under either neutral (pH 7.0) or acidic (pH 4.3) conditions. There were three replications there were 24 pots for the experiments. The pots were divided into two groups for two different soils (silt loam and silty clay soil). The 12 pots of each soil were filled with 5 kg of each soil. The pots selected for each soil was again divided into two groups for two different acidity level (pH 7 and pH 4.3). Three healthy rice seedlings (BRRI dhan28) of 35 days old were transplanted in each pot. The parameters studied were plant height, panicle length, filled grains panicle-1, 1000 grain weight and yields. Plant samples were analyzed for P, K, S and Cd. Results showed that addition of Cd, decreased the yield and yield contributing characteristics irrespective of soil texture and acidity. The detrimental effects of cadmium on yield were more prominent in silt loam and acid soils. The application of Cd in general decreased the concentration of P in grain and straw. Grain K content decreased but straw K content increased due to addition of Cd. The higher concentration of Cd in grain than straw of rice was found in acidic condition than grown in neutral condition. On the other hand, bioavailability and uptake of Cd were higher in silt loam soil than in silty clay soil. In acidic soils are not feasible to produce our safe staple food. Before rice crop production in acid soil should be properly manage soil pH and used balanced fertilizer to safe from heavy metal contamination of our food as well as our nation. Hence, heavy metals accumulation in rice grains in acidic condition is a big concern in souDownload


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