Saturday, 15 July 2006
170-34

Nitrogen Transformation in Soils Amended with Urban Industrial Waste and Crop Response.

Sutapa Bose1, S. Chandrayan2, and A. K. Bhattacharyya2. (1) Jawaharlal Nehru Univ / School of Environmental Sciences, New Delhi - 110067, India, (2) Jawaharlal Nehru Univ/ School of Environmental Sciences, New Delhi - 110067, India

Delhi generates a huge quantity of solid waste per day. The waste collected for the study was highly acidic in nature (pH- 2.7 to 4.4) and contains macronutrients, micronutrients as well as toxic elements. A pot-culture experiment was conducted by taking the two soils (JNU and Chhattarpur) amended with lime treated (0%, 0.5% and 1%) waste (0%, 10%, 20%, 30%). The moisture was maintained 50% of water holding capacity and the temperature was maintained at 280 C - 300 C. Two seedlings of pea and wheat were planted separately per pot containing 2 kg waste amended or control soil and the experiment was continued till the harvesting. Waste applications increased the total N in the soils. Lime application did not make any significant change in total N in both soils. Waste amendment increased the total nitrogen in both the soils. The percentage of total N was high in between flowering to pod formation stage. Lime treatments enhanced the nitrogen content in wheat plant in almost all cases. Waste and lime treatments enhanced dry weight in wheat plants (shoot and root) grown in Chhattarpur soil in almost all cases and dry weight of the different plants increased with time. The increasing percentage of waste application in soil reduced the nitrogen concentration in pea plant's shoot- roots. Both the root and shoot length of wheat plants increased with the application of 20% and 30% waste amended soils, but 30% waste amendment decreased dry weight of pea plant. Lime treatment significantly increased the length of root-shoot. The root-shoot length gradually increased with time. Maximum growth was observed in the treatment of 0.5% lime with 20% waste amended soils of JNU and Chhattarpur.

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