OAR@ICRISATPlant Nutrient Contribution by Rainfall in the Highly Industrialized Highly Industrialized and Polluted Patancheru Area in Andhra PradeshK V SMurthyauthorK LSahrawatauthorGPardhasaradhiauthorRainwater contains nutrients and can, in a low-input situation, constitute an important nutrient source for crop production. During 1981-90, rainwater was collected using standardized collection procedures at tbree different locations at ICRISAT, Patancheru, Andhra Pradesh. Samples were analysed for N, P, K, S, Ca, Mg and Na. Ion concentrations were low and varied from year to year. The mean pH was 7.05. Because the locations were close to each other, there was no significant. variation in tbe composition of rainwater among tbe locations. There were negative correlations between the amount of rainfall and the chemical parameters. Phosphorus was positively correlated witb N, K, S, Ca, Mg and Na. Patancheru is highly industrialized and its atmosphere will have a bearing on the composition of rainwater. Sulphur fertilizer response experiments should not be carried out at tbis location. On an average, rainfall at this location contributes, per hectare, 5.8 kg N, 0.4 kg P, 4.8 kg S, 1.7 kg Ca, 1.7 kg Mg and 10.5 kg Na. The increase in N, P and S contribution was higher during 1986-90 than in 1981-85.Soil Science2000Indian Sociely of Soil ScienceArticle

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