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A crop nutrient survey was conducted in 54 mandals covering 150 rice fields in Karimnagar district of Andhra Pradesh were studied for distribution of DTPA extractable Zn, Cu, Fe and Mn and their relationship with some soil properties. Soils of the selected rice fields are non-saline and the pH of the soil was ranged from 7.29 to 8.33 among selected villages of 54 mandals, and was neutral to slightly alkaline in reaction. Organic carbon content of the soils ranged between 1.1 to 7.6 with a mean of 3.6%, and was in categorized as low to medium. The content of micronutrient increased with the increase in organic carbon and decreased with increase in pH and CaCO3. As per critical limit prescribed for Zn, Fe and Mn; 50, 26 and 2% of the soil could be rated as deficient in available zinc. Iron and manganese respectively, copper was found to be adequate.
Critical limits, DTPA extractable micronutrients, rice soils.
The knowledge of distribution of micronutrient cations in soils provides an idea of the inherent capacity of soils to supply the nutrients. Past studies reveal the content and distribution of the nutrient cations in different soils and their relationship with soil properties [1-5]. However, information in this regard for the soils of Karimnagar of Andhra Pradesh is scanty and therefore, an attempt has been made to assess the micronutrient status in selected rice soils and their relationship with some important soil properties. Therefore, the present investigation was carried out with the main objective of distribution of micronutrient status in rice growing areas of Karimnagar district of Andhra Pradesh.
The content of organic carbon increases the increased the available micronutrients and available micronutrients decreased with increase in pH and CaCO3. As per critical limit prescribed for Zn, 50% of the soil could be rated as deficient in available zinc. Iron, copper and manganese were found to be adequate. The copper content of the soils was above the critical level.
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