Status of DTPA-extractable cationic micronutrients and physio chemical properties of geo referenced soils under irrigated and rainfed ecosystems of Ramanathapuram district in Tamilnadu

The DTPA extractable cationic micronutrient and some important soil physic-chemical properties were investigated in two ecosystem of Ramanathapuram district of Tamil Nadu using GPS technique. Considering the critical limits of soil micronutrients, all soil associations were not adequately supplied with DTPA extractable micronutrients in both ecosystems. Irrespective of land use, the DTPA extractable cationic micronutrients were positively related with organic carbon content and negatively related to calcium carbonate content. The soils under rainfed condition possessed lesser values of all the nutrient availability than irrigated soil environment. Deficient soil samples were found in all the blocks, for Fe, Zn, Cu and B in district and none of the samples from all the blocks had deficient in range of Mn except Nainarkovil block