DISTRIBUTION OF MICRONUTRIENT CATIONS IN DIFFERENT PHYSIOGRAPHIC AND LAND USE UNITS OF THOTAPALLI AYACUT AREA OF NORTH COASTAL ANDHRA PRADESH
2019
Himabindu, K | Gurumurthy, P | Prasad, PRK
The distribution of DTPA extractable micronutrients was studied in six major physiographic and land use units namely tankfed uplands, rainfed uplands, tankfed middle lands, rainfed middle lands, tankfed plains and tankfed lowlands in proposed ayacut area of Thotapalli major irrigation canal of North Coastal Andhra Pradesh. DTPA-extractable zinc and copper were higher (0.11 to 0.93 mg kg-1 and 0.65 to2.56 mg kg-1 , respectively) in Devarapalli, Aamiti and Maddivalas profiles while, lower in Gujjangivalasa, Patikivalasa and Gangada profiles (0.09 to 0.33 mg kg-1 and 0.43 to 1.87 mg kg-1 , respectively). DTPA-Fe and Mn were highest in soils of Gujjangivalas, Amiti and Devarapalli pedons. In general, DTPA extractable micronutrients were relatively higher at surface horizons and decreased with soil depth and their distribution followed the similar trend as that of organic carbon. Soil pH and CaCO3 contents were negatively correlated with DTPA extractable micronutrient cations, whereas, organic matter and clay content positively correlated. The step down multiple regression analysis indicated that pH, EC, OC and clay content influenced 85, 61, 69 and 55 per cent variation in DTPA- Zn, Cu, Fe and Mn, respectively.
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