A Study on Available Macronutrients and Their Effects on Soil of Sola Reserve, Forest of Sivasagar, District

Sola reserve forest of Sivasagar district is one of the important unit of northeast biogeographic zone specially in phytodiversity. Soil play a vital role in the development of forest canopy. The major macronutrients are nitrogen, phosphorus, potassium, calcium, magnesium and sulphur. Analytical studies of most of the macronutrients and soil pH were performed in the NBSS and LUP (ICAR) laboratory, Jorhat, Assam. Drilling operation of ONGCL is a major threat to the biodiversity of the area. Soil contamination of crude oil is a common phenomena of the locality, therefore, some results were found not satisfactory. Certain endangered and threatened medicinal plants are found. Environment Management and Pollution Control Dept. have set up by ONGC for achieving zero pollution in the drilling, production and other allied activities. ETP is the main control measure.