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Imbalanced application of inorganic fertilizer generates undesirable over soil physicochemical properties to a great extent. Short term aerobic incubation experiment was implemented with soil samples (Typic Haplustert) collected from top soil horizon (0-15cm) of cabbage field in Viraliyur, Coimbatore district of Tamil Nadu. Intention of study is towards examining the pattern of changes in soil pH and EC in soil added with varied levels of fertilizers (NPK) under field capacity condition. Fertilizer was applied in accordance with the treatments viz., control (no fertilizer), 100 % of RDF (100:125:25), 125% of N + Recommended PK, 150% of N + Recommended PK, 125% of P + Recommended NK, 150% of P + Recommended NK, 125% of K + Recommended NP, 150% of K + Recommended NP. Fertilizers source used were urea, diammonium phosphate (DAP) and muriate of potash (MOP). Experimental soil was characterized for its physico-chemical. The pH was neutral in reaction and EC level was in safer limit. Incubation period was extended for two months. Destructive sample from each set of container was taken at weekly intervals for analysis of pH and EC. From the experimental results, no significant changes in the pH and EC was recorded during the first three weeks of incubation. The acidification was most pronounced in soil receiving urea at 125 and 150 per cent recommended level. The slight change in pH and electrical conductivity was noticed after third week of incubation. A prominent change in soil reaction was induced by the urea applied at the rate of 150% + Rec PK in comparison with other treatments. Salinity levels was greatly influenced in the DAP treated soils.

Geo referenced soil survey was undertaken in rice growing areas of Thondamuthur Block, Coimbatore district of Tamil Nadu. The main aim of this study was to carry out the evaluation of soil fertility and fertilization practices being followed by the rice growing farmers of the selected villages in Thondamuthur block. Soil samples (50 Nos) were collected from with an auger from a depth of 0-15 cm and analyzed for pH, electrical conductivity, organic carbon, available macro and micro nutrients using standard analytical methods. These data were used to spot the range of critical soil available nutrient and the relationships among the soil fertility parameters. Based on the results obtained, soil reaction was neutral to alkaline in nature. With respect to salinity, 16 % of the soils from Muttathuvayal village alone were slightly saline and remaining 84 % of the soil samples were non saline. Almost 80 per cent of the villages fall under the medium category of soil organic carbon content. Results indicated that 54 percent of the samples are low to medium in available nitrogen; for Olsen P, it was 90 percent in high status; and about 80 per cent of the samples were medium in NH4OAc -K. Except Cu, other micronutrients were deficient. From the nutrient index, Cu was above sufficiency range, P and Fe were found to be adequate and the other elements were deficit in soil.

Imbalanced application of inorganic fertilizer generates undesirable over soil physicochemical properties to a great extent. Short term aerobic incubation experiment was implemented with soil samples (Typic Haplustert) collected from top soil horizon (0-15cm) of cabbage field in Viraliyur, Coimbatore district of Tamil Nadu. Intention of study is towards examining the pattern of changes in pH and electrical conductivity (EC) in soil added with varied levels of fertilizers (NPK) under field capacity condition. Fertilizer was applied in accordance with the treatments viz., control (no fertilizer), 100 % of RDF (100:125:25), 125% of N + Recommended PK, 150% of N + Recommended PK, 125% of P + Recommended NK, 150% of P + Recommended NK, 125% of K + Recommended NP, 150% of K + Recommended NP. Fertilizers source used were urea, diammonium phosphate (DAP) and muriate of potash (MOP). Experimental soil was characterized for its physicochemical. The pH was neutral in reaction and EC level was in safer limit. Incubation period was extended for two months. Destructive sample from each set of container was taken at weekly intervals for analysis of pH and EC. From the experimental results, no significant changes in the pH and EC were recorded during the first three weeks of incubation. The acidification was most pronounced in soil receiving urea at 125 and 150 per cent recommended level. The slight change in pH and electrical conductivity was noticed after third week of incubation. A prominent change in soil reaction was induced by the urea applied at the rate of 150% + Rec PK in comparison with other treatments. Salinity levels was greatly influenced in the DAP treated soils.