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Effect of integrated nutrient management strategies on nutrient status and soil microbial population in aonla (Emblica officinalis Gaertn.) Cv. Na-7

The present study on the integrated nutrient management in aonla involved application of inorganic fertilizers, FYM and Azotobacter under different combinations during 2016 and 2017 on ten year old plant of aonla cv. NA-7. Leaf and fruit study were analyzed to determine the status of different nutrients and soil microbial population in aonla. The two years pooled data analysis revealed that highest concentration of leaf and fruit nitrogen (2.78 and 0.14%), phosphorous (0.22% and 0.030%), calcium (2.33% and 0.031%) and magnesium (0.47 and 0.020%) resulted with the combined application of Azotobacter + 25% nitrogen as FYM and 75% nitrogen as urea. While highest leaf and fruit potassium (2.44 and 0.30%) were recorded with 50 % nitrogen through FYM + 50 % nitrogen through urea along with Azotobacter. Maximum Azotobacter counts (27.3 × 104 cfu g soil), bacterial counts (28.5 × 106 cfu g soil) and fungal counts (24.9 × 105 cfu g soil) were recorded with the application of full doze of nitrogen through FYM along with Azotobacter. The results suggested that fertilization of aonla with chemical fertilizers can be minimized when 25 per cent nitrogen is applied with FYM and 75 per cent with urea augmented with Azotobacter. | Effect of integrated nutrient management strategies on nutrient status and soil microbial population in aonla (Emblica officinalis Gaertn.) Cv. Na-7