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Long term effect of organic, integrated and inorganic nutrient management practises on soil properties in a Vertisol

A long term experiment on paddy for eleven years ( 2005-06 to 2016-17) was conducted on a clayey textured Vertisol at Agricultural Research Station, Gangavati, UAS, Raichur to compare the influence of organic and conventional farming systems on soil physical, chemical and biological properties of soil with the following treatments viz., T1: 100 % N through organics, T2: 75 % N through organics,T3: Integrated N management (50 % N through organics & 50 % N through organics), T4: 100 % N through inorganics along with FYM @ 7 t/ha, T5: 100 % RDF (150: 75:75 kg/ha).The experiment was laid out in a Randomized Block Design and treatments were replicated four times. Results revealed there was no such variation in physical properties of soil, particularly, bulk density and penetration resistance but maximum water holding capacity of soil differed significantly with different farming systems. The higher organic carbon content of 0.85 per cent was recorded due to 100 per cent substitution of N to paddy crop through organics. Available N (228 kg/ha-1 ) was higher in treatment containing complete organic farming treatment whereas higher available P and K (55.87 & 688.4 kg/ha-1 ) in treatment receiving 100 per cent N through in-organics along with FYM @ 7 t/ha. The DTPA extractable micronutrients Fe, Mn, Zn and Cu were significantly higher in treatment consisting of 100 per cent organics (7.4, 4.43, 0.73 and 0.56 ppm, respectively). | Long term effect of organic, integrated and inorganic nutrient management practises on soil properties in a Vertisol