Journal of FARM SCIENCES, Vol 25, No 2 (2012)

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Nutrient status of soil under different nutrient and crop management practices

Vidyavathi ., G.S. Dasog, H.B. Hebsur, S.K. Gali, S.G. Patil, A.R. Alagawadi

Abstract


A field experiment was conducted during kharif and rabi seasons of 2007-08 at UAS, Dharwad, Karnataka to study the effect of organic, chemical and integrated nutrient management(INM) practices on soil fertility status in soybean-wheat, groundnut-sorghum, maize-chickpea, potato-chickpea and chilli+cotton systems. The present study was the fourth year of long term field experiment (LTFE) of Network Project on Organic Farming at Institute of Organic Farming, UAS, Dharwad. After harvest of kharif crops of fourth year (2007-08), the integrated nutrient management practice recorded significantly higher available N (278.4 kg/ha), P2O5 (23.4 kg/ha), K2O (355.0 kg/ha) and S (18.7 kg/ha) when compared to chemical nutrient management practice. Similarly, DTPA extractable Zn, Fe, Mn and Cu were significantly influenced by integrated nutrient management practice (1.46, 7.96, 9.67 and 0.89 mg/kg, respectively). At the end of fourth of LTFE, there was increase in available N by 19.0, P2O5 by 46.3, K2O by 9.6 and S by 54.1 per cent respectively due to INM. Similarly DTPA extractable Zn, Fe, Mn and Cu increased by 18.5, 30.6, 36.5 and 30.0 per cent respectively due to integrated nutrient management practice over their initial values. The available N, P2O5, K2O and S were significantly higher in legume based cropping systems during both the season of the study than non legume system

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