Abstract— To study the long term effect of integrated nutrient management on soil properties and available nutrients, surface and subsurface soil samples were drawn from the long-term field experiment (LTFE) which is in progress on a Typic Hapludalfs at Research Farm of College of Agriculture, CSK HPKV, Palampur, Himachal Pradesh, India since Rabi, 1972. The rotation followed was maize-wheat and the treatments included various combinations of N, P, K, Zn, lime, hand weeding and farm yard manure. Results from the study showed that integrated nutrient management over the years resulted in improvement in the soil properties as well as status of available nutrients in the soil at both the depths. Continuous application of urea as a source of N has resulted in acidification of soils (pH 4.3) while lime application increased the pH to 6.2 in the surface soil and 6.0 in subsurface soil. The treatment 100 % NPK + FYM resulted in 66 per cent increase in soil organic carbon content over initial value. Similar effects were recorded on cation exchange capacity and available nutrients. It can be concluded from the study that integrated nutrient management is essential to maintain soil health.
Keywords— Integrated nutrient management, soil properties, long-term effect.
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