Changes in soil fertility status of maize-wheat system due to long-term use of chemical fertilizers and amendments in an alfisol
2012
Verma, G., Regional Research Station, Gurdaspur (India) | Sharma, R.P., Chaudhary Sarwan Kumar Himachal Pradesh Agricultural Univ., Palampur (India). Dept. of Soil Science | Sharma, S.P., Chaudhary Sarwan Kumar Himachal Pradesh Agricultural Univ., Palampur (India). Directorate of Research | Subehia, S.K., Chaudhary Sarwan Kumar Himachal Pradesh Agricultural Univ., Palampur (India). Dept. of Soil Science | Shambhavi, S., Chaudhary Sarwan Kumar Himachal Pradesh Agricultural Univ., Palampur (India). Dept. of Soil Science
The present study was undertaken to quantify changes in the status of soil nutrients, their depletion and build-up after continuous long intensive cropping for last 36 years in a permanent manorial trial which has been in progress since 1972 in an alfisol of western Himalayas. The rotation was maize-wheat which included various combinations of N, P, K, Zn and farmyard manure (FYM). Continuous cultivation influenced pH, organic carbon, available N, P and K. An increase in the status of organic C was observed in 100% NPK + FYM treatments for more than three decades from the initial value of 7.9 to 12.0 g/kg. The use of either FYM or lime along with 100% NPK sustained crop productivity or improved nutrient status. However, imbalanced use of nutrients, i.e. NP or N alone, is adversely affecting the fertility of soil by aggravating the problem of soil acidity. Application of S free P fertilizer DAP (diammonium phosphate) drastically reduced the yield of both the crops. Thus, continuous use of balanced fertilizers is necessary for sustaining soil fertility and productivity of crops.
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