Soil N-mineralization dynamics under four major land use patterns in Eastern Himalaya
Keywords:
Autotrophic nitrifiers, Immobilization, Microbial activities, N-mineralization, Sustainable agriculture.Abstract
N-mineralization, nitrification and ammonification rates were studied in the major land use patterns viz., Jhum, agroforestry, vegetable and millet agro-ecosystems (AES) in East Siang district of Arunachal Pradesh, north-east India. Study was conducted for an annual cycle from June 2011 to May 2012 following standard methodology. N-mineralization showed significant variations between the sites and seasons. Greater amount of N-mineralization was recorded during the rainy season for agroforestry, and winter season for Jhum, vegetable and millet AES. Lowest mineralization rates were found during the spring for Jhum AES and during the rainy season for millet and vegetable AES. Ammonification rate was positively correlated with soil pH, soil organic carbon, NH4 +-N and NO3-N whereas, nitrification rate was negatively correlated with ammonium and nitrate concentrations which suggest that available nitrogen concentration was not saturated in these systems.Downloads
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