Vol. 18 No. 3
Nitrogen mineralisation of green manure crops during rabi – a relative analysis
Author(s): M. SANJANA, G. S. MADHU BINDU, B. PADMAJA, M. UMA DEVI AND S. TRIVENI
The relationship between the nitrogen content, biomass produced by the green manure crops (green gram, black gram, horse gram, cowpea, sunhemp, dhaincha and pillipesara) and the soil microbial communities with the nitrogen mineralization of the green manure residues at 20 and 40 days after incorporation (DAI) during rabi was studied at College of Agriculture, Rajendranagar, Hyderabad. The relative analysis indicated that the nitrogen content of the green manure crops had a strong positive relation with both NH4 +-N (ammonical nitrogen) and NO3 —N (nitrate nitrogen) mineralization at both the periods of observations (20 and 40 DAI). Similarly, the biomass produced by the green manure crops was found to be more strongly related to both NH4 +-N and NO3 --N mineralization. Both the nitrogen fractions (NH4 +-N and NO3 --N) released were positively and strongly related to microbial population up to 40 DAI.