Abstract
To make a comparative study on the impact of green manure (legume, non legume and weed species) and inorganic fertilizer on crop yield and fertility status in soil an experiment was conducted for two successive years in shifting cultivation areas of Assam. Among the different green manure studied maximum yield of rice was recorded in legume green manure (1687.6 kg kgh-1) followed by inorganic fertilizer (1566.6 kgh-1) applied plot in initial year. However during successive year productivity was recorded low in fertilizer applied plot compared legume, non legume and weed green manure. Same trend was noticed in productivity of Maize also. Significant increase of nutrient uptake was observed in green manure treated plot. Fertilizer applied plot showed low value during successive year. Acidity of the soil increased due to release of organic acid during decomposition of green manure. Input of biomass to the soil contributed in increment of organic carbon, nitrogen and other mineral nutrients and thus maintaining productivity as well as fertility status in soil.
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