Author(s):

DS Jakhar, Vinod Kumar and Sunil Beniwal

Abstract: As commercial fertilizers are becoming more costly, legume residues can serve as an alternative in increasing soil available nutrients for increased crop productivity. But in order to optimize the use of legume residues there is need to estimate their mineralization rate after being incorporated in the soil. Keeping in view the above, a screen house and laboratory experiment was conducted to study carbon and nitrogen mineralization pattern in soil amended with different legume residues. Four levels of N viz. 40, 80,120,160 mg N Kg-1 soils were applied through urea and legume residues. In laboratory, carbon and nitrogen mineralization from legume residues was studied at 7, 14, 28, 42 and 56 days incubation period. Carbon Mineralization expressed as percent of added carbon mineralized increased at a faster rate up to 28 days of incubation and attained a slower rate at 42 and 56 days in all the treatments. Amongst the legume residues, the percent of carbon mineralized in different treatments followed the decreasing trend as: pigeonpea>green gram>black gram>clusterbean>soybean>cowpea. The amount of nitrogen mineralized increased with incubation period. Highest mineralization was reported during early periods and decreased thereafter. After 56 days of incubation the magnitude of N mineralized (% of added N) was in order: Pigeonpea>greengram>blackgram>soybean>cowpea.

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