IMPACT OF CLIMATE CHANGE ON THE DECOMPOSITION AND NITROGEN RELEASE PATTERN OF ORGANIC MATTER

Crop residues and Farm Yard Manure (FYM) are the most important sources of soil organic carbon and releases nutrients that help to maintain the soil fertility. A pot culture experiment was conducted in Temperature Control Chamber (TCC) at Agro Climate Research Centre (ACRC), Tamil Nadu Agricultural University, Coimbatore to study the nutrient release pattern of organic matter under projected climate change viz., elevated temperature (+2oC) and moisture stress (drought - 60% ET, Excess - 140%) in addition with microbial addition. Necessary control viz., ambient temperature and no moisture stress (100%ET) was maintained under FCRD design with two replications. The study on impact of elevated temperature, moisture stress and microbial addition on organic matter decomposition and nitrogen release pattern could be concluded that the nitrogen release pattern was decreased with the elevated temperature and moisture stress. The elevated temperature stress could be sustained by proper soil moisture management and the addition of microbes could sustain the drought stress. Farm Yard Manure (FYM) releases more nitrogen than stover under ambient and elevated temperature (+2oC), due to quicker microbial action. The stover releases the nitrogen slowly and the N availability increased after 60 DAI under both ambient and elevated temperature without moisture stress. This study had demonstrated that FYM would increase the nitrogen availability under elevated temperature and moisture stress than stover