Melkania, UmaPrakriti Kumari2019-08-282019-08-282019-06http://krishikosh.egranth.ac.in/handle/1/5810124410Crop residue burning is one of the reasons for climate change and increase in green house gas emissions into the atmosphere. Farmers usually face problems to manage crop waste generated after harvesting. Short window of time is present between harvesting of paddy and sowing of wheat. Farmers are left with no choice besides burning it in the field itself. This causes huge loss of beneficial organisms present in soil and causes changes in the soil physico-chemical characteristics of top layer of soil. Air pollution has increased to a greater extend due to this reason. Biochar is good alternative to manage crop residue burning. Biochar is prepared in controlled environment which prevent emissions of harmful gases into the atmosphere. Biochar also have many benefits in soil as it increases carbon content in soil which further increases soil fertility. It also prevents leaching of nutrients from the soil. Biochar has liming effect on soil and can be used as alternative to lime to prevent acidity in soil. Carbon stock generated by biochar plus recommended dose of fertilizers was 17.76 t/ha which was 20.07% more than control. Carbon stock produced by crop treatment crop residue and fertilizers was 17.39 t/ha. Labile carbon is converted to non-labile form by biochar which is resistant to decomposition and persists in soil for many years. Therefore, it works as attractive tool to conserve carbon for long term. Carbon nonlabile amount in biochar and fertilizer treated soil was 6.624 g/kg and labile carbon was 5.655 g/kg. In control labile carbon fraction was 5.85 g/kg and non-labile fraction was 3.19 g/kg. Carbon lability index of treatment of biochar and fertilizers was recorded to be 0.85 and crop residue and fertilizers treatment was noted as 2.09. Low carbon lability index of biochar is due to more non-labile fraction of soil organic carbon. Due to this property carbon can be sequestered for many years in soil. The study concluded that biochar has great potential to sequester carbon and manage crop residue burning which will prevent emissions of various gases into the atmosphere due to burning.ennullThesis