No abstract

No abstract

No abstract

No abstract

No abstract

Residual effect of crop residues along with green manure, microbial culture and inorganic fertilizer on yield and soil properties of wheat grown after rice were studied. The following treatments such as control, straw burn (5 t ha -1 ) , straw incorporation (5 t ha -1 ), straw (5 t ha -1 ) + 25% N of recommended dose , straw (5 t ha -1 ) + green manure (5 t ha -1 ) and straw (5 t ha -1 ) + microbial culture (a cocktail of Aspergillus, Trichoderma, Pleurotus and Phanerochaete) were imposed on rice and their residual effects on the yield of wheat and nutrients content in soils were evaluated. Results showed that application of straw (5 t ha -1 ) + green manure (5 t ha -1 ) recorded the highest yield of wheat followed by the straw (5 t ha -1 ) + 25%N of recommended dose > straw (5 t ha -1 ) + microbial culture > straw incorporation (5 t ha -1 ) > straw burn (5 t ha -1 ) > control. Availability of soil nutrients particularly N, P, K and organic carbon also increased following the above trend.

Studying the dynamics of soil organic carbon (SOC) is important for understanding the mechanistic pathways of C stabilization into different SOC pools. An attempt was, therefore, made to assess the impact of double rice cropping system with different levels of fertilizers and in combination with organics on C sequestration and its stabilization in an Inceptisol using a 14-year old experiment at Jagtial under semi-arid climate in India.Total organic carbon (TOC) allocated into different pools in order of very labile > less labile > non labile > labile, constituting about 41.4, 20.6, 19.3 and 18.7%, respectively. In comparison with control, system receiving farmyard manure (FYM-10 Mg ha -1 season -1 ) alone showed greater C build up (40.5%) followed by 100% NPK+FYM (120:60:40 kg N,P,K ha -1 +5 Mg FYM ha -1 season -1 )(16.2%). In fact, a net depletion of carbon stock was observed with 50% NPK (-1.2 Mg ha -1 ) and control (-1.8 Mg ha -1 ) treatments. Only 28.9% of C applied through FYM was stabilized as SOC. A minimal input of 2.34 Mg C ha -1 y -1 is needed to maintain SOC level.Treatments with organics showed a higher carbon management index, and microbial biomass and other labile pools of SOC. Results also indicated that100% NPK+FYM could maintain yield sustainability with a lower cost of carbon sequestration.

No abstract