1. Identifying systems for carbon sequestration and increased productivity in semi-arid tropical environments

2. Collaborating Scientists within Institutions Principal Investigator Dr. S.P.Wani, ICRISAT ICRISAT CCPI: Dr. T.J.Rego Dr. K.P.C. Rao Mr. P. Pathak Dr. Piara Singh NBSS & LUP Dr. Tapas Bhattacharyya Dr. P. Chandran DR. S.K. Ray Dr. (Mrs.) C. Mandal Dr. D.K. Pal Dr. M.V. Venugopalan Mr. S.L. Durge Dr. P. Srivastava CRIDA Dr. V. Ramesh Dr. K.L. Sharma DR. M. Vanaja IISS Dr. M.C. Manna Dr. K. Bandyopadhyay DR. T.R. Rupa

3. Objectives Identify the potential carbon sequestration production systems in the SAT benchmark sites and establish relationship amongst different factor with the carbon stock and systems productivity. Evaluate validate the existing simulation models for predicting the performance of different systems for carbon sequestration.

4. NBSS & LUP §MINEROLOGY OF CLAY + SILT §SMECTITE QUANTITY §BULK DENSITY §PARTICLE SIZE DENSITY §STRUCTURE §HC §COLE §pH §CEC §Org. C §EC §Extractable Cations §Inorganic C §CaCO 3 §CO 2 Clay §Site characteristics IISS §WSA §WSC §WS Carbon §POM §Passive pools §DHA §Available P CRIDA §Available S §Total P reading §Total S reading §Meteorological §Agronomic §Infiltration §Respiration ICRISAT §WHC §Organic C §Total P §SMBC §SMBN §Respiration §Net N mineralisation §Total N §Available N §Plant C & N Responsibilities of participating institutions for soil sample analysis

5. Work Program Module 1 Methodology and requirements definition Module 2 Resource inventory/database development Module 3 Assessing carbon stock/balance Module 4 Processes related to C sequestration

6. Module 5 Modeling requirements Module 6 Model adaptation and validation Module 7 Identification of promising practices Module 8 Techno-economic feasibility of new strategies

7. Progress §Benchmark sites identified (17 sites covering 32 spots) §Site characteristics and information on soils and management practices collected for each site §Soil samples collected (horizon wise) for analysis of physico-chemical and biological properties

8. Work carried out for following Parameters l Moisture retention characteristics l Mean weight diameter(MWD) l Particle size distribution l Water dispersable clay l Carbonate clay l Coefficient of linear extensibility l Hydraulic Conductivity l Bulk density l Soil reaction, EC l Calcium carbonate l Cation exchange capacity

9. l Total Carbon l Soil organic Carbon l Fractions of soil Carbon l Mineral N l Total N l Available P l Total P l Available S l Activity of Dehydrogenase l Microbial biomass C and N l Soil respiration l Net N

10. Modeling work §Identified CENTURY model to assess carbon stocks at all locations targeted by this project §Identified APSIM and DSSAT crop growth models to assess the changes in soil productivity associated with changes in soil carbon §Work on calibration of century model initiated Response of crops to elevated CO 2 under controlled conditions Cereals, pulses and oilseed crop germination experiments under elevated CO 2 conditions to assess the performance of different rainfed crops and quantify the soil respiration rates