[1] Leibniz Univ Hannover, Inst Environm Econ & World Trade, Hannover, Germany
[2] Int Maize & Wheat Improvement Ctr, South Asia Reg Off, Kathmandu, Nepal
[3] Tennessee State Univ, Coll Agr, Dept Agr & Environm Sci, Nashville, TN USA
[4] Asian Dev Bank Inst, Chiyoda ku, Tokyo, Japan
[5] Int Maize & Wheat Improvement Ctr CIMMYT, Dhaka, Bangladesh
[6] Cornell Univ, Sch Integrat Plant Sci, Soil & Crop Sci Sect, Ithaca, NY USA
[7] Tennessee State Univ, Coll Agr, Dept Agr & Environm Sci, 204D Farrell Westbrook Complex,3500 John A Merritt, Nashville, TN 37209 USA