31. The report blames the slow progress on low agricultural productivity  and poor infrastructure in developing countries. 32. Although still a small percentage, any increase helps to facilitate a continued rise in agricultural productivity . 33. Whelan said although agricultural productivity  in Africa had increased, the number of people has increased faster. 34. Agricultural productivity  may also be measured by what is termed total factor productivity ( TFP ).35. The challenge now, he said, will be to double agricultural productivity  without using substantially more land. 36. Agricultural productivity  under the Derg continued to decline.37. Globally, the medical advances and massive increase in agricultural productivity  made possible by the Green Revolution. 38. But " in Africa, however, no comparable gains per caput agricultural productivity  have taken place ." 39. This is one of the reasons that agricultural productivity  has not grown enough in the past. 40. We are mostly farmers and with disease comes a decline in agricultural productivity , " he said.