A Review of the Evidence - Search CIMMYT repository

Given this variability, we are reluctant to suggest a single, universally applicable rule ofthumb for use in applied research impacts work. Instead, we conclude that the productivitygains attributable to MV adoption are best estimated on a case-by-case basis, taking intoaccount the specific circumstances, including the type of germplasm involved, theproduction environment, and farmers’ seed and crop management practices. In thecomplete absence of location-specific data on incremental yield gains attributable to MVadoption, however, the following assumptions seem reasonable:♦ improved OPV replacing a landrace: 25% average yield gain;♦ improved OPV replacing an older improved OPV: 15% average yield gain;♦ hybrid replacing a landrace: 50% average yield gain;♦ hybrid replacing an improved OPV: 25% average yield gain;♦ hybrid replacing an older hybrid: 15% average yield gain.61