Efficiency impacts of research investments in a few projects under the National Agricultural Technology Project (NATP) have been estimated using the economic surplus approach. The model has been applied in a closed economy framework with the assumption of no spillover effects. The quantified economic pay-offs of these impacts in terms of NPV, IRR, and benefit-cost ratio for most of the technologies have been found quite attractive. Besides, there are indications of impacts on sustainability of the production systems. It has been concluded that returns to investment on dissemination of available technologies are enormous and therefore should receive immediate attention.