Comparative analysis of local and improved practices used by farmer seed production schools in Vietnam

Abstract Farmer seed production schools in combination with participatory field experimentation might be effective instruments to enhance the skills of farmers to produce high-quality seed in the informal seed system in Vietnam. Four hundred twenty nine, unreplicated on-farm experiments were carried out in four different provinces and analyzed by the farmer seed production schools. These experiments consisted of two adjacent seed production plots: one with common local practice and one with improved practice. Differences between the two plots in yield and profit were assessed. Averaged across provinces, yields of the “improved practice plots” were 0.43 Mg ha −1 higher in the wet season and 0.78 Mg ha −1 higher in the dry season than the “local practice plots”. In the Nam Dinh and Nghe An provinces more hills per m 2 , more input of potassium and muck, and fewer seedlings per hill at transplanting contributed to the higher yields in the “improved practice plots”. In the provinces Binh Dinh and Dong Thap, using a drum seeder for sowing, reduced seed rate, less input of nitrogen fertilizer and more potassium contributed to the yield advantage of the “improved practice plots”. The profit of the improved practice plots was 212 US$ ha −1 higher than the profit in the local practice plots. Rice growers can benefit from lower seed rates, better yields and higher prices when grains are sold as seeds. These findings may direct the seed policies and extension approaches in Vietnam.