Yield Gap Analysis of Major Rainfed Crops of Northern Vietnam Using Simulation Modeling. Global Theme on Agroecosystems Report No. 26 uri icon


  • Total population of Vietnam is 82 million as of today. It is expected to increase to 95 million by 2010 and126 million by 2020. With increasing demand for food in future, the pressure on uplands and midlands ofnorthern Vietnam would increase to produce more food for millions of poor residing in Vietnam. Majorcrops of northern Vietnam are rice, sweet potato, maize, tea, peanut and soybean, in addition to otherannual and perennial crops. The current study investigated the potential yields; yield gaps and water balanceof maize, peanut and soybean crops, which have high potential in the region. We used crop simulationmodels of the three crops and the field data to evaluate the scope for increasing productivity and waterharvesting in the six selected provinces of northern Vietnam. Analysis of the production data revealed thatsince 1994?95 the area, production and productivity of these crops have increased substantially. Improvementsin productivity have been obtained with the introduction of improved crop varieties and management practices.However, large yield gaps still exist which are variable among districts and provinces. Overall, the yield gapis 1010 kg ha-1 for summer season and 680 kg ha-1 for spring season for soybean; 2650 kg ha-1 for springseason and 2010 kg ha-1 for autumn season for peanut; and for maize it is 1990 kg ha-1 for summer season and1650 kg ha-1 for spring season, indicating the potential for future yield improvements. Because of highrainfall in northern Vietnam, significant amount of surface runoff and deep drainage occurs leading to landdegradation. The vast potential of the rainfed areas of northern Vietnam could be harnessed through large-scale adoption of integrated genetic and natural resource management technologies in watershed contextfor increasing productivity and reducing land degradation

publication date

  • 2006