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Yield gap analysis of major rainfed crops of Northern Vietnam using simulation modeling

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677-2005.pdf3.62 MB
Chuc, N.T.; Ramakrishna, A. ; Srinivas, K. ; Long, T.D. ; Singh, P. ; Chinh, N.T. ; Thang, N. V. ; Wani, S.P.,( Suhas P. Wani ) ; International Crops Research Institute for the Semi-Arid Tropics ; Asian Development Bank ; Comprehensive Assessment of Water Management in Agriculture
Publication Year: 
Publisher Details: 
Patancheru, Andhra Pradesh, India; Manila, The Philippines; Colombo, Sri Lanka : International Crops Research Institute for the Semi-Arid Tropics; Asian Development Bank, Comprehensive Assessment of Water Management in Agriculture
Report/Series/Bulletin Name: 
Global Theme on Agroecosystems
Report/series/Bulletin Number: 
Report no : 26

Total population of Vietnam is 82 million as of today. It is expected to increase to 95 million by 2010 and 126 million by 2020. With increasing demand for food in future, the pressure on uplands and midlands of northern Vietnam would increase to produce more food for millions of poor residing in Vietnam. Major crops of northern Vietnam are rice, sweet potato, maize, tea, peanut and soybean, in addition to other annual and perennial crops. The current study investigated the potential yields; yield gaps and water balance of maize, peanut and soybean crops, which have high potential in the region. We used crop simulation models of the three crops and the field data to evaluate the scope for increasing productivity and water harvesting in the six selected provinces of northern Vietnam. Analysis of the production data revealed that since 1994-95 the area, production and productivity of these crops have increased substantially. Improvements in 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 gap is 1010 kg ha-1 for summer season and 680 kg ha-1 for spring season for soybean; 2650 kg ha-1 for spring season and 2010 kg ha-1 for autumn season for peanut; and for maize it is 1990 kg ha-1 for summer season and 1650 kg ha-1 for spring season, indicating the potential for future yield improvements.Because of high rainfall in northern Vietnam, significant amount of surface runoff and deep drainage occurs leading to land degradation. 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 context for increasing productivity and reducing land degradation.

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