Effects of ecological conditions and technical factors on efficiency of winter maize on wetland in the cropping systems of the red river delta in North Vietnam
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TextPublication details: Los Baños, Laguna (Philippines) PCARRD : 2000Description: p. 423-429Subject(s): Summary: Rotation with winter maize after two rice crops in the wet lands of North Vietnam, is becoming a common practice since 1983 and up to now. Average temperature and hours of sunshine per day, in North Vietnam were found to be closely correlated with yield. Their relationship is described by the following model: y (yield) = 0.5t + 0.9N + 1.7, where t and N is average temperature (OC) and hours of sunshine (hours) per day respectively; ryN = 0.75 and ryt = 0.87. Thanks to the successful cultivation of hybrid maize during winter, the winter maize acreage after two crops of ric~ is expanding gradually, from 50,000 has in 1983 to 117,000 has in 1987 and 140,000 has in 1997. The great change in acreage of winter crops in the Red River, Delta did not change much the demand of irrigation water in the whole year for the Sa;lne naturallarid area. However, with a frequency of 25% typhoon and storms occurring by the end of September, winter maize acreage on wet land can fluctuate. Generally, damage by insects and diseases on winter maize in North Vietnam is not as heavy as those on spring and Summer -Autumn maize crops. The efficiency of 60 kg K2O per ha in the Red River Delta was found to increase 0.65- 1.1 tons of summer rice, but produced an increase of 0.9 -3.76 tons of winter maize, depending on whether additional compost is applied or not. Effects of winter maize on the two rice crops can be seen in Thai Binh province, where total production per ha in 1993 was 13.63 tons and increased to 16.21 tons in 1996. Farmers producing hybrid maize can benefit from a higher wage (12,460 VND per day) than those used for potatoes (10,550 VND) and sweet potatoes (9,300 VND). Thus winter maize on wet land in Vietnam can be sustainable in the cropping systems in the Red River Delta.
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Rotation with winter maize after two rice crops in the wet lands of North Vietnam, is becoming a common practice since 1983 and up to now. Average temperature and hours of sunshine per day, in North Vietnam were found to be closely correlated with yield. Their relationship is described by the following model: y (yield) = 0.5t + 0.9N + 1.7, where t and N is average temperature (OC) and hours of sunshine (hours) per day respectively; ryN = 0.75 and ryt = 0.87. Thanks to the successful cultivation of hybrid maize during winter, the winter maize acreage after two crops of ric~ is expanding gradually, from 50,000 has in 1983 to 117,000 has in 1987 and 140,000 has in 1997. The great change in acreage of winter crops in the Red River, Delta did not change much the demand of irrigation water in the whole year for the Sa;lne naturallarid area. However, with a frequency of 25% typhoon and storms occurring by the end of September, winter maize acreage on wet land can fluctuate. Generally, damage by insects and diseases on winter maize in North Vietnam is not as heavy as those on spring and Summer -Autumn maize crops. The efficiency of 60 kg K2O per ha in the Red River Delta was found to increase 0.65- 1.1 tons of summer rice, but produced an increase of 0.9 -3.76 tons of winter maize, depending on whether additional compost is applied or not. Effects of winter maize on the two rice crops can be seen in Thai Binh province, where total production per ha in 1993 was 13.63 tons and increased to 16.21 tons in 1996. Farmers producing hybrid maize can benefit from a higher wage (12,460 VND per day) than those used for potatoes (10,550 VND) and sweet potatoes (9,300 VND). Thus winter maize on wet land in Vietnam can be sustainable in the cropping systems in the Red River Delta.
English
0208|AGRIS 0201|AL-Maize Program|R01PROCE
Juan Carlos Mendieta
CIMMYT Publications Collection