Potatoes: Production, Marketing, And Programs For Developing CountriesInternational Potato Center, 23 thg 4, 1987 - 243 trang World patterns and trends in potato production and use; The potato crop and its physical environment; The socioeconomic environment: Levels of development and public policies; Supply, demand, and marketing; Potato nutrition and consuption; Potato production systems; Research priorities and potato programs; Impact of potato programs; Summing up. |
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Kết quả 1-5 trong 38
Trang 24
... field crops . Production of dry matter , edible energy , protein , and monetary value can also be used to measure the total production of food crops ( Table 7 ) . In terms of the first three , the potato ranks ninth . But when all ...
... field crops . Production of dry matter , edible energy , protein , and monetary value can also be used to measure the total production of food crops ( Table 7 ) . In terms of the first three , the potato ranks ninth . But when all ...
Trang 28
... field vegetatively ( as tubers ) from one season to the next . Some farmers in such widely dispersed locations as Ireland , Newfoundland , Peru , Guatemala , the Hi- malayas , and Rwanda leave some tubers in the ground to serve as seed ...
... field vegetatively ( as tubers ) from one season to the next . Some farmers in such widely dispersed locations as Ireland , Newfoundland , Peru , Guatemala , the Hi- malayas , and Rwanda leave some tubers in the ground to serve as seed ...
Trang 34
... field are infected with an aggressive virus like potato leaf roll virus , yields may be cut by more than 50 percent . Andean varieties ( S. tuberosum andigena ) , which produce abundant foliage , are normally less affected by virus ...
... field are infected with an aggressive virus like potato leaf roll virus , yields may be cut by more than 50 percent . Andean varieties ( S. tuberosum andigena ) , which produce abundant foliage , are normally less affected by virus ...
Trang 39
... fields , a few generalizations can be made . Nitrogen stimulates growth of foliage and delays tuber formation . Hence , a well - fertilized crop will mature later in the season and yield more than one with less nitrogen . If harvested ...
... fields , a few generalizations can be made . Nitrogen stimulates growth of foliage and delays tuber formation . Hence , a well - fertilized crop will mature later in the season and yield more than one with less nitrogen . If harvested ...
Trang 40
... field crops , including potatoes , be planted on level land rather than on hillsides to minimize erosion and take advantage of fertile valley - bottom soils . Where slopes must be cultivated , planting on horizontal " contour lines " is ...
... field crops , including potatoes , be planted on level land rather than on hillsides to minimize erosion and take advantage of fertile valley - bottom soils . Where slopes must be cultivated , planting on horizontal " contour lines " is ...
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Potatoes: Production, Marketing, And Programs For Developing Countries Douglas Horton Xem trước bị giới hạn - 2019 |
POTATOES: Production, Marketing, and Programs for Developing Countries DOUGLAS. HORTON Không có bản xem trước - 2019 |
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Africa agricultural agricultural research America areas average Bangladesh blight breeding capita Central cereals changes commodity consumers costs crop cultivation demand depends developing countries diseases early economic effect estimates Europe example expand farmers farms fertilizers field food crops growing grown growth harvest hectare higher highland impact important improved income increase India inputs insect institutions International Potato Center land late less levels Lima limited losses lower lowland major Mantaro Valley needs North percent period Peru pests plant policies population potato consumption potato crop potato prices potato production potato programs practices priorities problems processing projections rates reduce regions relative requirements research and extension resistance result rice root Rwanda season seed tubers selection soil South South Korea sprout storage stored supply Table temperate temperatures tons tropical usually varieties vegetable virus yields zones