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 36
Trang 34
... virus diseases . Preventing virus spread is the chief objective of seed potato certification . Viruses depress potato yields by reducing the amount of green foliage and photosynthesis . The magnitude of yield losses from virus diseases ...
... virus diseases . Preventing virus spread is the chief objective of seed potato certification . Viruses depress potato yields by reducing the amount of green foliage and photosynthesis . The magnitude of yield losses from virus diseases ...
Trang 41
... Virus diseases . Viruses are found in all potato - producing regions . Once infected , potato plants cannot be cured . Conse- quently , methods for controlling viruses center on the use of virus - resistant varieties and detection and ...
... Virus diseases . Viruses are found in all potato - producing regions . Once infected , potato plants cannot be cured . Conse- quently , methods for controlling viruses center on the use of virus - resistant varieties and detection and ...
Trang 43
... viruses , which cut yields of future potato crops because viruses are transmitted through seed tubers . Nematodes , microscopic wormlike organisms that bore into tubers , cause both primary and secondary damage . They decrease yields ...
... viruses , which cut yields of future potato crops because viruses are transmitted through seed tubers . Nematodes , microscopic wormlike organisms that bore into tubers , cause both primary and secondary damage . They decrease yields ...
Trang 45
... virus resistance - to be added to an existing variety , while maintaining the other traits such as agronomic adaptation and culinary quality . " Population breeding , " based on large - scale crossing and re- current selection with ...
... virus resistance - to be added to an existing variety , while maintaining the other traits such as agronomic adaptation and culinary quality . " Population breeding , " based on large - scale crossing and re- current selection with ...
Trang 49
... virus diseases or that is not in the right stage can depress yields substantially . The scarcity of reasonably priced , healthy seed tubers at planting time is the main factor inhibiting potato production in many developing areas ...
... virus diseases or that is not in the right stage can depress yields substantially . The scarcity of reasonably priced , healthy seed tubers at planting time is the main factor inhibiting potato production in many developing areas ...
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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 |
Thuật ngữ và cụm từ thông dụng
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