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 54
Trang 9
... disease attack . If one plant was susceptible to a disease , most others were likely to be susceptible too . In the 1840s an outbreak of late blight ravaged potatoes . This fungal disease destroys stems and foliage . The ensuing ...
... disease attack . If one plant was susceptible to a disease , most others were likely to be susceptible too . In the 1840s an outbreak of late blight ravaged potatoes . This fungal disease destroys stems and foliage . The ensuing ...
Trang 28
... disease infection . The potato plant has shallow roots - they seldom extend deeper than 40 to 50 centimeters ( Fig . 4 ) . If , however , no obstructive layers or sharp transitions from one soil type to another occur in the soil profile ...
... disease infection . The potato plant has shallow roots - they seldom extend deeper than 40 to 50 centimeters ( Fig . 4 ) . If , however , no obstructive layers or sharp transitions from one soil type to another occur in the soil profile ...
Trang 34
... diseases transmitted by seed tubers are 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 ...
... diseases transmitted by seed tubers are 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 ...
Trang 36
... diseases . Weather and climate Daylength and temperature . Potatoes are grown as an economic crop under a wide range of daylength regimes - from 12 hours of sunlight in the Andes and equatorial zones of Africa and Asia , to over 16 ...
... diseases . Weather and climate Daylength and temperature . Potatoes are grown as an economic crop under a wide range of daylength regimes - from 12 hours of sunlight in the Andes and equatorial zones of Africa and Asia , to over 16 ...
Trang 40
... diseases The potato crop is susceptible to over 300 pests and diseases , but it is neither practical nor necessary to control them all because most have a negligible effect on production . Indiscrim- inate " blanket " control can do ...
... diseases The potato crop is susceptible to over 300 pests and diseases , but it is neither practical nor necessary to control them all because most have a negligible effect on production . Indiscrim- inate " blanket " control can do ...
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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