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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
06/10/2008 |
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Data da última atualização: |
19/02/2009 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
NUTTI, M.; CARVALHO, J. L.; FUKUDA, W. |
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Afiliação: |
Marilia Nutti, CTAA; José Luiz Carvalho, CTAA; Wania Maria Gonçalves Fukuda, CNPMF. |
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Título: |
Institutionalizing the biofortification strategy in a sustainable way: the case of Brazil. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: SCIENTIFIC MEETING OF THE GLOBAL CASSAVA PARTNERSHIP, 1., 2008, Ghent. Cassava: meeting the challenges of the new millennium. Ghent:: IPBO, 2008. p. 26. |
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Idioma: |
Inglês |
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Notas: |
S1-2. |
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Conteúdo: |
With worldwide escalating food prices and a growing demand for biofuels, it is vital to increase the productivity of cassava in Africa. With average cassava yields of 7.0 and 11.3 t/ha in Uganda and Kenya respectively, yield levels in East Africa are low, While differences in agro-ecology explained part of the variation between sites, monocropping, weed management and hiring labour contributed to higher yields within sites. The importance of good management practices (improved varieties, monocropping, proper plant spacing, timely planting) was confirmed by the higher yield levels - 10.4 and 14.2 t/ha in Kenya and Uganda respectively - obtained in farmer managed control plots in 99 on-farm trials. Abiotic factors were more important yield determining factors than biotic factors, while weed management also explained an important part of yield variability. Fertilizer use (100-50-100 N-P205-K20) increased cassava yields by 5.8 t/ha, above ground biomass by 9.0 t/ha and the number of storage roots per plant by 2.7, but did not affect harvest index or root dry matter content. Although cassava production was limited by different nutrient(s) across sites, combined NPK fertilizer always resulted in the highest yields. Fetilizer response was related to soil fertility and early rainfall, but did not between varieties, across management levels or pest and disease pressures. On the short term, cassava productivity in East Africa can be improved by the widespread promotion of simple agronomic practices and improved varieties. On the longer term, fertilizer will be essential for the development of sustainable and profitable comercial cassava schemes. MenosWith worldwide escalating food prices and a growing demand for biofuels, it is vital to increase the productivity of cassava in Africa. With average cassava yields of 7.0 and 11.3 t/ha in Uganda and Kenya respectively, yield levels in East Africa are low, While differences in agro-ecology explained part of the variation between sites, monocropping, weed management and hiring labour contributed to higher yields within sites. The importance of good management practices (improved varieties, monocropping, proper plant spacing, timely planting) was confirmed by the higher yield levels - 10.4 and 14.2 t/ha in Kenya and Uganda respectively - obtained in farmer managed control plots in 99 on-farm trials. Abiotic factors were more important yield determining factors than biotic factors, while weed management also explained an important part of yield variability. Fertilizer use (100-50-100 N-P205-K20) increased cassava yields by 5.8 t/ha, above ground biomass by 9.0 t/ha and the number of storage roots per plant by 2.7, but did not affect harvest index or root dry matter content. Although cassava production was limited by different nutrient(s) across sites, combined NPK fertilizer always resulted in the highest yields. Fetilizer response was related to soil fertility and early rainfall, but did not between varieties, across management levels or pest and disease pressures. On the short term, cassava productivity in East Africa can be improved by the widespread promotion of simple agro... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02211naa a2200157 a 4500
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100 1 $aNUTTI, M.
245 $aInstitutionalizing the biofortification strategy in a sustainable way$bthe case of Brazil.
260 $c2008
500 $aS1-2.
520 $aWith worldwide escalating food prices and a growing demand for biofuels, it is vital to increase the productivity of cassava in Africa. With average cassava yields of 7.0 and 11.3 t/ha in Uganda and Kenya respectively, yield levels in East Africa are low, While differences in agro-ecology explained part of the variation between sites, monocropping, weed management and hiring labour contributed to higher yields within sites. The importance of good management practices (improved varieties, monocropping, proper plant spacing, timely planting) was confirmed by the higher yield levels - 10.4 and 14.2 t/ha in Kenya and Uganda respectively - obtained in farmer managed control plots in 99 on-farm trials. Abiotic factors were more important yield determining factors than biotic factors, while weed management also explained an important part of yield variability. Fertilizer use (100-50-100 N-P205-K20) increased cassava yields by 5.8 t/ha, above ground biomass by 9.0 t/ha and the number of storage roots per plant by 2.7, but did not affect harvest index or root dry matter content. Although cassava production was limited by different nutrient(s) across sites, combined NPK fertilizer always resulted in the highest yields. Fetilizer response was related to soil fertility and early rainfall, but did not between varieties, across management levels or pest and disease pressures. On the short term, cassava productivity in East Africa can be improved by the widespread promotion of simple agronomic practices and improved varieties. On the longer term, fertilizer will be essential for the development of sustainable and profitable comercial cassava schemes.
700 1 $aCARVALHO, J. L.
700 1 $aFUKUDA, W.
773 $tIn: SCIENTIFIC MEETING OF THE GLOBAL CASSAVA PARTNERSHIP, 1., 2008, Ghent. Cassava: meeting the challenges of the new millennium. Ghent:: IPBO, 2008. p. 26.
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