Mejoramiento varietal
During 1981 genotype evaluation and selection continued at the ICA (Instituto Colombiano Agropecuario)-Caribia and the ICA-CIAT- Carimagua stations and at CIAT-Palmira, considered representative sites, resp., of (1) low-input technology with medium to high fertility soils in hot, lowland tropics (ed...
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| Format: | Book Chapter |
| Language: | Español |
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International Center for Tropical Agriculture
1981
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| Online Access: | https://hdl.handle.net/10568/81632 |
| _version_ | 1855516883120291840 |
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| author | International Center for Tropical Agriculture |
| author_browse | International Center for Tropical Agriculture |
| author_facet | International Center for Tropical Agriculture |
| author_sort | International Center for Tropical Agriculture |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | During 1981 genotype evaluation and selection continued at the ICA (Instituto Colombiano Agropecuario)-Caribia and the ICA-CIAT- Carimagua stations and at CIAT-Palmira, considered representative sites, resp., of (1) low-input technology with medium to high fertility soils in hot, lowland tropics (edaphoclimatic zone I), (2) low- to medium-input technology with extremely low fertility soils in the tropical savannas (edaphoclimatic zone II); and (3) low-input technology with high fertility soils in the medium alt. tropics (edaphoclimatic zone IV). In zone IV, there has been a steady upward trend in root yield as of 1973, with current av. yields of 40 t/ha and max. yields of 60 t/ha with more than 35 percent DM. In zone I, av. yields of 40 t/ha with more than 30 percent DM are also obtained. In zone II, F1 clones have already outyielded local cv., mainly due to improved resistance to CBB and superelongation disease (Sphaceloma manihoticola). Advances in yield stability were analyzed on the basis of spatial stability (macro and microspatial), system stability (over fertility levels and over farm management), and temporal stability (especiallyregarding the nature of resistance to CBB and the superelongation disease, quality of planting stakes, deterioration of cv., and unforeseen factors). Aspects related to economically valid yields are analyzed: root DM content and eating quality, root perishability, HCN content, and ease of harvest. CIAT's capacity for production and distribution of hybrid seeds has increased; 30,000 seeds are used each year in the selection process and approx. another 20,000 seeds are sent to collaborating national programs. (CIAT) |
| format | Book Chapter |
| id | CGSpace81632 |
| institution | CGIAR Consortium |
| language | Español |
| publishDate | 1981 |
| publishDateRange | 1981 |
| publishDateSort | 1981 |
| publisher | International Center for Tropical Agriculture |
| publisherStr | International Center for Tropical Agriculture |
| record_format | dspace |
| spelling | CGSpace816322025-11-05T16:54:54Z Mejoramiento varietal International Center for Tropical Agriculture manihot esculenta bacterial diseases composition cultivars cuttings deterioration development diseases and pathogens dry matter mycoses pests productivity propagation materials resistance root productivity roots soybean flour sphaceloma manihoticola symptomatology flours xanthomonas campestris manihotis plant anatomy composicion variedades estacas deterioracion enfermedades y patogenos materia seca micosis plagas fitomejoramiento productividad materiales de propagación resistencia productividad de raíces raíces harina de soya sintomatología During 1981 genotype evaluation and selection continued at the ICA (Instituto Colombiano Agropecuario)-Caribia and the ICA-CIAT- Carimagua stations and at CIAT-Palmira, considered representative sites, resp., of (1) low-input technology with medium to high fertility soils in hot, lowland tropics (edaphoclimatic zone I), (2) low- to medium-input technology with extremely low fertility soils in the tropical savannas (edaphoclimatic zone II); and (3) low-input technology with high fertility soils in the medium alt. tropics (edaphoclimatic zone IV). In zone IV, there has been a steady upward trend in root yield as of 1973, with current av. yields of 40 t/ha and max. yields of 60 t/ha with more than 35 percent DM. In zone I, av. yields of 40 t/ha with more than 30 percent DM are also obtained. In zone II, F1 clones have already outyielded local cv., mainly due to improved resistance to CBB and superelongation disease (Sphaceloma manihoticola). Advances in yield stability were analyzed on the basis of spatial stability (macro and microspatial), system stability (over fertility levels and over farm management), and temporal stability (especiallyregarding the nature of resistance to CBB and the superelongation disease, quality of planting stakes, deterioration of cv., and unforeseen factors). Aspects related to economically valid yields are analyzed: root DM content and eating quality, root perishability, HCN content, and ease of harvest. CIAT's capacity for production and distribution of hybrid seeds has increased; 30,000 seeds are used each year in the selection process and approx. another 20,000 seeds are sent to collaborating national programs. (CIAT) Durante 1981 se continuo la evaluacion y seleccion de genotipos en ICA (Instituto Colombiano Agropecuario)-Caribia, ICA-CIAT- Carimagua y CIAT--Palmira que son sitios representativos, resp., de tecnologias de 1) bajos insumos en suelos de fertilidad intermedia- alta en el tropico calido de tierras bajas (zona edafoclimatica I), 2) baja-intermedia en insumos con suelos de muy baja fertilidad en sabanas tropicales (zona edafoclimatica II) y 3) bajos insumos en suelos de alta fertilidad en tropicos de alt. intermedia (zona edafoclimatica IV). En la zona IV los rendimientos han presentado una tendencia ascendente desde 1973, con prom. actuales de 40 t/ha y max. de 60 t/ha con mas de 35 por ciento de MS. En la zona I tambien se obtienen prom. de 40 t/ha con mas de 30 por ciento de MS. En la zona II, los rendimientos de los clones F1 ya han superado los de los cv. locales, principalmente por el mejoramiento de la resistencia al CBB y superalargamiento (Sphaceloma manihoticola). Se analizan los avances en la estabilidad del rendimiento con base en la estabilidad espacial (macro y microespacial), estabilidad de sistemas (en niveles de fertilidad y en rangos de manejo de las fincas) y estabilidad en el tiempo (especialmente con respecto a la naturaleza de la resistencia al CBB y superalargamiento, calidad de las estacas, deterioro de cv. y factores imprevistos). Se analizan aspectos relacionados con un rendimiento economicamente valido, incluyendo el contenido de MS en las raices y calidad culinaria, la deteriorabilidad de las raices, el contenido de HCN y la facilidad de cosecha. La capacidad del CIAT para la produccion y distribucion de semillas hibridas ha aumentado; en el proceso de seleccion se utilizan 30,000 semillas/ano y se envian aprox. otras 20,000 a programas nacionales colaboradores. (CIAT) 1981 2017-06-20T08:51:07Z 2017-06-20T08:51:07Z Book Chapter https://hdl.handle.net/10568/81632 es Open Access application/pdf International Center for Tropical Agriculture Mejoramiento varietal.1981. In: Centro Internacional de Agricultura Tropical. Programa de Yuca: Informe Anual 1981 . CIAT, Cali, CO. p. 147-172. |
| spellingShingle | manihot esculenta bacterial diseases composition cultivars cuttings deterioration development diseases and pathogens dry matter mycoses pests productivity propagation materials resistance root productivity roots soybean flour sphaceloma manihoticola symptomatology flours xanthomonas campestris manihotis plant anatomy composicion variedades estacas deterioracion enfermedades y patogenos materia seca micosis plagas fitomejoramiento productividad materiales de propagación resistencia productividad de raíces raíces harina de soya sintomatología International Center for Tropical Agriculture Mejoramiento varietal |
| title | Mejoramiento varietal |
| title_full | Mejoramiento varietal |
| title_fullStr | Mejoramiento varietal |
| title_full_unstemmed | Mejoramiento varietal |
| title_short | Mejoramiento varietal |
| title_sort | mejoramiento varietal |
| topic | manihot esculenta bacterial diseases composition cultivars cuttings deterioration development diseases and pathogens dry matter mycoses pests productivity propagation materials resistance root productivity roots soybean flour sphaceloma manihoticola symptomatology flours xanthomonas campestris manihotis plant anatomy composicion variedades estacas deterioracion enfermedades y patogenos materia seca micosis plagas fitomejoramiento productividad materiales de propagación resistencia productividad de raíces raíces harina de soya sintomatología |
| url | https://hdl.handle.net/10568/81632 |
| work_keys_str_mv | AT internationalcenterfortropicalagriculture mejoramientovarietal |