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The seventh testing cycle for promising CIAT selections under improved, low-input technology was completed in 1981 at 9 locations in Colombia. The overall av. yield of the trials was 8.5 t/ha/yr, which is nearly 3 times the national av. yield of 3-3.5 t/ha. Av. yield of local cv. was about twice ...

Advances in research of the soil and plant nutrition section of CIAT's Cassava Program in 1981 are given regarding symptoms of Ca and S deficiency, germplasm screening for adaptation to high acidity and/or low P; effect of fertilization (long-term fertility); level and time of K application; effe...

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 ...

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 tierra...

During 1981 the introduction of germplasm was continued with an additional 147 clones from Brazil in the form of aseptic meristem cultures. Cassava germplasm bank evaluation for adaptation, resistance to diseases and pests, yield, and root quality is in progress in the north coast of Colombia (Me...

Durante 1981 se continuo la introduccion de germoplasma, especialmente 147 clones de Brasil en la forma de cultivo de meristemos. Se siguio la evaluacion del banco de germoplasma de yuca por su adaptacion, resistencia a enfermedades y plagas rendimiento y calidad de las raices en la Costa Norte d...

Advances of the mycorrhiza project of CIAT's Cassava Program are highlighted. Objectives include the collection, maintenance, multiplication, and testing of mycorrhizal strains and determination of favorable cultural practices for maintaining mycorrhizal activity during the growth period of cassa...

The effect of storing cassava planting material on root productivity was assessed and the influence of the length of the storage period on the sprouting of cassava cuttings was determined in trials carried out in the municipalities of Betulia and Corozal (Sucre, Colombia). Cassava var. Regional V...

Se evaluo el efecto del almacenamiento del material de siembra en el rendimiento de raices de yuca y se determino la influencia de la duracion del almacenamiento en la brotacion de las estacas de yuca en ensayos realizados en los municipios de Betulia y Corozal (Sucre, Colombia). Se utilizo yuca ...

Se describe la estructura organizativa de la Oficina Nacional de Semillas de Costa Rica, la relacion entre organismos de la actividad semillera y el mecanismo para el control de calidad de semillas. (CIAT)

Important aspects involved in the establishment of a breeding program are indicated. The 1st step is to identify production constraints in order to define priorities. Solutions proposed should emphasize the improvement of materials or the adaptation and innovation of agronomic practices; this str...

Se indican algunos aspectos de importancia en el establecimiento de un programa de fitomejoramiento, donde el primer paso es identificar las limitaciones a la productividad en un orden que permita definir prioridades. Asi, se implementan las soluciones enfatizando el mejoramiento de materiales o ...