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In Bolivia cassava is grown in 4 large areas, Beni-Pando, Yungas, Santa Cruz, and Chapare, where soils are mostly Inceptisols with some Entisols in the lowlands; Ultisols and Inceptisols predominate in the Yungas area. Currently 47,000 ha are planted to cassava in the country, with av. yields of ...

En Bolivia la yuca se cultiva en 4 grandes zonas, Beni-Pando, Yungas, Santa Cruz y Chapare, con suelos en su mayoria Inseptisoles con algunos Entisoles en las zonas bajas; en Yungas dominan los Ultisoles e Inseptisoles. Actualmente se siembran 47,000 ha en todo el pais, con un prom. de rendimient...

The factors affecting the quality of cassava roots were studied: var. and age of the plant; DM, starch, and sugar contents in the roots; cyanide contents in leaves and roots. Roots of bitter var. CMC-84 showed higher DM contents than those of sweet var. CMC- 40. Total and reducing sugar contents ...

Se estudiaron los factores que afectan la calidad de las raices como: var.; edad de la planta; contenidos de MS, almidon y azucares en la raiz; y contenidos de cianuro en hojas y raices. Las raices de la var. amarga CMC-84 presentaron mayor contenido de MS que la var. dulce CMC-40. Los contenidos...

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...

Results of research carried out at El Carmen Regional Research Center during 1987A/1988A are presented. The process of var. selection is carried out in 3 phases: F1C1, the 1st F1 clonal generation; preliminary yield trials; and yield trials. The selection criteria applied in each trial are detail...

Se presentan los resultados de investigacion realizada en el Centro Regional de Investigacion El Carmen durante 1987A-1988A. El proceso de seleccion var. se realiza en 3 fases consecutivas: F1C1 la primera generacion clonal de F1, ensayos preliminares de rendimiento y ensayos de rendimiento. Se d...

The physiological processes that determine bean growth are reviewed, namely photosynthesis, respiration, DM distribution, HI, yield components, and environmental effects. Some concepts used in physiological work such as growth analysis, leaf area determination, data analysis, yield, yield compone...

Se revisan los procesos fisiologicos que determinan el crecimiento del frijol: fotosintesis, respiracion, distribucion de MS, IC, componentes del rendimiento y efectos ambientales. Tambien se discuten algunos conceptos utilizados en trabajos fisiologicos tales como analisis del crecimiento, deter...

Main activities carried out regarding plant breeding in Latin America, Africa, and Asia are summarized. In the case of Latin America, activities involved germplasm management, gene pool development, a project for developing semiarid and subtropical germplasm, participatory research for var. selec...

Se resumen las principales actividades relacionadas con el mejoramiento de la yuca en America Latina, Africa y Asia. En el caso de America Latina, las actividades incluyeron el manejo del germoplasma, el desarrollo de bancos de genes, un proyecto para desarrollar germplasma para regiones semiarid...