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Cassava has been changing its role from a traditional fresh human food to an efficient crop for animal feed and starch production. Nearly all cassava is grown by small farmers. Harvested roots are sold to animal feed or starch factories, or are used for on-farm feeding of pigs to be sold at the m...

Over the period 1994-1996, seven batches of seeds and two of meristem tissue cultures were evaluated and selected. As important as root yield is the trait starch content (or dry matter content) if a clone is to be accepted as a starch cultivar. At the time of reporting a number of clones have bee...

During the past 16 years the Chinese Academy of Tropical and Agricultural Sciences (CATAS) has made good progress in developing improved cassava varieties for China. Several improved varieties have been released in south China, of which cv. SC124, with high yield and good cold resistance, is alre...

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...

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...

Different physiological characteristics of the cassava plant, which can be used as selection parameters, are reviewed, namely LAI, HI, biomass production, plants with amphistomatic leaves, and C4 photosynthesis. Experience indicates that it is better to select var. showing lower yield reduction u...

Se revisan diferentes caracteristicas fisiologicas de la planta de yuca que se pueden utilizar como parametros de seleccion: IAF, IC, produccion de biomasa, plantas con hojas amfistomatosas y fotosintesis C4. Se enfatiza que se debe tratar de seleccionar var. que presenten menor disminucion en co...

The efficiency of different selection criteria (root wt., aerial part wt., total wt., no. of roots/plant, HI) applied to segregating populations of cassava crosses was assessed in expt. carried out at the Centro Nacional de Pesquisa de Mandioca e Fruticultura in Cruz das Almas (Bahia, Brazil). Sa...

Se evaluo la eficiencia de diferentes criterios de seleccion (peso de la raiz, peso de la parte aerea, peso total, no de raices/planta, IC) aplicados a poblaciones segregantes de cruzamientos de yuca en expt. realizados en el Centro Nacional de Pesquisa de Mandioca e Fruticultura en Cruz das Alma...

The importance of estimating genetic parameters in cassava in order to produce superior performing cv. is highlighted. Different concepts related to phenotypic variance are discussed; variance is divided into genetic (additive, dominance, epistasis) and environmental. Of the former, additive vari...

Se destaca la importancia de la estimacion de los parametros geneticos en la yuca para producir cv. superiores. Se discuten diferentes conceptos relacionados con la varianza fenotipica, la cual se divide en genetica (genetica aditiva, dominancia, epistasis) y ambiental; de las anteriores, la vari...