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Breeding cassava relies on a phenotypic recurrent selection that takes advantage of the vegetative propagation of this crop. Successive stages of selection (single row trial- SRT; preliminary yield trial – PYT; advanced yield trial – AYT; and uniform yield trials UYT), gradually reduce the number...
Several physical and biological factors that limit cassava productivity are described: temp. and photoperiod, soil water availability, RH, soil characteristics (fertility and pH), and pests and diseases. Six edapho--climatic zones (ECZ) for cassava production are defined on the basis of temp.: lo...
The importance of appropriate genetic variability for plant breeding work in cassava is highlighted; genetic erosion has been slight and therefore efforts should be made to collect and maintain germplasm of both cultivated and wild species. It is necessary to carry out physiological studies aimin...
Se enfatiza la importancia de una variabilidad genetica apropiada para trabajos de fitomejoramiento en yuca; se piensa que la erosion genetica ha sido poca y, por tanto, se deben hacer esfuerzos de recolectar y mantener germoplasma de tanto especies cultivadas como silvestres. Es necesario realiz...
Several important areas in which plant breeders must make decisions are outlined; the factors affecting decision-making in given situations are also analyzed. Three aspects that markedly influence the general structure of a cassava breeding program are discussed in detail, namely (1) definition o...
Se esbozan algunas de las principales areas en las que un fitomejorador debe tomar decisiones, y algunos de los factores que afectan tales decisiones en una situacion dada. Se trataran de manera especial 3 aspectos que tienen una influencia marcada en la estructura general de un programa de mejor...
Breeding cassava relies on several selection stages (single row trial-SRT; preliminary; advanced; and uniform yield trials—UYT). This study uses data from 14 years of evaluations. From more than 20,000 genotypes initially evaluated only 114 reached the last stage. The objective was to assess how ...
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