Mejoramiento de la yuca para adaptacion en condiciones de estres : desarrollo de una metodologia

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.: lowland tropics, ECZ 1 (low to moderate rainfall and long dry season; high annual temp.), ECZ 2 (moderate to high rainfall on acid, infertile soils), and ECZ 3 (no marked dry season, high rainfall, high constant rh); intermediate alt. tropics, ECZ 4; highland tropics, ECZ 5; and subtropics, ECZ 6. A unique combination of potential pest and disease problems can be identified for each ECZ. In Colombia, conditions for 5 of the 6 ECZ (ECZ 1-5) have been identified. CIAT`s improvement strategy consists of: (1) germplasm collection in different Colombian ECZs; (2) selection of parents and formation of gene-pools for each ECZ; (3) evaluation and selection of hybrids within and between the zones; and (4) recommendations to national programs on the testing of selected clones and/or specific progenies. Results obtained using this methodology prove the highpotential existing for improving cassava productivity under stress conditions through var. improvement methods and simple cultural practices. (CIAT)

Bibliographic Details

Main Author:	Hershey, Clair H.
Format:	Report biblioteca
Language:	Spanish / Castilian
Published:	International Center for Tropical Agriculture 1982
Subjects:	manihot esculenta, adaptation, bacterial diseases, climatic requirements, cultivation, diseases and pathogens, germplasm, hybridizing, injurious insects, injurious mites, mycoses, pests, plant breeding, selection, soil requirements, soybean flour, viroses, flours, noxious animals, adaptación, requerimientos climaticos, cultivo, enfermedades y patogenos, germoplasma, hibridacion, insectos perjudiciales, acaros perjudiciales, micosis, plagas, fitomejoramiento, selección, requerimientos del suelo, harina,
Online Access:	https://hdl.handle.net/10568/71804
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