Relaciones de competencia entre frijol y maiz en sistemas de asociacion y sus inferencias para el mejoramiento genetico
The process of selection in climbing bean improvement should be conducted with maize in association due to the high cost of sole cropping with stakes or with a trellis system. The relation between yields of beans and maize is negative and the regression coefficient is normally between -1 and -2. In other words, for each additional kg of beans, between 1-2 kg of maize is lost due to the competition. The line of regression may be used to forecast yields of maize in monoculture and the reduction of maize yields serves as an index of the competitive ability of beans. Therefore it is not necessary to plant the resp. monocultures. The most competitive bean genotypes have higher yields in association with maize. However, in monoculture the var. of less competitive ability tend to be more productive. More competitive var. are taller and of later maturity and are of growth habit IVB. The most competitive maize var. are also tall. Early-maturing and shorter var. show interesting possibilities for association, but they have to be selected for resistance to stem lodging. Economic analysis shows that the most competitive bean var. (habit IVB) produce the highest income. Habit IVB attributes a high capacity to survive regardless the competence by maize, weeds, diseases, and pests. To study the change in the type of plant to an earlier-maturing plant (habit IVA) that, together with an earlier-maturing maize, allows the relay or rotational system to be extended to other crops, improved cultural practices and resistance to major diseases and pests should be included. These are the objectives of the program and the results obtained up to date, indicate that beans can be selected for a reduced competitive ability and higher productivity in association with maize in early generations. (AS-CIAT)
| Main Author: | |
|---|---|
| Format: | Report biblioteca |
| Language: | Spanish / Castilian |
| Published: |
International Center for Tropical Agriculture
1981
|
| Subjects: | phaseolus vulgaris, zea mays, cultivation systems, intercropping, agronomic characters, selection, cultivars, yields, income, sistemas de cultivo, cultivos asociados, características agronómicas, selección, variedades, rendimiento, ingresos, |
| Online Access: | https://hdl.handle.net/10568/71357 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|