DEVELOPMENT UNIFORMITY AND RESPONSE OF MAIZE CULTIVARS TO THE INCREMENT IN PLANT DENSITY
Maize cultivars with contrasting response to the increment in plantdensity may present different patterns of plant development. This work was carried out aiming to evaluate if morphological and phenological uniformities are important traits to enhance maize tolerance to crowding. The experiment was...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Associação Brasileira de Milho e Sorgo
2009-04-01
|
| Series: | Revista Brasileira de Milho e Sorgo |
| Subjects: | |
| Online Access: | http://rbms.cnpms.embrapa.br/index.php/ojs/article/view/271/280 |
| Summary: | Maize cultivars with contrasting response to the increment in plantdensity may present different patterns of plant development. This work was carried out aiming to evaluate if morphological and phenological uniformities are important traits to enhance maize tolerance to crowding. The experiment was set up in Lages, Santa Catarina, southern Brazil, during the 2005/2006 and 2006/2007 growing seasons. Three cultivars were evaluated: an open-pollinated variety (OPV), a double-cross hybrid (DH) and a single-cross hybrid (SH). Each cultivar was tested at five plant densities: 25000, 50000, 75000, 100000 and 125000 pl.ha-1. The variation coefficients of plant leaf area and phenologycal development were assessed at eight growth stages. Grain yield was also determined. The SH presented lower variation coefficient than the other cultivars for plant leaf area and phenological growth stage before flowering and during silking. The increment in plant population from 25000 to 125000 pl.ha-1 increased the variation coefficient of leaf area and phenological growth stage at silking. The SH grain yield was higher and more responsive to plant density increment. The lowest morphological and phenologycal variability among plants contributed to enhance SH tolerance to crowding. |
|---|---|
| ISSN: | 1676-689X 1980-6477 |