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Morphological traits in oat plants cultivars as indicators of competitive potential against weeds/Caracteristicas morfologicas em plantas de cultivares de aveia como indicadoras do potencial competitivo com plantas daninhas
The aim of this study was to compare plant oat morphological traits of cultivars at early stages, that may be more competitive against weeds. A field experiment was performed at Universidade Federal do Rio Grande do Sul, in Eldorado do Sul--RS, during 2005 cold season, in a completely random design,...
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Published in: | Ciência rural 2009-08, Vol.39 (5), p.1313 |
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Main Authors: | , , , , |
Format: | Article |
Language: | Spanish |
Online Access: | Get full text |
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Summary: | The aim of this study was to compare plant oat morphological traits of cultivars at early stages, that may be more competitive against weeds. A field experiment was performed at Universidade Federal do Rio Grande do Sul, in Eldorado do Sul--RS, during 2005 cold season, in a completely random design, with four replicates. The oat cultivars evaluated were: 'ALBASUL', 'CFT 1', 'FAPA 5', 'FAPA 6', 'UFRGS 19', 'UPF 16', 'UPFA 20', 'UPFA 22', 'URS 21', and 'URS 22'. Plant traits evaluated were: plant height, shoot dry matter, soil canopy coverage, increases in height, dry matter and coverage, competitive potential, biological yield, grain yield, and harvest index. Oat cultivars show outstanding variations regarding to morphological traits during the initial growth period. 'UPF 16' and 'UPFA 22' cultivars present typical characteristics of competing plants, due to high soil coverage by their canopies and to fast increments in height and in soil coverage, during the initial growth period. 'ALBASUL' cultivar, on the other hand, does not hold a competitor profile with weeds at the beginning of development, although it presents high grain yield and high harvest index. Key words: Avena sativa, interference, competition, genotypes, cultural management. O objetivo do experimento foi comparar cultivares de aveia quanto a caracteristicas morfologicas de plantas no inicio do desenvolvimento que possam mostrar relacao com a capacidade de competir com plantas daninhas. Para tanto, foi realizado um experimento a campo na Universidade Federal do Rio Grande do Sul, em Eldorado do Sul, Rio Grande do Sul (RS), durante a estacao fria de 2005. O delineamento experimental utilizado foi o de blocos completamente casualizados, com quatro repeticoes. Foram investigadas 10 cultivares de aveia, a saber: 'ALBASUL', 'CFT 1', 'FAPA 5', 'FAPA 6', 'UFRGS 19', 'UPF 16', 'UPFA 20', 'UPFA 22', 'URS 21' e 'URS 22'. As caracteristicas de planta avaliadas foram: estatura de planta, materia seca da parte aerea, cobertura foliar do solo, incrementos em estatura, materia seca e cobertura, potencial competitivo, produtividade biologica, produtividade de graos e indice de colheita. Constatou-se que cultivares de aveia mostram variacoes acentuadas em caracteristicas morfologicas no inicio do ciclo. As cultivares 'UPF 16' e 'UPFA 22' apresentam caracteristicas tipicas de plantas competidoras devido a elevada cobertura proporcionada por seus dosseis e aos rapidos incrementos em estatura e cobertura do solo |
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ISSN: | 0103-8478 |