A compactação do solo determina, de certa maneira, as relações entre ar, água e temperatura, e estas influenciam praticamente em todas as fases do desenvolvimento vegetal. Nesse sentido, o objetivo do trabalho foi avaliar o efeito de diferentes profundidades de compactação, no desenvolvimento da cultura do milho. O delineamento experimental utilizado foi o de blocos inteiramente casualizados, com cinco tratamentos (0, 25, 50, 75 e 100% de compactação) e quatro repetições totalizando 20 unidades experimentais. Essas unidades experimentais foram representadas por vasos de polipropileno com 18 cm de altura e volume de 6,7 dm3. As características avaliadas foram: Altura de plantas, massa verde da parte aérea, massa seca da parte aérea, massa verde de raízes compactadas, massa seca de raízes compactadas, massa verde de raízes sem compactação, massa seca de raízes sem compactação. Os resultados evidenciaram que tanto o crescimento da parte aérea como o crescimento das raízes de milho são prejudicados pela compactação do solo.
The objective of the work was to evaluate the growth and development of the razor-blade grass (Paspalum virgatum L.). The experimental design was a randomized complete block design with 17 treatments, and the growth evaluations were performed at 20, 27, 34, 41, 48, 55, 62, 69, 76, 83, 90, 97, 104, 111, 118, 125, 132 days after sowing (DAS) and five replications, considering as sowing date the day the seeds were placed in the plastic boxes. The evaluated characteristics were: total dry mass (Mt), shoot dry mass (Ma) and dry mass of roots (Mr), number of leaves and number of tillers per plant. The quantitative variables related to plant growth were analyzed by applying the F test on the analysis of variance followed by non-linear log-logistic regressions, with the objective of modeling the data in the form of equations. The razor-blade grass (Paspalum virgatum L.) is a weed with slow initial development and growth, but with high dry mass production at the end of the cycle.
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