Competitive Interaction between Weeds and Onion Crop

Abstract

Among the factors that affect crop productivity are weeds that compete for the resources present in the environment. Then, the objective of this study was to evaluate the competitiveness of turnip and ryegrass infesting the onion crop. The experiment was conducted in a greenhouse, in a randomized complete block design, arranged in a 2x8 factorial scheme, with four replications. In factor A, were allocated the weeds (turnip and ryegrass) and in the B, were allocated populations of these species (0, 1, 2, 3, 4, 5, 6 and 7 pot-1 plants) living with an onion plant. 50 days after transplanting, were evaluated the height, stem diameter, leaf area and dry mass of the aerial part of the onion plants. For the weeds, only the dry mass of the aer ial part was determined. In face of the results, it can be observed that the onion has a low competitive capacity, being the turnip the weed more aggressive in the competition, for all evaluated variables.

Are pyroxasulfone and pyroxasulfone plus flumioxazin options for application in transplanted onions?

“…As for wild radish, it is a species that presents rapid growth and high competitive capacity (Franceschetti et al, 2019), especially in crops with slow initial growth and leaf architecture that does not favor soil coverage, such as onions. Furthermore, the low temperatures during the onion cultivation period in Curitibanos allow for the emergence of new wild radish, as it is a winter annual plant.…”

“…Furthermore, the low temperatures during the onion cultivation period in Curitibanos allow for the emergence of new wild radish, as it is a winter annual plant. These various plant emergence flows and high population density can lead to a decrease in height, stem diameter, leaf area, bulb diameter, and dry mass of onions (Franceschetti et al, 2019).…”