Dynamics and period of weed control in lettuce grown in an organic system
DOI:
https://doi.org/10.1590/1983-21252025v3812665rcKeywords:
Lactuca sativa L. Competition. Protected environment.Abstract
Growing lettuce in a shaded environment in the semi-arid region has become an alternative to creating an ideal microclimate for crop development. However, this microclimate also favors weed development. Therefore, the objective of this study was to evaluate the effect of the reduction in luminosity caused using shading screens on the critical period of interference prevention (CPIP) in organic lettuce cultivation. Two experiments were carried out in randomized blocks with three replications in a split-plot design. The first experiment was conducted under full light conditions and the second in a shaded environment with a 35% reduction in light intensity. Shading altered the dynamics of weeds, with Digitaria horizontalis Willd and Amaranthus spinosus L. having the highest density in crops without cover and shaded environments, respectively. The lack of weed control reduced lettuce productivity by 66 and 90% in uncovered and shaded systems, respectively. The CPIP of lettuce in an uncovered environment occurred 11–33 and 12–28 days after transplant (DAT) considering an acceptable production reduction of 2.5 and 5%, respectively. The shaded environment decreased the CPIP of lettuce to 8–19 and 9–18 DAT for acceptable production reductions of 2.5 and 5%, respectively. Therefore, growing organic lettuce in a shaded environment allows for a shorter control period.
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