Abstract
In pineapple fields, weed competition is exacerbated by the fact that the crop is small and has a very slow vegetative development. The objective of this study was to determine the effects of herbicides on growth, yield and quality of pineapple, cultivar 'Pérola'. The experimental design was in randomized blocks with four treatments and four replications. Treatments consisted of weeding by hoe and the herbicides diuron; fluazifop-p-butyl and atrazine + S-metolachlor applied in post-emergence. The characteristics evaluated monthly during the vegetative stage were stem diameter, D-leaf length, number of leaves, number of emitted leaves and percentage of natural floral induction. In the reproductive phase, evaluations were made of average fruit weight (g) with and without crown, fruits length and diameter, number of slip, slip-sucker and sucker type seedlings, determination of soluble solids and pH in the pulp. There was no effect of herbicide treatment on the vegetative growth characteristics. Stem diameter increased until 330 days after planting, showing a decrease after this period. The D-leaf grew over time in all treatments, although phytotoxicity symptoms were observed after the first application of herbicides. The traits evaluated on the reproductive phase showed no significant differences in response to treatments. Therefore, the use of diuron fluazifop-p-butyl and atrazine + S-metolachlor did not affect growth, yield and fruit quality of pineapple, cultivar 'Pérola'.
Highlights
Pineapple (Ananas comosus var. comosus (L.) Merril) belongs to the bromeliaceae, monocotiledonae family, originated from warm climates in the Americas, being the main producers: Thailand, Brazil, Philippines, india and China
In pineapple fields, weed competition is exacerbated by the fact that the crop is small and grows very slowly, favoring the extraction of water and nutrients by weeds. (CATUNDA et al, 2005)
Results obtained were presented in two phases, being one the vegetative and the other the reproductive
Summary
Pineapple (Ananas comosus var. comosus (L.) Merril) belongs to the bromeliaceae, monocotiledonae family, originated from warm climates in the Americas, being the main producers: Thailand, Brazil, Philippines, india and China. Comosus (L.) Merril) belongs to the bromeliaceae, monocotiledonae family, originated from warm climates in the Americas, being the main producers: Thailand, Brazil, Philippines, india and China. Brazil is the second main pineapple producer, being Thailand the main producer (FAo, 2010). According to Reinhardt (2002), pineapple shows slow growth and superficial root system, factors that expose it to intense competition with weeds, and contribute to delay crop development and reduce their yield and quality. It is recommended to keep the fields clean from weeds during the first five to six months after planting. In pineapple fields, weed competition is exacerbated by the fact that the crop is small and grows very slowly, favoring the extraction of water and nutrients by weeds. Ten to twelve weedings may be needed, burdening the production cost considerably
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