Abstract
The aim of this study was to evaluate the effect of the weed competition with different spacings in the culture of flaxseed (Linum usitatissimum L.). The experiment was conducted at the Campus of Unioeste - Cascavel, Paraná State, using the split-plot design in which the plots consisted of presence and absence of weeds and subplots consisted of row spacings (0.15, 0.30, and 0.45 m) with six replications. Plant height, number of capsules, stems and seeds per plant and yield (kg.ha-1) were determined. The increase of spacings between rows and the coexistence with the weed community were detrimental to production components of flaxseed. Key words: Linunm usitatissimu L., competition, spatial arrangement of plants.
Highlights
Flaxseed (Linum usitatissimum L.) is a herbaceous plant that belongs to the Linaceae family, with more than 200 recognized species (Cui, 1998)
Spacing and spatial arrangement are the main factors related to the degree of interference between crops and weeds, as they act on the precocity and intensity of shading of the crop over weeds (Dias et al, 2009; Tharp and Kells, 2001; Norris et al, 2001; Knezevic et al, 2003)
The experimental setup used was the split plot scheme, in which the plots consisted of the presence and absence of weeds and subplots consisted of row spacings (0.15, 0.30, and 0.45 m) with six replications
Summary
Flaxseed (Linum usitatissimum L.) is a herbaceous plant that belongs to the Linaceae family, with more than 200 recognized species (Cui, 1998). The energy use of flax seeds can give a new direction to this culture, since its seed is rich in oil. The seeds contain about 38% oil, that once extracted can be used to produce biofuels (Rabetafika et al, 2011). Spacing and spatial arrangement are the main factors related to the degree of interference between crops and weeds, as they act on the precocity and intensity of shading of the crop over weeds (Dias et al, 2009; Tharp and Kells, 2001; Norris et al, 2001; Knezevic et al., 2003). Barreyro and Vallduvi (2002) determined the critical period of interference for the culture of flaxseed between Spacing and spatial arrangement are the main factors related to the degree of interference between crops and weeds, as they act on the precocity and intensity of shading of the crop over weeds (Dias et al, 2009; Tharp and Kells, 2001; Norris et al, 2001; Knezevic et al., 2003). Balbinot and Fleck (2005) emphasize that the competitiveness of crops is dependent on factors such as: cultivated species, morphological and physiological characteristics of the genotypes, weed species present in the area and time of their emergence, and environmental conditions, especially temperature, solar radiation and rainfall.
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