Resumo

JAMAICA, David  e  PLAZA, Guido. Evaluation of various conventional methods for sampling weeds in potato and spinach crops. Agron. colomb. [online]. 2014, vol.32, n.1, pp.36-43. ISSN 0120-9965.  https://doi.org/10.15446/agron.colomb.v32n1.39613.

This study aimed to evaluate (at an exploratory level), some of the different conventional sampling designs in a section of a potato crop and in a commercial crop of spinach. Weeds were sampled in a 16 x 48 m section of a potato crop with a set grid of 192 sections. The cover and density of the weeds were registered in squares of from 0.25 to 64 m². The results were used to create a database that allowed for the simulation of different sampling designs: variables and square size. A second sampling was carried out with these results in a spinach crop of 1.16 ha with a set grid of 6 x 6 m cells, evaluating the cover in 4 m² squares. Another database was created with this information, which was used to simulate other sampling designs such as distribution and quantity of sampling squares. According to the obtained results, a good method for approximating the quantity of squares for diverse samples is 10-12 squares (4 m²) for richness per ha and 18 or more squares for abundance per hectare. This square size is optimal since it allows for a sampling of more area without losing sight of low-profile species, with the cover variable best representing the abundance of the weeds.

Palavras-chave : vegetables; weed science; crop weed competition; cover; abundance; density.

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