Resumen

BLANCO, Yaisys  y  LEYVA, Á. Abundance and diversity of weeds in maize (Zea mays L.) preceded by a transient after fallow potato (Solanum tuberosum L.). cultrop [online]. 2010, vol.31, n.2, pp.00-00. ISSN 0258-5936.

Weeds constitute a sort of plant species damaging its yields sensibly when coexisting in competition with economic crops; however, regarding the theoretical conception of sustainable agriculture, weeds are a key element to be considered and its management is aimed to improve or solve some problems caused by erosion, cover and preservation of soil fertility. Also, weed species diversity/m2 enables to increase the overall stability of agrarian systems in front of plenty weed-tolerating levels, so that beneficial insects would increase. The present work was conducted at the National Institute of Agricultural Sciences, with the objective of determining the dominant and subordinate weed species, its abundance and specific diversity competing with maize crop preceded by a transitory fallow after potato crop. A randomized block design was used with four repetitions and three treatments of weed management: (1) non-handling weed tillage during the whole crop cycle, (2) non-handling tillage until the beginning of the critical competition period and (3) non-handling tillage after the critical competition period. Results showed that Cyperus rotundus and Rottboellia exaltata were the dominant species of the system, probably due to the preceding crops, dominated by selective herbicides of high residual power. Floral composition was made up by 15 species derived from eight botanical families: 46.67 % belonging to Poaceae, 13.33 % to Euphorbiaceae, and 6.66 % only represented the families Amaranthaceae, Asteraceae, Cyperaceae, Cucurbitacea, Portulacaceae and Zigofilacea

Palabras clave : weeds; dominant species; biological competition; maize; crop management.

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