Levantamento das espécies de macrófitas aquáticas ocorrentes em orizicultura em uma área do município de São Gabriel, Rio Grande do Sul, Brasil

Abstract

Rice (Oryza sativaL.) is a hydrophilic species, whose evolutionary process has led to its adaptation to various environmental conditions. There are two ecosystems for culture, which are the lowland, lowland and upland control, including without irrigation and supplementary irrigation sprinkler. Invasive plants through competition for water, light and nutrients and indirect actions as a host of diseases and pests, and allelopathic interactions can cause significant losses in productivity of rice. Your management aims tore duce these losses, provide better harvesting conditions and prevent the spread of infestations in cultivated areas. The objective of this study was to perform a botanical survey of invasive plant species present in the culture of rice. For this, the work was done on a farm in São Gabriel (30 ° 23 '08.77 "S and 54 ° 20' 37.23" W), Rio Grande do Sul, Brazil, and the collection was completed in April 2010. We found ten weed species distributed in eight botanical families, with a predominance species of Sagittaria montevidensis Cham. & Schltdl, como espécie aquática e Ludwigia leptorcapa e Aeschynomene denticulata Rudd. and semi-aquatic species.