Phytosociology of spontaneous plants in organic carrot cultivation

Abstract

Spontaneous plants cause problems in vegetable crops, and it is important to identify the species to carry out the management. The objective of this work was to evaluate the community of spontaneous plants present in organic carrot cultivation in the North region of Brazil. The research was carried out at the Seridó Ecological Site, Rio Branco, Acre. It consisted of the phytosociological evaluation of the weed community in organic carrot cultivation. The experiment was set up in a randomized block design, in split plots (5 x 2). The plot consisted of five periods of weed control: 15, 20, 25, 30 and 35 days; and the subplots, sowing methods: direct sowing and hydroconditioned seed. The carrot crop remained free of weeds, according to each treatment, and subsequently grew without cleaning until harvest. The evaluation was carried out at harvest with the carrot, through sampling with a wooden square. After obtaining the data, the variables were calculated. The most important spontaneous plants in carrot cultivation are Eleusine indica, Alternanthera tenella and Digitaria horizontalis. The diversity of species present in organic carrot cultivation requires greater planning for decision-making in management.