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The effects of competition of seven weed species on the growth of coffee plants were evaluated under greenhouse conditions. Thirty days after coffee seedling transplantation into 12 L pots with soil level area of 6.5 dm², weeds were transplanted into or sown in those pots, at densities of 0, 1, 2, 3, 4 and 5 plants per pot. Competition or weedy periods from weed transplantation or emergence to plant harvesting, at weed pre-flowering stage, were: 77 days - Bidens pilosa, 98 days - Brachiaria decumbens, 180 days - Commelina diffusa, 82 days - Leonurus sibiricus, 68 days - Nicandra physaloides, 148 days - Richardia brasiliensis and 133 days - Sida rhombifolia. Coffee plant height, stem diameter, leaf number and shoot dry matter were determined. Effects of competition by N. physaloides and S. rhombifolia against coffee plants were among the lowest, since only a slight decrease in all the characteristics evaluated in coffee plants was observed. The other weed species caused severe decrease in growth, mainly with increasing weed plant densities. Competition degree was found to depend on weed species and density. Este trabalho teve como objetivo avaliar os efeitos da competição de sete espécies de plantas daninhas sobre o crescimento de plantas de café, cultivadas em casa de vegetação. Aos 30 dias após o transplantio das mudas de café, em vasos contendo 12 L de substrato e com área de 6,5 dm² na superfície do solo, fez-se o transplantio e/ou a semeadura das espécies daninhas nesses vasos, em seis densidades (0, 1, 2, 3, 4 e 5 plantas por vaso). Os períodos de convivência, desde o transplantio ou emergência das plantas daninhas até a colheita das plantas, quando do florescimento das plantas daninhas, foram de 77 dias - Bidens pilosa, 180 dias - Commelina diffusa, 82 dias - Leonurus sibiricus, 68 dias - Nicandra physaloides, 148 dias - Richardia brasiliensis e 133 dias - Sida rhombifolia. Foram avaliados a altura de plantas, o diâmetro do caule, o número de folhas e a massa seca da parte aérea das plantas de café. Os efeitos da competição de N. physaloides e S. rhombifolia sobre as plantas de café foram os menores comparados aos causados pelas demais espécies de plantas daninhas, uma vez que apenas leves decréscimos - em todas as características avaliadas - no cafeeiro foram observados. As demais espécies de plantas daninhas causaram severa redução no crescimento do cafeeiro, principalmente com o incremento da densidade delas. O grau de interferência variou com a espécie e com a densidade das plantas daninhas

Effects of weed species competition on the growth of young coffee plants