Germinação de Sementes e Emergência de Plântulas de Faveira (Clitoria fairchildiana R. A. Howard. - FABACEAE)

Abstract

Clitoria fairchildiana R.A. Howard is a species from the Amazon region with a good potential for the afforestation and restoration of degraded areas. But, information concerning germination and seedling emergence of C. fairchildiana seeds are scarce. The objective of this work was thus to determine the cardinal temperatures and the most adequate substratum for the evaluation of those seeds as well as to evaluate the effects of sowing depth on seedling emergence. The temperatures to which the seeds were subjected were of 5, 10, 15, 20, 25, 30, 35, 40, and 45 °C under a photoperiod of 12 hours. The results were expressed in percentage of seeds with protruding primary root and percentage of normal seedlings. The substrata were Plantmax R , vermiculite, sand, and paper under a constant temperature of 30 °C and a photoperiod of 12 hours. Seedling emergence was determined in Plantmax R and vermiculite under a 50% shading in a green house. The optimum temperature was found between 25 and 35 °C. Seed germination did not differ for Plantmax R , vermiculite, sand, and paper. Sowing depths larger than 2 cm were found inadequate for seedling emergence. Keywords: substrate; temperature; depth of sowing; Leguminosae.