Avaliação de métodos para superação da dormência em sementes de Brachiaria (syn. urochloa) Brizantha cv. Marandu

Abstract

The use of seeds of Brachiária Brizanta in the establishment of pastures It does With which Brazil occupies prominence in the agricultural economic. However For your use is importing you the overrun of a barrier imposed by the seeds: the numbness. In view of these considerations Objective of this work is to find methodologies for overcoming seed dormancy, to analyze the best substrate type and to evaluate the influence of storage on the process of overcoming seed dormancy as well as its physiological quality. The first step was to submit the seeds (a) treatments using immersion in sulphuric acid and hot water for several periods. Was Used In this experiment Two types of substrates, the paper Kill Blur and washed and sterilized sand. Initially the seeds were characterized as to germination (%), water content (%), micoflora (%), first count (%) and tetrazolium test. was chosen the best treatment of numbness overrun and then the seeds of Brachiária Brizantha They were packed in multileaf paper packaging for six months under non-controlled storage conditions and evaluated monthly for: germination (%), water content (%), micoflora (%), first count (%) and tetrazolium test. The results were analyzed With the Computational Program sisvar 5.6 (Ferreira,1998). The Treatment Using immersion in sulfuric acid It was efficient in overcoming numbness. The use of sand induced the overrun of the seeds ' numbness significantly higher than the other treatments. The Storage time influenced the decrease in numbness And Did not modify the Quality of the seeds, these features that have also not been altered by the packaging.