科研之友
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摘要
this study aimed to evaluate the effects of pregerminative mechanical scarification treatments, as well as heat pre-treatments on the germination of visgueiro-of-the-igap車 (parkia discolor spruce ex benth.) seeds. the first experiment, with a completely randomized design and four repetitions, evaluated these pre-treatments: control (without pre-treatment); clipping at the distal portion; clipping at the proximal portion (hilum); clipping at the proximal and distal portions; scraping at the distal portion; scraping at the proximal portion; scraping at the proximal and distal portions; perforation of the husk with a soldering-iron; and perforation by pyrography. in the second experiment, with a completely randomized design and factorial 2 (heat: dry and wet) x 4 (temperature: 40oc, 50oc, 60oc and 70oc) x 5 (period of conditioning: 6, 16, 24, 30 and 48 hours), with three repetitions. the clipping or scraping of the seeds in the proximal portion and proximal and distal portions allowed faster imbibition of the seeds (143-163% in three days and half), and consequently, better germination (98-100% in four days), germination speed rate (1,351-1,460) and average time of germination (3 days). the pre-treatment with heat (wet and dry), under different temperatures and different conditioning periods did not overcome the dormancy of p. discolor seeds.
