Intensity of seed dormancy of Parkia Pendula

Upon dispersion of the seeds of Parkia pendula, a part immediately germinates and another part is dispersed with an intact seed coat. Therefore, the goal was to evaluate the efficiency of methods for overcoming seed dormancy, as well as the ability to determine the potential for germination of seeds with different intensities of dormancy and to form normal seedlings. The experiment was conducted in a completely randomized design, whose treatments were: control (seeds without any pre-treatment; [T.sub.1]), soaking in water at 80°C ([T.sub.2]), soaking in water at 80°C with subsequent soaking for 24h to 23 ± 2.1°C ([T.sub.3]), topped and tailed seeds on the side and middle third ([T.sub.4]) and area opposed to the micropyle ([T.sub.5]), and seeds scarified in an area opposite to the micropyle with sandpaper #100 ([T.sub.5]). The analyzed characteristics were germination, normal, abnormal seedlings, as well as hard and dead seeds. The intensity of P. pendula dormancy affects the pre-germination treatments and the most effective are the cutting on the side / middle third or area opposed to the micropyle of seeds. Moist heat treatment at 80°C is insufficient for effective soaking of dormant seeds and, when followed by soaking for 24h, reduces germination. Seed scarification at an area opposite to the micropyle favors germination, but increases the risk of abnormal seedlings.