TECNOLOGIA ALTERNATIVA PARA A QUEBRA DE DORMÊNCIA DE SEMENTES DE MANIÇOBA (Manihot glaziovii, Euphorbiaceae)

Abstract

The maniçoba (Manihot glaziovii) owns good qualities as forage for the herds. The goal of this work was to evaluate forms for superation of numbness in maniçoba seeds. The research was developed in the Labotatório de Sementes-CCA/UFPB. It was used delineation entirely casualised, with four repetitions of 25 seeds. The treatments were: witness (without treatment) - escarification mechanical (SANDPAPER) - T2; escarification mechanical + immersion in water for 24 hours (SANDPAPER+24h) - T3; escarification mechanical + immersion in water for 48 hours (SANDPAPER+48h) - T4; immersion in hot water to 80ºC for 2' (80th+2min)- T5; immersion in hot water to 90ºC for 2' (90th+2min) - T6; immersion in hot water to 100ºC for 2' (100th+2min) - T7. The seeds, after treated, were sown in plastic arts trays contend sand and done daily countings for IVE's Determination, emergency first counting and percentage. The comparison of the averages was by Tukey's Test to 5% of probability. That the treatments T2 was observed and T3 were the ones that obtained best results of Emergency Velocity Indice (IVE), not differentiating to each other, however, in the treatments T5, T6 and T7 the emergency was null. For the first-rate results counting the treatment T3 was what it obtained better answer. Already for the results of emergency percentage T2 was what it introduced better result, ending up introducing 70% of emergency, followed by the treatments T3, T4, T1 respectively.