-The aim of this study was to assess the effect of different coatings on the physiological potential of stylosanthes cv. Campo Grande seeds. The treatments were: uncoated seeds; limestone + PVA glue; limestone + sand + PVA glue; limestone + activated carbon + PVA glue; calcium silicate + PVA glue; calcium silicate + sand + PVA glue; calcium silicate + activated carbon + PVA glue. Posteriorly, the seeds were analyzed for water content (WC), maximum diameter (MAD) and minimum diameter (MID), thousand seed weight (TSW), germination test, germination speed index (GSI), mean germination time (MGT), emergence, emergence speed index (ESI), mean emergence time (MET), shoot and root length, fresh and dry matter of shoot and root. The coating increased the TSW, MAD and MID and decreased its WC. The treatments comprising limestone + PVA glue and limestone + sand + PVA glue increased the germination time, but none of the treatments negatively affected the physiological seed quality. Treatment with calcium silicate + PVA glue was outstanding for germination speed index and fresh and dry matter of shoot and root in the stylosanthes cv. Campo Grande seeds coating.

No abstract

This study was conducted to evaluate the physiological quality of forage seeds after passage through the gastrointestinal tract of cattle, as well as the emergence of seedlings derived from these seeds. Three Fabaceae species were used: tropical kudzu, leucaena and calopo. One hundred grams of seeds of each species were offered, separately, to five bovines. After the start of the dispersion, the faeces of the animals were collected every 6 hours, in a total of 72 hours, being taken to the greenhouse immediately after each collection. The study evaluated the total number of seedlings in the stool, the lengths of roots and aerial parts, as well as the natural and dry seedling weight thirty days after the disposal of the faeces in the greenhouse. The experimental design consisted of randomized blocks, with twelve treatments (sampling periods) and five replications (cattle). The best performance for the total number of seedlings in the faeces of cattle was observed in the kudzu species. The length of the root, length of the aerial part and dry matter seedling weight was observed in the leucaena species, followed by kudzu. The calopo showed low results for all variables due to the high degradation of the seeds.

O objetivo do trabalho foi caracterizar a morfologia de frutos, sementes e plântulas, assim como determinar o substrato adequado para germinação e desenvolvimento inicial de plântulas de vinagreira. No estudo morfológico de frutos, foram observadas características internas e externas referentes à coloração, consistência, forma, número de sementes e deiscência. Para descrição das sementes, analisou-se a coloração, forma, textura e consistência dos tegumentos. Foram conduzidos testes de germinação nos substratos rolo de papel “germitest”, entre e sobre papel mata-borrão e entre areia, visando à caracterização das plântulas e a avaliação da qualidade fisiológica das sementes, sendo avaliadas quanto à germinação e vigor (índice de velocidade de germinação, comprimento de plântulas, massa fresca e seca de plântulas). O estudo morfológico das estruturas de vinagreira é importante para o conhecimento da espécie, favorecendo o desenvolvimento de técnicas adequadas de manejo. A germinação é epígea fanerocotiledonar, iniciando a partir do segundo dia após semeadura. Recomenda-se utilizar o substrato rolo de papel germistest para o teste de germinação em sementes de vinagreira com contagens aos sete (primeira contagem) e 14 dias (germinação) após a semeadura.