Different harvest times and physiological quality of coriander seeds

Abstract

A B S T R A C TThe season of harvest is one of the most important factors influencing seed quality. This study evaluated the effect of different harvesting times on the physiological quality of Coriandrum sativum L. seeds, cv. Palmeira. The experimental design was completely randomized, with six treatments (harvest times) and four replications. The experiment was conducted during the months of April to October 2010. The first moment to harvest seeds was carried out 15 days after full bloom, when approximately 50% of plants were in flowering phase. Other harvests (22, 29, 36, 43 and, 50 days after bloom) were carried out at 7 days intervals until the seeds reached 16.0% of moisture, which occurred in the 6 th harvest. Immediately after each harvest, the seeds were analysed for water content, germination and vigor (first count, seedling emergence and emergence rate index). The harvest season most suitable for C. sativum seeds cv. Palmeira occurred between 46 and 50 days after flowering, when the seeds have the highest physiological quality and moisture content between 20 and 16%.Diferentes épocas de colheita e qualidade fisiológica de sementes de coentro R E S U M O A época de colheita é um dos fatores mais importantes que influencia a qualidade das sementes. Este estudo avaliou o efeito de diferentes épocas de colheita na qualidade fisiológica de sementes de Coriandrum sativum L., cv. Palmeira. O delineamento experimental foi inteiramente casualizado, com seis tratamentos (épocas de colheita) e quatro repetições. O experimento foi conduzido durante os meses de abril a outubro de 2010, em que a primeira época de colheita das sementes foi realizada aos 15 dias após a floração quando aproximadamente 50% das plantas apresentavam flores. As demais colheitas (22, 29, 36, 43 e 50 dias após floração) foram realizadas em intervalos de 7 dias até as sementes atingirem aproximadamente 16% de umidade, o que ocorreu na 6ª colheita. Imediatamente após cada colheita as sementes foram avaliadas quanto ao teor de água, germinação e vigor (primeira contagem, emergência de plântulas e índice de velocidade de emergência). A época mais adequada para a colheita de sementes de C. sativum cv. Palmeira ocorreu entre 46 e 50 dias após a floração quando as sementes apresentaram a mais alta qualidade fisiológica e teor de umidade entre 20 e 16%.

Harvest times and seed germination of three safflower genotypes

“…During harvested at different times, decline steady in seed water content was observed. This corresponds to physiological maturity of seeds (CARVALHO & NAKAGAWA, 2012;ALKIMIM et al, 2016). However, notably the water content of the seed alone is not a good indicator of physiological maturation, as it can be influenced by genetic and environmental conditions.…”

“…Studies into seed maturation and harvest are important in minimizing the effects of deterioration caused by prolonged time spent in the field. In addition, seed production can be increased, since harvesting at the optimal time decreases the number of immature seeds (ALKIMIM et al, 2016). In addition to varying for each crop, the point of maturity may vary depending on the cultivar (CARVALHO &NA-KAGAWA, 2012).…”