Root pruning and Osmocote® provides better Jatoba seedlings

Abstract

The species Hymenaea courbaril L. (Jatoba) is widely used in the timber industry. However, its population was reduced due to high exploitation rate, being at risk of extinction. Therefore, production of seedlings of this species should be improved to meet the demand of reforestation programs. Given the above, this study evaluates the effect of Osmocote ® rates and root pruning on the growth of Jatoba seedlings transplanted into plastic bags. A randomized complete block design was used in a 5 x 3 factorial scheme, corresponding to five rates of Osmocote ® fertilizer (0.0; 2.0; 4.0; 6.0; and 8.0 g L-1) and three root pruning intensities (0%; 25%; and 50%). At 105 days after transplantation, the following were evaluated: plant height, stem diameter, number of leaves, shoot dry weight, root dry weight, total dry weight, height/stem diameter ratio, and Dickson quality index. Rates below 4.0 g L-1 or above 6.0 g L-1 decreased seedling quality. The most prominent variables in this study were plant height, total dry weight, and number of leaves of H. courbaril seedlings. Osmocote ® rates between 4.4 and 6.6 g L-1 combined with 25% root pruning provided the best results for the growth of transplanted Jatoba seedlings.

Desenvolvimento de mudas de cacau em função da concentração de biostimulante d’raz®

“…With developed root systems, there's greater stability, as well as increased water and nutrient absorption (FREITAS et al, 2009). The RDM variable holds significant importance in plant development, as greater root formation enhances growth capacity and survival potential in the field (AMORIN et al, 2020).…”

Adubação Fosfatada Proporciona Melhores Mudas De Jatobá (Hymenaea Courbaril L.)

“…A superioridade do incremento de crescimento para a variável MSR pode estar relacionada a poda inicial do sistema radicular realizada no momento do transplantio. Amorin et al, (2020) constaram que a poda leve do sistema radicular da H. courbaril, aumenta a massa seca da raiz. Com sistemas radiculares desenvolvidos, maior facilidade de sustentação, além de maior absorção de água e nutrientes (FREITAS et al, 2009).…”

“…Conforme os autores, o P 2 O 5 (SFS) influenciou negativamente à formação do sistema radicular das mudas, fato que pode estar ligado a comportamentos intrínsecos da espécie. A variável MSR apresenta uma expressiva importância no desenvolvimento das plantas, pois, com maior formação de raízes, maior sua capacidade de crescimento e maior potencial de sobrevivência em campo (AMORIN et al, 2020).…”