Seedling quality of Agonandra brasiliensis in response to different Osmocote® doses and recipient volumes

Abstract

The objective of this work was to evaluate seedlings quality of the tree species Agonandra brasiliensis under different doses of the controlled release fertilizer (CRF) Osmocote® and recipient volumes. The experiment was set up in a factorial design for two recipient volumes (1.8 L and 2.2 L) and five CRF doses (0.0; 0.5; 1.0; 2.0; and 3.0 g L-1 of substrate). Four repetitions of one plant each were used. After transplanting seedlings, stem height, stem collar diameter, and the robustness index (RI) were measured in a monthly basis during eight months. The highest seedlings growth was observed with the CRF Osmocote® dose of 2.0 g L-1 and recipients of 2.2 L. The treatment with CRF dose of 2.0 g L-1 in 240 days presented higher initial accumulated growth in height of A. brasiliensis seedlings (mean = 31.38 cm). Seedlings under the dose of 2.0 g L-1 presented 85.90% increase of stem height in relation to the control (substrate without CRF). CRF Osmocote® had positive effect on growth of A. brasiliensis seedlings. Growth was influenced by the different CRF doses and recipient volumes, both for the variables stem height and stem collar diameter and for the RI. The dose 2.0 g L-1 allowed greater accumulated growth in height and diameter in 240 days.

Produção de mudas de açaizeiro solteiro submetidas a doses de nitrogênio e potássio

“…It is observed that only potassium fertilization influences the PH/SD ratio, demonstrating a quadratic effect, with the dose of 77.50 mg dm-3 causing the lowest relationship between the variables. Mota et al (2021) mention that it is possible to monitor the quality of the seedling already implanted in the field using the variable mentioned above. For the SDM/RDM ratio, nitrogen fertilization was significant, resulting in a linear increase, indicating biomass allocation satisfactorily through the doses applied.…”

Container volume and doses of maximum technical efficiency of controlled-release fertilizer on the morphological quality of Cordia alliodora seedlings in Roraima

“…The forestbased sector can be described as an important component of the Brazilian economy, because it contributes significantly to the gen eration of products, taxes, jobs and income (Smiderle et al, 2021 a). The growing expansion of this sector has driven forest investors to opt for the cultivation of native species in the state of Roraima (Smiderle et al, 2022).…”