Abstract
ABSTRACT Agonandra brasiliensis is a tree from tropical forests, with a wide occurrence in the Brazilian Savannah region. Despite its potential as wood and for reforestarion, efficient protocols for its seedling production are still lacking. This study aimed to assess morphological characteristics for the seedling quality of A. brasiliensis, under nursery conditions, as a function of container volume and controlled-release fertilizer dose. The experiment was carried out in a 2 x 5 factorial scheme, testing two container volumes (1.8 L and 2.2 L) and five doses (0 g L-1, 1 g L-1, 2 g L-1, 4 g L-1 and 8 g L-1) of the encapsulated fertilizer Forth Cote™ (formulation NPK 15-09-12). The plots consisted of five homogeneous seedlings transplanted in polyethylene bags (15 cm x 35 cm) with washed medium sand substrate. The following characteristics were measured: shoot length; stem diameter; increases in length and diameter; total dry matter; shoot and root dry matters and the ratio between them. The Dickson Quality Index was also obtained. The seedling quality for morphological traits, such as shoot length, stem diameter and total dry matter, was especially favoured by treatments combining the controlled-release fertilizer at a dose around 5.0 g L-1 and container volume of 2.2 L.
Highlights
The forestry sector can be described as an important component of the Brazilian economy, as it contributes significantly to the generation of products, taxes, jobs and income (CNI 2017)
Among the potential species for use in reforestation in the north of Brazil is Agonandra brasiliensis Miers ex Benth. & Hook. f., which belongs to the Opiliaceae family and is locally known
A. brasiliensis was the species used, and seeds were collected from 15 tree populations in the reproduction stage, in an area of submontane dense ombrophilous forest (1o38’29”N and 60o58’11”W), with an emerging canopy, in Caracaraí, Roraima state, in March 2018
Summary
The forestry sector can be described as an important component of the Brazilian economy, as it contributes significantly to the generation of products, taxes, jobs and income (CNI 2017). The continuing expansion of this sector has driven forest investors to opt for the cultivation of native species (Beling 2016, IBÁ 2017) and, as such, there is a challenge to meet the demand for high-quality seedlings of suitable nutritional status to setup reforestation areas with economic purposes. Among the potential species for use in reforestation in the north of Brazil is Agonandra brasiliensis Miers ex Benth. F., which belongs to the Opiliaceae family and is locally known. 2 Empresa Brasileira de Pesquisa Agropecuária (Embrapa Roraima), Boa Vista, RR, Brasil
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