BAKKE, E. A.; http://lattes.cnpq.br/5882604233023952; BAKKE, Erik Alves.
Résumé:
Knowledge of nutritional requirements of African mahogany (Khaya spp.) considering
growth and biomass distribution is important to its efficient cultivation, especially in Brazilian
semiarid conditions. Considering that African mahogany plantations in Brazil are recent, there
is a need for research on nutrition of this species. The objective of this study was to evaluate
the nutritional status of mahogany plants growing in field conditions in the semiarid region of
Ceará, with different ages, with emphasis on essential micronutrients. Data were collected
from 4 contiguous areas: the first planted with 5.4yearold
Khaya ivorensis plants, the second
with 5.4yearold
Khaya senegalensis, the third with 1.4yearold
K. ivorensis, and the fourth
with 2.4yearold
K. senegalensis. Analysis of the data considered two species (Khaya
ivorensis and Khaya senegalensis) in two life phases (Young 1.4to2.4yearold
plants and
5.4yearold
plants), resulting in four combinations of species and plant age. Freshly
harvested leaves of 40 mahogany plants were collected in four cardinal points at each
plantation. The leaves were sent to analysis in the Laboratory of Agronomic and
Environmental Analysis FULLIN,
in Linhares ES.
Boron content was higher in Khaya
senegalensis and showed a trend to be higher in young plants; Iron content was higher in
Khaya ivorensis, especieally in older plants. The two African mahogany plants are not very
demanding for Zinc; are well supplied with Iron, presenting adequate levels for their full
development. The content values of Boron in Khaya senegalensis leaves can be considered
high compared to other forest species and, independent of studied age and species,
micronutrient content values in leaf followed the decreasing order: B > Fe > Mn > Cu > Zn.