Abstract

ARCOS ALCIVAR, Franklin. Aporte de nutrientes por caída de hojarasca en plantaciones de Tectona grandis (Teca) en períodos de sequía. Novasinergia [online]. 2020, vol.3, n.1, pp.17-26. ISSN 2631-2654.  https://doi.org/10.37135/ns.01.05.02.

This work's objective was to study the leaf fall dynamics, its contribution of macronutrients in the drought period, and its relationship with the leaves' nutrients in the trees of Teak (Tectona grandis) at different times during the drought period. We used a randomized block design with four replications to evaluate soil texture, the soil moisture content in the dry period, leaf litterfall, and fresh leaf collection from selected trees for subsequent macro-element analysis. The results show that the soil's water content had dropped from 40% to 22% by the end of the drought. This decrease caused the fall of more than 95% of the leaves. The nutrient contributions in decreasing order were: Ca > N > K > P > Mg and were 181.32; 88.4; 46.7; 8.96; 6.46 kg/ha, respectively. In the seven-month dry period, the leaf drop was 8 t / ha. Nutrients N and P were mobilized from the leaves to other parts of the plant during the first five months of the dry period, demonstrating greater utilization efficiency. Based on the fertilization recommendations for Teak, the contribution of nutrients through its litter and nutrient contents in the soil, it is recommended that only N and K fertilization be carried out in the area under study.

Keywords : Dynamics of leaf fall; leaf decomposition; water deficit.

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