Influence of Substrates, Cultivation Conditions and NPK on the Production of Teak Seedlings Tectona grandis Linn. f., Verbenaceae from Strains, Daloa (Haut Sassandra, Ivory Coast)

Abstract

This study aimed to evaluate the efficiency of vegetative propagation of teak by stump, by examining the influence of the type of substrate, growing conditions and the supply of NPK fertilizers on production. In this context marked by strong international demand for this forest species prized on the tropical wood market, whose multiple uses have led to the progressive depletion of natural stocks. The experimental design was a plot divided into three factors. The first factor (growth conditions) included two levels (outdoors and under firewood), the second factor (growth substrates) included two levels (decomposed coffee parchment and decomposed sawdust), and the third factor NPK with seven levels (0; 5; 10; 20, 30; 50; 100 g/L) with three replicates for each factor. The parameters evaluated included bud burst rate (Td), average plant height (H), average leaf number (NF), leaf area (SF), average tap length (Lp), and average root number (Nr).  The best bud break rate of 93.33% was recorded in the open air with sawdust at a dose of 5g/L. In terms of average root number and tapping length, the shaded area was found to be the best condition with the NPK dose of 50 g/L with 19±11.41 roots and 12.87±3.51 cm, respectively. These results show that teak is well adapted to vegetative propagation by stump.