Nutritional status and biomass of african mahogany seedlings grown with nutrient solution in the Northern Amazon
DOI:
https://doi.org/10.5902/1980509819904Schlagworte:
Khaya senegalensis, Seedling production, Mineral nutritionAbstract
The objective of this work was to determine aspects about growth variables and dry mass partition of Khaya senegalensis seedlings and the nutrient absorption rate, depending on the seasons and mineral fertilization. The experimental design used was completely randomized, in a 2x6 factorial scheme. Two levels of nutrient solution factor (without addition) and six levels of time factor (0; 60; 80; 100; 120 and 140 days). Four replications were used, each one consisting of 10 seedlings. To evaluate the quality of the seedlings, morphological parameters, relationships and quality indexes were considered: Height (H; cm); collar diameter (CD; mm); shoot dry mass (SDM; g plant-1); dry root mass (DRM; g plant-1); total dry mass (TDM = SDW + RDW; g plant-1); shoot dry mass and root dry mass ratio (SDM/DRM); robustness index (RI = H / DC; cm mm-1); the Dickson quality index (DQI) and the accumulation of macronutrients in the shoots and root system. It is recommended to add solution for seedlings of Khaya senegalensis from 100 days after transplanting in the selected nursery in the Amazon. The maintenance of Khaya senegalensis seedlings with the use of the nutrient solution provides the best conditions for the use of macronutrients and obtaining suitable seedlings for the field in 140 days after transplanting in the selected nursery in Roraima.
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