Sombreamento na emergência de plantulas e no crescimento inicial de Dipteryx alata Vog.

摘要

http://dx.doi.org/10.5902/198050986611 This work was carried out in order to evaluate the potential of germination of the seeds and the seedlings growth of? baru (Dipteryx alata) in different levels of shading. To evaluate the emergency, the sowing was realized in trays of cells contends Plantmax? substratum + land + sand + chicken manure in proportion of (1: 1: 1: 0,5) and kept? in the full sun, 50% and 70% of shading. The experiment was realized in design entirely randomized with three levels of shading in four repetitions of 25 seeds. It was evaluated the percentage and the velocity of the emergency index. To evaluate the initial growth, the seedlings were transplanted and, three repetitions of 15 changes totalizing 45 seedlings were kept in its respective shading.? The experiment was realized in a complete randomized design in factorial 3 (shading levels) x 5 (times of evaluation for height, diameter of collect, total chlorophyll, transpiration, stomatal conductance and photosynthetic rate) and 2 (times of evaluation for leaf area, length of root, fresh and dry mass). The shading levels did not influence the percentage and the velocity index of seedling emergency.