HIGHLIGHTS:
The use of chicken manure contributes for seedling Alibertia edulis production.
A. edulis seedlings presented physiological adjustments in the two light contrasts.
For quality A. edulis seedlings should use 6.24 g CM kg-1 under shade or 4.16 g CM kg-1 under full sun.
ABSTRACT
Organic residue in the substrate and the availability of light influence the production of high-quality seedlings for ex situ cultivation of native forest species. This study aimed to evaluate the effect of doses of chicken manure incorporated in the soil and shading levels on the morphophysiological responses and quality of Alibertia edulis (Rich.) A. Rich seedlings. Five doses of chicken manure (CM) were tested, 0.00, 2.08, 4.16, 6.24, and 8.32 g CM kg-1 soil, under two shade conditions, 0% (full sun) and 50% shading. At 215 days after transplanting, the maximum height obtained for A. edulis was 47.35 cm with 5.64 g CM kg-1 soil under 50% shade. Shaded seedlings had a higher number of leaves. The maximum leaf and root areas were 796.64 and 118.83 cm2 with 5.32 and 4.21 g CM kg-1 soil, respectively, both under 50% shade. Seedlings in 0% shade had lower physiological indices. Shading levels did not affect stomatal limitation, but CM contributed to physiological efficiency. Shoot biomass was higher under 50% shade with higher CM doses. The highest quality indexes occurred with 3.98 and 6.28 g kg-1 CM under 0 and 50% shade, respectively. A. edulis seedlings responded positively to the addition of CM to the soil and presented plasticity under contrasting light conditions. A. edulis seedlings produced under 50% shading with the addition of 6.24 g CM kg-1 soil presented high morphophysiological and seedling quality indicators. The addition of 4.32 g CM kg-1 soil contributed to high seedling quality under full sun conditions.
Key words:
chicken manure; Dickson quality index; shading; physiological adjustment; stomatal limitation
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* - Significant at p ≤ 0.05 by F test; Means with equal letters do not differ statistically from each other by t test at p > 0.05); C.V. - Coefficient of variation; FS - full sun (0% shade); S - shading (50% shade)
* - Significant at p ≤ 0.05 by F test; Means with equal letters do not differ statistically from each other by the t test at p > 0.05; C.V. - Coefficient of variation; FS - full sun (0% shade); S - shading (50% shade)
* - Significant at p ≤ 0.05 by F test; Means with equal letters do not differ statistically from each other by the t test at p > 0.05; C.V. - Coefficient of variation; FS - full sun (0% shade); S - shading (50% shade)
