Effects of different light levels on the initial growth and photosynthesis of croton urucurana baill. in southeastern Brazil
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Universidade Federal de Viçosa
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Four levels of shading (full sunlight (0%), 30, 50, 70% of solar radiation interception on growth,chlorophyll concentration and photosynthetic rate were studied in Croton urucurana Baill., a pioneer plantspecies. This species seedlings are of potential interest for reforestation projects and recovery of degraded areas.The seedlings were grown in pots containing soil and sand (2:1) and later transferred to plastic bags of 3 dm3 andsubmitted to different levels of shading (30, 50, 70%) of solar radiation and full sunlight, as control. Theexperimental design was completely randomized with five replicates and each experimental unit was composed offive plants. The results suggest that plants submitted to 70% shading showed higher dry weight accumulation inleaf and root, and higher plant height and leaf area. However, the seedlings root system showed higher drybiomass under full sunlight. It was observed a tendency to increase chlorophyll concentration and to decreasephotosynthetic rate with the increase of the shading level
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