Abstract
The use of physical protectors has been considered as an efficient technique for tillage farming of different species, mainly native ones. Based on the importance of the species, Peltophorum dubium for revegetation of degraded areas, this study evaluated the emergence, survival and initial development of P. dubium seedlings under the influence of physical protectors with different filters. Thus, the following treatments were adopted: absence of physical protector (APP), transparent physical protector (TPP), transparent physical protector + blue cellophane (BPP) and transparent physical protector + red cellophane (RPP). The evaluated characteristics were: emergence velocity index (EVI), seedling survival and emergence percentage, plant height, leaf area and root collar diameter. All of these physical protectors increased the mean values of EVI and survival. In conclusion, the emergence speed and initial development of P. dubium (Spreng.) seedlings grown in the interior of physical protectors, independent on the filters, presented positive results. The reduction on the light intensity interferes positively in the initial growth of these plants. Key words: Native species, reforestation, seedlings.
Highlights
Since the beginning of the millennium, the reduction of forest resources and the increase of the consumption of wood products were widely discussed because of the increasing need of reforested areas, mainly because, few existent native areas are restricted to preservation, parks and reserves (Mattei et al, 2001)
The real behavior or P. dubium in reforestation areas with physical protectors at field level was never evaluated. This procedure is crucial, mainly during the critical period for the establishment of one seedling comprehend in the first 30 days (Meneghello and Mattei, 2004). It is during this period of time, the protection of the seeds is essential, mainly because they can be exposed to dryness, soil compaction caused by strong rainfalls, vulnerability to be attack by birds and ants and by the breaking in the loading and transportation of the seedlings
There are no reports of physical protectors associated with colored polymers. With all these aspects mentioned above, this study aim to evaluate the influence of physical protectors of different filters in the initial development of P. dubium (Spreng.) Taub. seedlings
Summary
Since the beginning of the millennium, the reduction of forest resources and the increase of the consumption of wood products were widely discussed because of the increasing need of reforested areas, mainly because, few existent native areas are restricted to preservation, parks and reserves (Mattei et al, 2001). It is during this period of time, the protection of the seeds is essential, mainly because they can be exposed to dryness, soil compaction caused by strong rainfalls, vulnerability to be attack by birds and ants and by the breaking in the loading and transportation of the seedlings In this way, the use of physical protectors in the sowing of forest species is important; it is favorable to the formation of an adequate micro clime to the germination and survival of the seedlings (Lahde, 1974). With all these aspects mentioned above, this study aim to evaluate the influence of physical protectors of different filters in the initial development of P. dubium (Spreng.) Taub. seedlings
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