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Crescimento de mudas de espécies arbóreas nativas, adubadas com diferentes doses de lodo de esgoto seco e com fertilização mineral Native tree seedling growth when fertilized with different amounts of dry sewage sludge and mineral fertilizer

Crescimento de mudas de espécies arbóreas nativas, adubadas com diferentes doses de lodo de esgoto seco e com fertilização mineral Native tree seedlin

Crescimento de mudas de espécies arbóreas nativas, adubadas com diferentes doses de lodo de esgoto seco e com fertilização mineral Native tree seedling growth when fertilized with different amounts of dry sewage sludge and mineral fertilizer  
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The increasing volume of urban sewage nowadays generates considerable amount of sludge to be dis- posed of. One environmentally adequate destination could be the application of treated and stabilized sludge (biosolids) to forest plantations as fertilizer and soil conditioner. The purpose of this study was to analyze the feasibility of applying sewage sludge, evaluating its effects on native tree seedlings. The spe- cies evaluated were "aroeira-pimenteira" (Schinus terebinthifolia Raddi), "cabreuva-vermelha" (Myroxy- lon peruiferum L. f.), "pau-de-viola" (Cytarexyllum myrianthum Cham), "unha-de-vaca" (Bauhinia forficata Link), which are usually planted in forest restoration. Seedlings were cultivated in pots, containing a volume of 4 dm³ of soil, within a greenhouse. The study was developed in the proximity of Campinas, SP, Brazil, and installed in November, 2003. The design was entirely randomized including seven treatments: control; mineral fertilization; and different doses of sewage sludge (biosolids) complemented with potassium, due to the low concentration of this element in the sludge produced by the wastewater treatment plant of Barueri (Metropolitan region of São Paulo city). The results showed that the application of different dosages of biosolids promoted different responses in stem height and biomass production. The treatment with 20 g/ dm³ of dry sewage sludge promoted both the highest growth and the highest seedling biomass production, compared to the control treatment. All native tree species treated with the highest dosage of sewage sludge showed a growth similar to that of mineral fertilization. The seedlings of aroeira-pimenteira, pau-de-viola, and unha-de-vaca, all typical species of the initial succession in natural forest ecosystems, grew and pro- duced more biomass than cabreúva-vermelha, a typical species of the final forest succession.
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