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Crescimento e nutrição de Pinus spp. em solos de baixa fertilidade no estado do Paraná

  • Consalter, Rangel
Publication Date
Aug 23, 2018
Repositório Digital Institucional da UFPR
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Abstract: With the general objective of increasing the knowledge of the nutritional deficiencies that trigger nutritional problems and limit the productivity of Pinus plantations in the region of Jaguariaíva/PR, and also study the adaptations of these plants for nutrient acquisition, four studies were conducted: 1) Nutritional diagnosis by omission of nutrients in six established plantations of P. taeda L. (Aged between 5 and 17 years) along the Jaguariaíva forest pole (Treatments: Complete, -NPK, -Micro (B, Cu, Mo and Zn), -K, -Zn, -Lime and Control), the plantations were evaluated for productivity belong 07 years; 2) In one of the six areas of study nº 1, a more specific study was carried out, about the effects of fertilization treatments on wood production and the assortment of logs, on the amount of accumulated litter and its colonization by the roots of P. taeda L .; 3) In the same area and occasion, the input and residual effect of the applied nutrients were studied in the biogeochemical cycle of nutrients of the forest ecosystem, through a punctual sampling of needles and litter with roots, and subsequent quantification of the concentration of nutrients, seven years after the application of the treatments; 4) A study of case was carried out with P. herrerae M. plantation, the study reports a shortcut in the geochemical cycle of nutrients, P. herrerae M. roots colonize still erect dead trunks of adjacent trees, benefiting from the release of nutrients there contained. In general lines, it was observed that the plantations of P. taeda L. present generalized deficiency of P and present a fabulous capacity for acquisition and maintenance of K. In general, the application of micronutrients and limestone on the litter of established plantations caused deleterious effects. However, lack of Ca, Mg and Zn were identified by the effects of treatments on the concentrations of these nutrients in the needles. The healing of deficiencies more limiting than that of K in established plantations of P. taeda L. possibly allows the plants to compensate for the lack of that nutrient (K) with adaptations in the cycle of the needles and radicular exploration of the litter. The present study provided favorable indications for the idea that Pinus plants would be adapted to high levels of Mn in the needles due to a cyclic phenomena of Mn self toxicity caused by chemical element characteristics associated with the nutrient acquisition form of plants. The superficial application of limestone in established plantations of P. taeda L. has the potential to affect the geochemical cycle of the nutrients Mn and S, even though these are not actually applied. P. herrerae M. plant roots can reach heights of metric magnitude above the soil while colonizing standing trunks of dead adjacent plants, this environment is more attractive than litter and soil, especially due to the availability of P and possibly lower acidity. Key-Words: Fertilization, NPK, Pinus taeda L., Litter layer, nutrientes cycling, roots.

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