Efeito da adubação e calagem na quantidade de ectomicorrizas em serapilheira de Pinus taeda em Jaguariaíva, PR.

Resumo

Importância do uso de rizobactérias na produção de mudas florestais.

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Efeito de produto biotecnológico nos teores de nutrientes e CUB em mudas de Eucalyptus benthamii.

O uso de biotecnologias em viveiros florestais têm como finalidade a obtenção de mudas com melhor desenvolvimento, qualidade, resistência a pragas e doenças e nutrição adequada. O objetivo do trabalho foi avaliar a influência do produto na nutrição de mudas de Eucalyptus benthamii e no coeficiente de utilização biológica (CUB). O ensaio foi conduzido de maio a agosto/2011, com mudas de um viveiro comercial. Os tratamentos testados foram: testemunha (sem produto) e doses crescentes do produto (0,5 g; 1,0 g; 1,5 g; 2,0 g/muda), incorporado ao substrato comercial à base de casca de pínus, vermiculita e adubação de base, recebendo fertirrigação a partir dos 60 dias. Quantificou-se os teores dos elementos pelo método de digestão via seco para P, K, Na, Mg, Ca, Fe, Cu, Mn e Zn e por analisador elementar para N. Utilizou-se cinco amostras/tratamento, constituídas da biomassa aérea de dez plantas cada, e com os resultados realizou-se o cálculo do CUB. Realizou-se a regressão linear na análise de variância para determinação dos teores dos nutrientes e o CUB. Houve diferença estatística para os teores foliares dos elementos em N, Ca, Mn, e Zn (p > 0,01); K, Na, Mg (p > 0,05) e em s para N, Na, Mg (p > 0,01); e Zn (p > 0,05). Para o CUB, os elementos que apresentaram maior eficiência na produção de biomassa/unidade de nutriente foram, em ordem decrescente, N > Na > Mg > P > Ca > K > Cu > Zn > Fe > Mn. Conclui-se que o produto apresenta efeito positivo quanto ao aumento dos teores dos nutrientes na planta e sua eficiência na produção de biomassa aérea das mudas tratadas

Influência da vegetação nas propriedades físico-químicas de solos degradados na Mata Atlântica.

Resumo. 5° ELAETAO

Responses of Eucalyptus benthamii seedlings to the application of the organic fertilizer Bacsol.

Eucalyptus benthamii is a tree species commonly planted in subtropical areas, including the Southern Brazil, due to its tolerance to low temperatures and frosts. The success of E. benthamii plantation depends on the seedlings vigor during transplantation. We hypothesized that improvement of chemical and biological properties of growth substrate would produce more vigorous E. benthamii seedlings. Thus, we applied increasing doses (0, 0.5, 1.0, 1.5 and 2.0 g per seedling) of the organic fertilizer Bacsol, which carries a consortium of potential plant growth promoting microorganisms, on the substrate, and measured the growth and development of E. benthamii seedlings. Two experiments were performed in 2011 and 2012. The first experiment included measurements in four growth stages to estimate the relative growth rates. The second one ended at the time that seedlings reached standard heights for transplantation (about ± 20 cm). Measurements on plant height, stem diameter, shoot dry weight and relative growth rates indicated that the application of Bacsol improved E. benthamii seedlings vigor and decreased the time needed in nursery, from 150 days to 90 days. The best responses occurred at doses from 1.3 g to 1.5 g per seedling. The data demonstrated that application of Bacsol in substrate is a promising technology to increase E. benthamii seedlings vigor.Made available in DSpace on 2018-01-29T23:37:51Z (GMT). No. of bitstreams: 1 document.pdf: 222573 bytes, checksum: 8ba5b3598c93a4acbdbc9457ed253acb (MD5) Previous issue date: 2017-12-14bitstream/item/169037/1/document.pd

Diversity of arbuscular mycorrhizal fungi in forest ecosystems of Brazil: a review.

Plants can stablish symbiosis with arburcular mycorrhiza fungi (AMF), in which the fungus uses carbohydrates synthesized by plant photosynthesis in exchange for soil nutrients. AMF symbiosis may benefit plants by increasing the rates of nutrient uptake, tolerance to abiotic stresses, protection against pathogens and, by promoting resilience of forest species to adverse conditions. Knowledge about the diversity of mycorrhizas may help stablish relationships of species selection, AMF production and inoculation. Therefore, the objective of this review is to compile information to identify existing patterns in AMF diversity in Brazilian forest ecosystems. Compilation was based in 74 articles (in English, Portuguese and Spanish languages) searched in the Web of Knowledge and selected for having the keywords ?forest?, ?diversity?, ?mycorrhizal? and ?Brazil?, and that identified AMF species by spore morphology. Compilation resulted in a list of 164 AMF species and indicated that AMF species are not plant host specific but they are selected by environmental conditions where the host grows. Some AMF species were ubiquitous and some were rare in forest ecosystems. Rare AMF species may be an artefact of AMF identification because, in comparison to molecular tools, spore morphology may underestimate AMF diversity. Four AMF species, Acaulospora scrobiculata, Acaulospora foveata, Clareoideglomus etunicatum and Glomus macrocarpum, were ubiquitous to several biomes, existed in different stage of forest succession and seemed to be adapted to different forest managements. Therefore, A. scrobiculata, A. foveata, A. mellea, C. etunicatum and G. macrocarpum could have potential to be used as AMF inoculant in forest species.Made available in DSpace on 2019-05-21T00:48:42Z (GMT). No. of bitstreams: 1 2019C.AuerCerneDiversity.pdf: 463198 bytes, checksum: 47c05964e0b5a2139b94bcfb5078c9fd (MD5) Previous issue date: 2019bitstream/item/197465/1/2019-C.Auer-Cerne-Diversity.pd