RESUMO -Este estudo objetivou determinar a influência de diferentes doses de nitrogênio e formulações de substratos na miniestaquia de Eucalyptus dunnii Maiden. O minijardim clonal foi constituído de mudas com 90 dias de idade, em tubetes de 55 cm3, em substrato comercial à base de casca de pinus e vermiculita. As doses de N testadas foram de 0,2; 0,4; e 0,6 g L-1 (fonte utilizada: NH4NO3), em rega semanal com 10 mL da solução por tubete. Foram testadas cinco diferentes misturas com os seguintes substratos: substrato comercial à base de casca de pinus, vermiculita média, casca de arroz carbonizada e adubação incorporada. A sobrevivência das minicepas foi de 100% até a 10ª coleta, a partir da qual se observou pequena mortalidade (1 minicepa no tratamento 0,4 g L-1). As doses de N apresentaram relação direta com todas as características avaliadas, ou seja, quanto maior a dose de N, maiores os valores de produtividade das minicepas, sobrevivência das miniestacas e altura e diâmetro das mudas formadas. Os substratos apresentaram desempenho estatisticamente distinto na sobrevivência e formação das mudas (diâmetro do colo e altura) e vigor vegetativo das mudas formadas. Pelos resultados, pode-se afirmar que o processo de miniestaquia de E. dunnii é influenciado pela fertirrigação nitrogenada e pelo substrato, sendo aconselhada a dose de 0,6 g L-1 e o substrato formado pela mistura de substrato comercial à base de casca de pinus e vermiculita + vermiculita média + casca de arroz carbonizada (1:1:1) + adubação incorporada.Palavras-chave: Fertirrigação, nitrato de amônio e silvicultura clonal. EFFECT OF THE NITROGEN DOSE AND SUBSTRATE FORMULATIONS ON THE MINICUTTING TECHNIQUE OF Eucalyptus dunnii Maiden ABSTRACT -The aim of this study was to determine the influence of different nitrogen doses and substrate formulations on the minicutting technique of Eucalyptus dunnii Maiden. The clonal minigarden of 90-dayold seedlings was cultivated in the commercial substrate of pine bark and vermiculite (tubes of 55 cm3
O plátano (Platanus x acerifolia) tem despertado a atenção do setor moveleiro, em virtude das propriedades elásticas da madeira. Este trabalho teve por objetivo quantificar o material combustível existente no sub-bosque de um povoamento de plátano com 4,5 anos de idade, instalado em solo hidromórfico, em Santa Maria, RS. Em nove unidades amostrais, com 4 m2 cada, a biomassa combustível foi dividida em três classes de diâmetro (0,25; 1,0; 3,0 polegadas) com uso de gabarito. Cada classe foi pesada e teve uma amostra coletada e seca para determinação do peso seco total por hectare (em Mg ha-1). Não foram encontrados exemplares com diâmetro superior a 1,0 polegada. Os diâmetros até 0,25 e até 1,0 polegada corresponderam, respectivamente, a 85% (8,42 mg.ha-1) e 15% (1,52 mg.ha-1) do total de biomassa no sub-bosque do povoamento. Os valores apresentaram-se relativamente baixos, provavelmente devido ao elevado grau de hidromorfia do solo na área. QUANTIFICATION OF COMBUSTIBLE MATERIAL IN THE SUB-FOREST OF A Platanus x acerifolia SETTLEMENT Abstract The plane tree (Platanus x acerifolia) has been interesting for the furniture section, because of the elastic properties of the wood. This work had as objective to quantify the existent combustible material in the sub-forest of a 4,5 years old plane tree settlement, installed in hydromorfic soil, in Santa Maria, RS. In nine samples units, with 4 m² each, the combustible biomass was divided in three diameter classes (0,25; 1,0; 3,0 inches) with form use. Each class was weight and the samples were collected for the determination of the total dry weight in an hectare (mg.ha-1), individuals with a diameter superior to 1,0 inch werent find. The diameters up to 0,25 and up to 1,0 inch they corresponded, respectively, to 85% (8,42 mg.ha-1) and 15% (1,52 mg.ha-1) of the total biomass in the sub-forest of the settlement. The values seemed to be relatively low, probably due to the hydromorfic level of the soil in the studied area.
The study of the ixodofauna in fragments of woods in an urban area is important to the knowledge of species of tick and the dynamic among wild and domestic hosts, allowing to subsidize proposals for the conservation of the fauna and the control of zoonoses such as Brazilian spotted fever. To accomplish the survey, CO2 traps were built up in six different sites of the forest, during a oneyear period, totalizing 12 collections. The ixodids were collected by monitoring the traps and the adjacent vegetation during two hours and put in ethanol 70° GL. At the laboratory they were identified under the stereoscopic optics. At the end of a one-year period of study 2.122 ixodids were colleted, being 793 larvae (37,3%) and 1.277 nymphs (57,8%) of the genus Amblyomma and 102 were adults (4,9%) of the Amblyomma species. The most constant species was Amblyomma cajennense, present in 83,33% of the collections (71 specimen) followed by Amblyomma dubitatum, present in 50% (30 specimen), and Amblyomma calcaratum, 8,33% (one specimen). The observations showed that in the observed environment the populations of Ixodidae have an aggregate distribution, possibly because of the aggregate distribution of the resource, in the case wild hosts.
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