Crescimento em campo de espécies florestais em diferentes condições de adubações.

Simões

Rev. bras. eng. agríc. ambient.

2012

R ESU M OConsiderando a crescente demanda por mudas florestais e a escassez de matérias-primas dos substratos utilizados para o crescimento das plantas, faz-se necessário avaliar novos componentes e formulações que assegurem a qualidade das mudas. Nesse experimento foram estudados o desenvolvimento e a qualidade de mudas clonais de Eucalyptus urophylla x E. grandis, provenientes de miniestacas, em função de nove composições de substrato produzidos a partir de vermiculita granulometria fina, casca de arroz carbonizada e fibra de coco em tubetes de 50 mL. Foram avaliados as propriedades físicas dos substratos, o desenvolvimento morfológico e a qualidade do sistema radicular das mudas, aos 90 dias após o estaqueamento. Os substratos com maior porosidade total promovem maior qualidade do sistema radicular o que, consequentemente, resulta em mudas com maior diâmetro, massa seca aérea e radicular e Índice de Qualidade de Dickson. Outros valores para as características físicas dos substratos, diferentes dos citados na literatura, também podem ser considerados adequados.Palavras-chave: sistema radicular, fibra de coco, eucalipto Quality of Eucalyptus urophylla x E. grandis cuttings as a function of substrateA B ST R A C T Considering the increasing demand for seedlings of plants for aforestation and the scarcity of raw materials for the substrates used for plant growth, it is necessary to evaluate new components and formulations that ensure the quality of seedlings. In this experiment the development and quality of production of Eucalyptus urophylla x E. grandis seedlings was studied through vegetative propagation, as a function of nine compositions of substrate, produced from fine-grained vermiculite, carbonized rice chaff and coconut fiber in hard plastic tubes of 50 mL as containers. The physical properties of substrates and morphological development and the quality of the root system of seedlings were evaluated at 90 days after staking. The substrates with higher total porosity promotes better quality of the root system, which consequently results in cuttings with larger diameter, shoot and root dry weight and Dickson Quality Index. Other properties for the physical characteristics of substrates other than mentioned in literature can also be considered adequate.

Section: Resultsunclassified

Qualidade de mudas clonais de Eucalyptus urophylla x E. grandis em função do substrato

Simões

Rev. bras. eng. agríc. ambient.

2012

“…The progressive increase in stem diameter of seedlings may serve as an indication of the full growth of these, as this feature is recognized as one of the best indicatives of total seedling quality (Carneiro, 1995), with crucial importance in the evaluation of seedling potential to survive in field (Souza et al, 2006).…”

Section: Resultsmentioning

confidence: 99%

Growth of Cupania vernalis seedlings produced under different substrates

Bortolini¹,

Koehler²,

Zuffellato-Ribas³

et al. 2016

Científica

Cupania vernalis (camboatá), it can be used in carpentry and landscaping, as well as for mixed plantings used for restoration of degraded areas. The objective was to evaluate the effect of different substrates, over time, in growth of Cupania vernalis seedlings. The experiment was conducted in nursery in the municipality of Santa Helena -PR. An amount of ten different substrates were tested, containing Plantmax®, leaf residue, sawdust, broiler litter, bovine manure and carbonized rice husk, in a completely randomized design with five replications of twelve seedlings in split-plots design. For 210 days, height and stem diameter were evaluated, dry mass of roots and shoots were also determined as well as its relationship between and the leaf area for ten seedlings of each substrate. Furthermore, water retention capacity and total porosity of substrates were determined. The most of substrates provided gradual increase in diameter and height of seedlings. Substrates with Plantmax ® + sawdust + bovine manure and substrate with Plantmax ® + carbonized rice husk + bovine manure, presented, respectively, the best results for diameter (2.0 mm and 1.9 mm) and height (4.5 cm and 4.6 cm), as well as root dry mass (0.29 g and 0.21 g) and dry mass of shoots (0.58 g and 0.47 g).Additional keywords: camboatá; native species; seedling production. ResumoCupania vernalis (camboatá) pode ser utilizada na marcenaria e no paisagismo, além de ser indicada para plantios mistos destinados à recomposição de áreas degradadas. O objetivo foi avaliar o efeito de diferentes substratos, ao longo do tempo, no crescimento das mudas de Cupania vernalis. O experimento foi realizado em viveiro no município de Santa Helena -PR. Foram testados dez diferentes substratos, contendo Plantmax®, resíduo de folha, serragem, cama de aviário, esterco bovino e casca de arroz carbonizada, em delineamento inteiramente casualizado, com cinco repetições de doze mudas, em esquema de parcelas subdivididas no tempo. Durante 210 dias, foram avaliadas altura e diâmetro do colo, e determinada a massa seca das raízes e da parte aérea, a relação entre estas e a área foliar, para dez mudas, de cada substrato. Determinaram-se também a capacidade de retenção de água e a porosidade total dos substratos. A maioria dos substratos proporcionou aumento gradativo no diâmetro e na altura das mudas. Os substratos com Plantmax® + serragem + esterco bovino e o substrato com Plantmax® + casca de arroz carbonizada + esterco bovino apresentaram, respectivamente, os melhores resultados para diâmetro (2,0 e 1,9 mm) e para altura (4,5 e 4,6 cm), assim como para a massa seca da raiz (0,29 e 0,21 g) e massa seca da parte aérea (0,58 e 0,47g).Palavras-chave adicionais: camboatá; espécie nativa; produção de mudas.

“…Nesta condição, observou-se uma grande variação da espessura do coleto entre os tratamentos na primeira época, quando se perceberam maiores médias para o T3. Para Souza et al (2006), a variação do diâmetro do caule, observada em mudas de uma mesma espécie após a germinação, é extremamente importante, visto que está associada à taxa de sobrevivência dos indivíduos. Ainda de acordo com estes autores, plantas que apresentam maior diâmetro do coleto, proporcionam maior capacidade de formação de raízes e, assim, maior possibilidade de sobrevivência.…”

Section: Discussionunclassified

Tratamentos pré-germinativos em sementes de espécies da Caatinga

Siqueira

Barros

Araújo

et al. 2017

J. Env. Anal. Progr.

A B S T R A C TSome species of the Caatinga present seeds with dormancy, a mechanism that allows germination when the environmental conditions permit its establishment and survival; this feature is advantageous for the perpetuation and undesirable for producers that need a fast production of these plants. The study aimed to evaluate the efficiency of the application of pre-germination treatments in Angico (Anadenanthera colubrina) (Vell.) Brenan, Jurema-branca (Piptadenia stipulacea Benth.) Ducke and Mulungu (Erythrina velutina Willd.). Two independent experiments were carried out at the Serra Talhada Academic Unit using Angico, Jurema-branca and Mulungu seeds, arranged in a completely randomized design, with four replicates and 15 seeds. The seeds were submitted to pre-germination treatments: T1-control, T2-mechanical scarification on the opposite end of the thread with wood sandpaper, T3-mechanical scarification on the opposite end of the thread with wood sandpaper + immersion in water at room temperature for 24 hours and T4-heat treatment with Immersion in water at 80°C for 2 minutes. The parameters evaluated the efficiency: germination percentage and rate of emergence (IVE), biometric data (30 days after sowing), as seedling height, the number of leaves and stem diameter. The seeds of Jurema-branca (P. stipulacea) and Mulungu (E. velutina), submitted to the pre-germinative treatments T2 and T3, showed better germinative performance, reflected in the growth of the seedling. The Angico (A. colubrina) was not sensitive to the application of the treatments, and its germination was nullified for the T3 treatment application. In all cases, variations of the parameters were observed because of the atmospheric conditions.