Light intensity and type of container on producing Cassia grandis L. f. seedlings

Abstract

A B S T R A C TThis study aimed to determine the effects of the luminosity and type of container on producing Cassia grandis seedlings. Thus, in a substrate composed by topsoil + wood powder (1:1) the seedlings were grown into plastic tubets containing 0.3 dm 3 of such substrate, or into plastic pots containing 1.0 dm 3 of the same substrate, and subjected to 50 and 25% shading or full sunlight. The assessments were performed every two weeks by measuring plant height and stem diameter, during eight weeks period. At the end of this period, the leaf area, dry mass of shoots and roots, the ratio between height of plant/diameter of stem, and the Dickson quality index were also assessed. The experiment was carried out in a completely randomized design with treatments arranged in a 3 x 2 factorial [3 luminosity levels (50, 25% shading and full sunlight) x 2 types of containers (plastic tubets and clay pots)] with four replicates of 10 seedlings each. Means were compared by Tukey test at 0.05 probability level and adjustments for the non-linear regression polynomial curves for the assessed characteristics were computed in function of time. Shadings of 25 and 50% were the best alternatives to luminosity; and the tubets were the most suitable containers for production of Cassia grandis seedlings.Intensidade da luz e do tamanho do recipiente na produção de mudas de Cassia grandis L. f. R E S U M OEste estudo teve, como objetivo, determinar os efeitos da luminosidade e do tipo de recipiente na produção de mudas de Cassia grandis; para isto foram cultivadas, em um substrato composto por terra vegetal + pó de madeira (1:1), as mudas, em tubete contendo 0,3 dm 3 deste substrato e em vasos de plástico contendo 1,0 dm 3 do mesmo substrato as quais foram submetidas aos sombreamentos de 50 e 25% e pleno sol. As avaliações foram realizadas a cada duas semanas medindo-se a altura das plantas e o diâmetro do caule, durante o período de oito semanas e ao final da oitava semana a área foliar, a massa seca da parte aérea e raiz, a razão entre altura de planta/diâmetro do caule e o índice de qualidade de Dickson, também foram determinados. O experimento foi conduzido em delineamento inteiramente casualizado, com os tratamentos arranjados em esquema fatorial 3 x 2 [3 níveis de luminosidade (50 e 25% de sombreamento e sem sombreamento) e dois tipos de containers (tubetes de plástico e vaso de plastico)], com quatro repetições cada uma contendo 10 plantas As médias foram comparadas pelo teste de Tukey em nivel de 0,05 de probabilidade e os ajustes das curvas polinomiais de regressão não linear para as características avaliadas foram calculados em função do tempo; os sombreamentos de 25 e 50% foram as melhores alternativas de luminosidade e os tubetes foram os recipientes mais adequados para a produção de mudas de Cassia grandis.

Morphophysiological quality of yerba mate plantlets produced by mini-cuttings

“…Mart.) (GASPARIN et al, 2014), Jatropha curcas (L.) (AJALA et al, 2012), Cassia grandis (L.) (LEAL et al, 2015) and Anadenanthera macrocarpa (Benth. Brenan) (ALVES et al, 2012).…”

Light Levels Influence on Development and Leaves Reflectance Index of Imperial Zoysia Grass / Influência De Níveis De Luz No Desenvolvimento E Índice De Refletância Das Folhas De Grama Esmeralda Imperial

“…Means followed by the same lower case letters in the columns do not differ at 5% of probability level by the Tukey test. Díez et al (2017), Taiz et al (2017 and Leal et al (2015) reported that there are many factors, which affect plant development such as abiotic ones.…”

Effect of Various Shading Levels on Growth of Seedlings of Eggplant (Solanum Melongena L.) Under Greenhouse Conditionin the Tropical Region

“…[14] foundthat light irradiation is highly effective for eggplant seed germination. However, [10] said that seedlings should not be fully exposed to direct sunlight because they might be developmentally stunted compared to seedlings being shaded. Seedling quality is very important due to its subsequenteffect on plant performance.The productivity of vegetables can be increased,therefore, this study intends to determine the optimal shade level for producing eggplant seedlings in a greenhouse in a tropical region.…”