The purpose of this work was to assess biometric parameters of cedar seedlings (Acrocarpus fraxinifolius) associated with visual symptomatology of macronutrients deficiency, growth rate, and content and accumulation of nutrients in aerial parts of seedlings grown in nutritive solution. The trial was established in completely randomized design with seven treatments, four replications, and one plant per pot. Treatments consisted of complete nutrient solution, Hoagland and Arnon, and deprivation of the following selected single nutrients: N, P, K, Ca, Mg and S. Micronutrients were provided to all treatments. The following biometric parameters were assessed 90 days after the transplant: shoot height, root collar diameter, root and shoot dry weight. The Dickson index and the ratio given by roots dry weight and shoot dry weight were obtained, as well as the content and accumulation of nutrients in aerial parts of seedlings. The Sisvar statistical analysis system was run for analysis of variance, and averages were compared by means of Scott-Knott test at 5% significance. Treatments consisting of omissions of macronutrients were found to be limiting factors of plants growth and obtaining of seedlings shoot dry weight in the following order: N > P > K > Ca > Mg > S. Deficiencies of these macronutrients caused visible morphological abnormalities, where common symptoms of deficiency of N, P, K and Ca appeared before symptoms of deficiency of Mg and S. The content of nutrients found in aerial parts of seedlings of A. fraxinifolius grown in nutritive solution was greater for treatments consisting of deprivation of N, P and K. The content of nutrients found for treatments consisting of deprivation of Mg and S was not significantly different from that found for the complete nutrients solution.
The seedlings production process of forest plant species is found to be an important stage in the forest-based production chain. The present work was conducted in commercial nurseries aiming to assess morphological parameters of Eucalyptus clonal seedlings in the expedition phase. The experiment was performed in two nurseries located in the southern part (Nursery #1) and slopes' field (Nursery #2) of the State of Minas Gerais, Brazil. The Completely Randomized Design was used, with four treatments or clones (AEC 144 -Eucalyptus urophylla, AEC 244 -Eucalyptus urophylla, AEC 1528 -hybrid of E. urophylla x Eucalyptus grandis and AEC 100 -hybrid of E. urophylla x E. grandis), seven replications and 16 seedlings per plot. Seedlings were produced in 54 cm 3 tubetes according to nurseries protocols. The following parameters were assessed: plant height, collar diameter, dry matter, and seedlings quality index. The Sisvar statistical analysis system was run for Analysis of Variance, and averages were compared by means of Scott-Knott test at 5% significance. The clone AEC 1528 showed better quality standards at the Nursery #1, and clones AEC 100 and AEC 244 showed greater height and collar diameter at the Nursery #2. Therefore, seedlings from commercial nurseries under study showed adequate morphological quality standards for expedition and planting.
Modo de acesso: World Wide Web Inclui bibliografia 1. Meio ambiente 2. Gestão. I. Toledo, Fabiane dos Santos CDD-577 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos seus respectivos autores.
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