Application of increasing doses of phosphor in Cordia trichotoma seedlings

• Autor(a) principal: Leite Cunha , Fernanda
• Data de Publicação: 2021
• Outros Autores: Soares de Almeida, Rodolfo, Carvalho Diniz, Paloma, Augusto Campos, Vinícius, Dias Gonzaga, Manuela, Amaral de Melo, Lucas
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista de Ciências Agrárias (Belém. Online)
• Texto Completo: https://ajaes.ufra.edu.br/index.php/ajaes/article/view/3468
• topic: louro-pardo; phosphate fertilization; seedling quality; forest nutrition; Forestry; Forest Nutricion; louro-pardo; adubação fosfatada; qualidade de mudas; nutrição florestal; Silvicultura; Nutrição Florestal

The objective of this work was to evaluate the initial response of Cordia trichotoma seedlings to increasing doses of phosphorus application. The experiment was carried out in a randomized block design, with five treatments (0, 150, 300, 450 and 600 mg dm-3 of P) in five replications. It was evaluated at 30, 60, 90 and 180 days at height, stem diameter, robustness index (H/DC), shoot dry mass (MSPA), root system dry mass (MSR), MSPA/MSR, total dry mass (MST) and the Dickson Quality Index (IQD). Furthermore, the maximum technical efficiency doses (DMET) were calculated. The variables showed a quadratic growth behavior for all variables, demonstrating the importance of fertilization with P in the growth of seedlings. However, the dose of 600 mg dm-3 showed symptoms of toxicity in the seedlings. The indicated DMET for fertilization with P was 221.43 mg dm-3, at 180 days.