NITROGEN IN THE INITIAL GROWTH AND PHOTOSYNTHESIS PHOTOCHEMICAL IN Alibertia sessilis (Vell.) K. Schum

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DOI:

https://doi.org/10.5380/rf.v50i2.64044

Palavras-chave:

chlorophyll-a fluorescence, mineral nutrition, principal components analysis, marmelinho, Dickson quality index.

Resumo

The use of N fertilizers can contribute to seedling production in native species, such as Alibertia sessilis (Vell.) K. Schum, a fruit plant of the Cerrado ecoregion. Considering that there are few studies on mineral nutrition for this species, the aim of this study was to evaluate the effect of N on the growth and photosynthesis photochemical of A. sessilis. The experiment was carried out in plastic pots in a greenhouse with five N (urea) concentrations: 0, 25, 50, 75, and 100 mg kg-1. The experimental design used was a randomized block design with four repetitions. At day 180 after transplantation, morphometric and photochemical characteristics, including biomass and seedling quality, were evaluated. Seedling survival, the stem diameter of the harvest, and the height/diameter ratio were not influenced by N. The maximum height was 14.38 cm with 54.2 kg-1 N. The greatest number of leaves and value of the chlorophyll index were found in seedlings produced with maximum doses of N. The photochemical characteristics of photosynthesis, except initial fluorescence, were positively influenced with N concentrations between 60-85 mg kg-1 N. The largest fresh leaf and stem biomass was 2.391 and 0.257 g plant-1 with 54.0 and 33.0 mg kg-1 of N, respectively. The multivariate analysis of the major components explained 79.81% of the remaining data variability. The seedlings of A. sessilis responded positively during the initial growth phase, reflected in their biomass, with N concentrations close to 50.0 mg kg-1.

Biografia do Autor

Cleberton Correia Santos, Faculdade de Ciências Agrárias, Universidade Federal da Grande Dourados

Graduado em Agroecologia (2013) pela Universidade Estadual de Mato Grosso do Sul (UEMS). Mestre e atualmente é doutorando em Agronomia - Área de Concentração: Produção Vegetal pela Faculdade de Ciências Agrárias (FCA) da Universidade Federal da Grande Dourados (UFGD). Tem experiência em Agroecologia, atuando principalmente nos seguintes temas: Uso de Resíduos Sólidos Orgânicos, Produção de Mudas, Propagação de Plantas, Substratos, Plantas Medicinais com ênfase em nativas do Cerrado, Crescimento, Fisiologia e Nutrição de Plantas Cultivadas.

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Publicado

30-04-2020

Como Citar

Santos, C. C., Ortega, R. da C. C., Silvério, J. M., Poyer, H. C., Scalon, S. de P. Q., & Vieira, M. do C. (2020). NITROGEN IN THE INITIAL GROWTH AND PHOTOSYNTHESIS PHOTOCHEMICAL IN Alibertia sessilis (Vell.) K. Schum. FLORESTA, 50(2), 1379–1388. https://doi.org/10.5380/rf.v50i2.64044

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