Ammonium/nitrate ratio in the initial growth of Guaco

Weyla Silva de Carvalho, Girlene Santos de Souza, Gildeon Santos Brito, Victor Gabriel Souza de Almeida, Janderson do Carmo Lima

Resumo


 

Guaco is a plant that has secondary metabolites with therapeutic properties of interest in human medicine, mainly due to its action in respiratory tract diseases. Nitrogen is a nutrient that participates in the formation of several compounds considered to be of great importance for plant growth. Its main forms of absorption by plants are ammonium (NH4+) and nitrate (NO3-) ions and unbalanced ratios can change plant growth. This study evaluates the effect of NH4+ and NO3- (100:0; 75:25; 50:50; 25:75, and 0:100) ratios in nutrient solution on the initial growth of Guaco plants. Guaco growth was affected by NH4+ and NO3- ratios. When NH4+ was supplied as the exclusive N source, Guaco plants reduced dry biomass production, number of leaves, leaf area, specific leaf area, leaf area ratio, total chlorophyll, and chlorophyll a and b indexes. Thus, increasing doses of the NO3- ion positively favored the initial growth of Guaco.

 


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DOI: http://dx.doi.org/10.15361/1984-5529.2020v48n4p367-373