Aplicação de niacina ou tiamina promovem incremento no desenvolvimento de mostarda

Abstract

Stress caused by biotic and abiotic factors may compromise the development and productivity of species of agronomic interest. Thus, studies have been developed in order to improve the conditions of cultivation by the use of beneficial compounds, among which are the vitamins. The present work aimed to evaluate the effects of different concentrations of thiamine and niacin on the development of mustard plants cultivated between October and December in the region of Goiânia, Goiás, Brazil. Two experiments in a randomized blocks scheme were composed of six treatments defined by the application of 3 ml of solution containing different concentrations of niacin or thiamine (0; 200, 400, 600, 800, 1000 mg L-1). At 45 days after sowing, the relative content of "a", "b" and total chlorophyll, number of leaves, leaf area, fresh mass and shoot mass were evaluated. It was observed that the application of both vitamins increased the biometric characteristics of leaf area, fresh and dry weight of plants. The number of leaves was increased with the application of niacin, while the relative levels of chlorophyll were altered by the use of thiamine. It was concluded that the application of thiamine or niacin via soil promotes an increase in the biometric characteristics and the relative levels of "a" and total chlorophyll of mustard.