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A aplicação do medidor indireto de clorofila SPAD-502 tem sido estudada para diversas culturas e com resultados satisfatórios, para predição do estado nutricional de nitrogênio. O objetivo deste trabalho foi avaliar o emprego do SPAD-502 na avaliação dos teores foliares de clorofila, N, S, Fe e Mn, em algodão herbáceo, cultivado em casa de vegetação. Foram instalados quatro experimentos, e foram estudadas doses de N (1,5, 7,5, 15 e 22,5 mM L-1), S (0,2, 1, 2 e 3 mM L-1), Fe (10, 50, 100 e 150 µmol L-1) e Mn (10, 50, 100 e 150 µmol L-1), equivalentes em todos os casos a 0,1, 0,5, 1,0 e 1,5 vez a concentração normal da solução Hoagland & Arnon, respectivamente. A clorofila a se relaciona mais fortemente com as leituras SPAD do que as clorofilas b. As leituras SPAD correlacionaram-se, positivamente, com os teores foliares de N e negativamente com os de S. Os teores foliares de Fe e Mn não apresentaram correlação com as leituras SPAD. The application of indirect meter of chlorophyll SPAD-502 has been studied for several cultures and with satisfactory results in evaluation of the nutritional state of nitrogen. This work aimed at evaluating the employment of SPAD-502 in the leaf content analysis of chlorophyll, N, S, Fe and Mn in herbaceous cotton under greenhouse conditions. Four experiments were installed to study doses of N (1.5, 7.5, 15 and 22.5 mM L-1), S (0.2, 1, 2 and 3 mM L-1), Fe (10, 50, 100 and 150 µmol L-1) and Mn (10, 50, 100 and 150 µmol L-1), equivalent in all cases to 0.1, 0.5, 1.0 and 1.5 times the normal concentration of the solution Hoagland & Arnon, respectively. The SPAD index had a better correlation with chlorophyll a than with clorophyll b. The SPAD indexes were positively correlated to N leaf content and negatively correlated to S. Leaf contents of Fe and Mn did not correlate to SPAD index

Uso do SPAD-502 na avaliação dos teores foliares de clorofila, nitrogênio, enxofre, ferro e manganês do algodoeiro herbáceo