Chlorophyll contents in tomato cultivars under magnesium foliar applications

• Main Authors: Átila Francisco Mógor, Thamiris Barbizan, Volnei Pauletti, Juliana de Oliveira, Marcelle Michelotti Bettoni
• Format: Article
• Language: English
• Published: Universidade Federal de Goiás 2013-12-01
• Series: Pesquisa Agropecuária Tropical
• Subjects: Solanum lycopersicum L.; magnesium hydroxide; magnesium chloride; portable chlorophyll-meter
• Online Access: https://www.revistas.ufg.br/pat/article/view/20592

Although the foliar nutrients application is well disseminated in horticulture, the technology is still controversial, since the products efficiency is related to the characteristics of the formulations, especially the sources of nutrients used. Thus, this study aimed at identifying changes in chlorophyll contents, by using the colorimetric method and a chlorophyll meter, as well as in the Mg content in tomato plant leaves, as related to foliar applications of solutions containing Mg (OH)2 or MgCl2. Two tomato cultivars were subjected to fertigation with low Mg addition. The data from the chlorophyll meter were corroborated by the colorimetric method, indicating that the solutions containing 1.0 mL L-1 and 2.0 mL L-1 of a suspension concentrate (300 g L-1 of Mg, as Mg(OH)2) and the solution containing 3.75 mL L-1 of MgCl2 were effective in increasing the chlorophyll contents, resulting in the Mg absorption and metabolization. The solution containing 7.5 mL L-1 of MgCl2 caused fitotoxicity and reduced the chlorophyll contents, although promoting a higher Mg content in leaves.