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| | | Article Name : | | | Effects of fertilization, temperature and leaf collection points on chlorophyll content in adult individuals of Tectona grandis L.f. | | Author Name : | | | Mateus Souza da Silva, Genilson Maia Corrêa, Jones de Castro Soares, Henderson Duarte dos Santos, Adriele Alvez Luz, Taissa Nery Ferreira, Henriqueta da Conceição Brito Nunes, Luiz Fernandes Silva Dionisio | | Publisher : | | | Bridge Center | | Article URL : |  | | | Abstract : | | | The aim of the present study was to determine and compare chlorophyll concentrations in adult individuals of Tectona grandis in two plantations in the municipality of Irituia-PA. A completely randomized design was used, with two treatments (T1 = planting without fertilization and T2 = planting with fertilization) where 50 adults individuals of T. grandis were randomly chosen, being 25 trees per planting area. After collection, the chlorophyll content was obtained from 10 different points on the leaf using an atLEAF+ chlorophyll meter, in addition to measuring climatic data of temperature and humidity. Finally, the chlorophyll contents of generic units generated by the equipment were converted to mg/cm2. The highest measured chlorophyll contents were attributed to the T2 area, which receives constant fertilization, proving the existence of the relationship between the pigment and the disposition of nutrients in the soil. Regarding the levels of chlorophyll by leaf measurement points, the values corresponding to points 1, 2, 3 and 4 were statistically higher than the others, showing that there is greater pigment production in the lower part of the leaf blade. As for the measurement times, a relationship was directly proportional to the chlorophyll contents, in conjunction with temperature. Therefore, based on the rise of chlorophyll levels, there was no photo-oxidation of the pigments during the observed period. | | Keywords : | | | Forest plantations, teak, chlorophyll meter, photosynthesis |
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