Estimation of Chlorophyll and Nitrogen Levels in Aromatic Coconut Leaves by Chlorophyll Meter
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Abstract
Estimation of chlorophyll and nitrogen levels in aromatic coconut leaves by chlorophyll meter (Minolta SPAD-502), extracting nitrogen concentrate in leaves, and the absorption range of chlorophyll obtained from UV-VIS spectrophotometer were performed in this research. A relationship between the amount of chlorophyll in the leaves, green leaf value, and the concentration of nitrogen in the leaves was established. The experiment was conducted at a farmer field in Ko-Taeo subdistrict, Mueang district, Songkhla province, by randomized complete block design with 5 replications. There are 4 treatments providing different Long Ashton nutrient solution nutrients with different nitrogen levels. It was found that the dynamic values of the leaf greenness index measured from the SPAD chlorophyll meter reading (SCMR), the concentration of leaf nitrogen and the absorption range of chlorophyll, are associated with the development of the leaf phase. It shows that the ages and the location of the leaves are related to the greenness and nitrogen content. In addition, it was found that the leaf greenness values increased significantly in accordance with the rate of nutrient solution with increased nitrogen. The results showed a linear relationship between leaf greenness index, nitrogen concentration and chlorophyll content. The results indicated that leaf greenness could be used as an indicator for evaluating the concentration of nitrogen and chlorophyll in the leaves. Therefore, this research can guide farmers to manage the suitable nutrient solution in aromatic coconuts.
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