Precise estimation of leaf chlorophyll concentration (LChl) in the field using a portable chlorophyll meter (PCM) is essential to measure the total chlorophyll concentration and spatiotemporal variability of the plant’s nitrogen status using remote sensing. Conventional methods of detecting photosynthetic pigments entail lengthy solvent extraction operations followed by spectrophotometric analysis. Due to the speed and simplicity of the measurements, portable plant equipment such as Soil Plant Analysis Development (SPAD) meter can facilitate this process. The correlation between the SPAD-502 chlorophyll reading and pigment content in numerous important plant species and can assist in plant production management. We performed two tests in this paper, in the first test (3monocot and 3dicot) plant species collected from the university campus and in the second test (3 greenhouse and sample plant grown in outdoor condition) collected from the greenhouse and outdoor condition. There was a higher linear association between average chlorophyll concentrations studied in greenhouse species compare to the open field condition plants. In the second trial higher relationship was observed in monocot plant species in comparison to the other three groups of dicot plant species. SPAD chlorophyll meter is an efficient device to measure chlorophyll and other pigments instantly and precisely, to maintain the proper health of plants. Throughout the cropping season, chlorophyll meter are used to control fertilizer N to maintain a threshold leaf chlorophyll level. By lowering fertilizer N rates, chlorophyll meters can improve fertilizer N use efficiency to increase the crop yield for the farmers.

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