Net photosynthesis and spectral reflectance over rice crop under different nitrogen treatments in semi-arid region of IndiaPantnagar Journal of Research, Volume - 19, Issue - 2 ( May-August, 2021)
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The primary production of an ecosystem is primarily dependent upon net photosynthesis (Pn). Furthermore, rapid and non-destructive techniques for the assessment of Pn are needed to monitor the plant growth and development. Hence, we evaluated the hyperspectral measurements to estimate the Pn under different nitrogen treatments in rice crop. Other variables like photosynthetically active radiation (PAR) and chlorophyll content index (CCI) were also measured simultaneously at three different growth stages of rice. Vegetation index (VI) was calculated using the hyperspectral measurements to develop a model based on VI, PAR, and CCI to estimate Pn. The response of Pn to the normalized difference vegetation index developed at 700nm (NDVI700) was found better in comparison to the other VIs. Furthermore, the model with CCI x NDVI x PAR (R2 = 0.77) was found best among all the models tested to estimate the net photosynthesis.
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