Transactions of the ASABE · 2007 · 56 citations · 16 references
AgricultureAgronomyPlant SciencesNutrient ManagementPlant EcologyRemote SensingPhotosynthesis In CropsRemote Sensing For Crop ManagementRemote Sensing For Yield EstimationVegetation Cover AssessmentVegetation IndicesVegetation MonitoringChlorophyll ConcentrationChlorophyll Content MeasurementCrop Biomass EstimationMonitoring Plant Nutrient StatusNitrogen Fertilizer ManagementPercent Vegetation CoverPlant Nitrogen Status EstimationRemote Sensing-based Yield Estimation
The presence of nitrogen in soil and chlorophyll in plants are directly related; thus, chlorophyll may be used as an indirect indicator of nitrogen levels in fertilizer management systems. This research investigated a non-destructive method of determining chlorophyll content and concentration in field-grown spinach. Biomass was estimated with percent vegetation coverage based on images taken with a multispectral imaging system. Chlorophyll yield was estimated using reflectance-based NDVI from a GreenSeekerTM hand-held optical sensor and a multispectral imaging system. Strong correlations were found between reflectance-based NDVI and chlorophyll yield (R2 = 0.92), between NDVI and biomass (R2 = 0.94), and between biomass and projected plant area (R2 = 0.96). Combined parameter estimators of chlorophyll concentration had low correlation.
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