Diagnosis tool for plant and crop N status in vegetative stage Theory and practices for crop N management

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New Critical Nitrogen Curve Based on Leaf Area Index for Winter Wheat (2014, background): “Although Nc curves for C3 crops have been based on the aboveground DM, an alternative and functional approach to assessing N demand involves examining leaf area expansion because aboveground DM accumulation and leaf area expansion are affected by the same N regulatory process during plant growth (Le”
The future of grain legumes in cropping systems (2012, methodology): “These relationships are based on the empirical relationships found by Lemaire et al. (2008).”
Estimating Biomass of Barley Using Crop Surface Models (CSMs) Derived from UAV-Based RGB Imaging (2014, methodology): “The relationship between biomass and N concentration is used in the N dilution curve, from which the critical N content is derived [9,10].”
Measuring and predicting canopy nitrogen nutrition in wheat using a spectral index—The canopy chlorophyll content index (CCCI) (2010, methodology): “The NNI can also be used to determine crop N status once relationships between NNI and crop N are established (Lemaire et al., 2008) and a critical N status value is determined through empirical means (Justes et al.”