Nitrogen (N) plays a key role in the plant life cycle. It is the main plant mineral nutrient
needed for chlorophyll production and other plant cell components (proteins, nucleic acids …

Nitrogen (N) is significantly related to crop photosynthetic capacity. Over-and-under-
application of N fertilizers not only limits crop productivity but also leads to negative …

Alfalfa is a valuable and intensively produced forage crop in the United States, and the
timely estimation of its yield can inform precision management decisions. However …

Hyperspectral data (Table 1) is acquired as continuous narrowbands (eg, each band with 1
to 10 nanometer or nm bandwidths) over a range of electromagnetic spectrum (eg, 400 …

Leaf and canopy nitrogen (N) status relates strongly to leaf and canopy chlorophyll (Chl)
content. Remote sensing is a tool that has the potential to assess N content at leaf, plant …

With advances in satellite, airborne and ground based remote sensing, reflectance data are
increasingly being used in agriculture. This paper reviews various remote sensing methods …

Rapid and accurate monitoring of crop plant height (PH), canopy coverage (CC), and leaf
nitrogen concentration (LNC) is essential for precision management of irrigation and …

To reduce environment pollution from cropping activities, a reliable indicator of crop N status
is needed for site-specific N management in agricultural fields. Nitrogen Nutrition Index …

Timely assessment of canopy nitrogen content (CNC) in crops is critical for growth diagnosis
and precision management of crops to generate higher yield and better quality while also …

Novel hyperspectral indices, which are the first derivative normalized difference nitrogen
index (FD-NDNI) and the first derivative ratio nitrogen vegetation index (FD-SRNI), were …