Estimating Swiss chard foliar macro- and micronutrient concentrations under different irrigation water sources using ground-based hyperspectral data and four partial least squares (PLS)-based (PLS1, PLS2, SPLS1 and SPLS2) regression algorithms. - Elfatih M. Abdel-Rahman; Onisimo Mutanga; John Odindi; Elhadi Adam; Alfred Odindo; Riyad Ismail (Comput. Electron. Agric., 2017)