Muturi, Jamleck; Kristin, Piikki; Mats, Söderström; Eriksson, Jan; Muthee, Patrick I.; Wetterlind, Johanna; Lund, Eric (MDPI, 2016)
Four proximal soil sensors were tested at four smallholder farms in Embu County, Kenya:
a portable X-ray fluorescence sensor (PXRF), a mobile phone application for soil color determination
by photography, a dual-depth ...