Decreases over seven years in subsoil nitrate in a vertisol with grain sorghum and grass

Subsoil chemical properties and root distributions were measured over seven years under annual grain sorghum (Sorghum bicolor) cropping with crop residue retention and zero tillage and under perennial Rhodes grass (Chloris gayana). The site, in the semi-arid subtropics of eastern central Queensland,...

Ausführliche Beschreibung