Organic and clay-based soil amendments increase maize yield, total nutrient uptake, and soil properties in Lao PDR - Mekuria, Wolde; Noble, A.D.; Sengtaheuanghoung, Oloth; Hoanh, Chu Thai; Bossio, Deborah A.; Sipaseuth, Nivong; McCartney, Matthew P.; Lagan, Simon (Informa UK Limited, 2014)