Moro, E. et al. 2013. Soil acidity as affecting micronutrients concentration, nitrato reductase enzyme activity and yield in upland rice plants. Semina: Ciências Agrárias. 34, 6Supl1 (Dec. 2013), 3397–3410. DOI:https://doi.org/10.5433/1679-0359.2013v34n6Supl1p3397.