{{cite journal | last1=Ng`ang`a | first1=P. K. | author2=K. M. Jezik | year=2014 | title=EFFECT OF SOIL ON UPTAKE AND UTILIZATION OF NITROGEN BY OAT (Avena sativa L.) | journal=Journal of Animal and Plant Sciences | volume=24 | issue=1 | pages=321-328 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2014-JAPS-45}}