{{cite journal | last1=Zhao | first1=Y. X. | author2=X. M. Mao | author3=X. B. Zhou | year=2018 | title=EFFECT OF PREVIOUS CROP NITROGEN APPLICATION ON YIELD OF FOLLOWING MAIZE UNDER DIFFERENT PLANTING PATTERNS | journal=Journal of Animal and Plant Sciences | volume=28 | issue=5 | pages=1441-1446 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2018-JAPS-526}}