TY - JA AU - Khalifa,M.A TI - Effects of sowing date, nitrogen and seed rate on wheat yields in the sudan Gezira SN - 1469-4441 PY - 1970/// N1 - Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0014-4797 T2 - Experimental Agriculture ER -