Urea, Nitrogen fertilizers, Application methods, Sowing, Seed germination, Burracoppin region (W.A.), York region (W.A.), Western Australia
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Trials in 1968 at Burracoppin and York again showed it is safer to topdress urea just before seeding than to drill a mixture of seed and urea.
At all but the lowest urea rates, urea drilled with the seed reduced the number of plants emerging and surviving, and reduced final wheat yields.
Mason, M G.; Loutit, A.; Smith, J. A. C.; Highman, D.; and Stallwood, P.
"Urea drilled with seed affects germination and yield,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 11
, Article 6.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol11/iss3/6