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Results and conclusions from numerous trials comparing sources of nitrogen for cereal crops give a guide to choice of fertiliser and the time and method of application.
Mason, M G.
"Sources of nitrogen for cereals : urea, ammonium nitrate or sulphate of ammonia?,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 18
, Article 6.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol18/iss1/6