An experiment comparing urea-formaldehyde fertilizer with ‘nitro-chalk’ for Italian ryegrass

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Abstract
1. Italian ryegrass was used in 1958 and in 1959 to compare ‘single’ spring dressings of urea-formaldehyde fertilizer (UF) with equivalent spring dressings of ‘Nitro-Chalk’ (NC), and with ‘repeated’ NC (divided equally between three cuttings). Barley measured residues in 1960.2. At the first cut each year, yields from UF and repeated NC were similar, but later NC gave much larger yields. Aggregate increases from UF were less than half those from equivalent NC.3. Both forma of nitrogen had residual value for grass and barley.4. Maximum recovery of N, over 3 years, was 54% for UF and 90% for equivalent NC. Single NC dressings were recovered more completely than repeated dressings.5. The maximum aggregate uptakes over 2 years by grass receiving 2·0 cwt. N/acre each year were 72 lb. P and 611 lb. K/acre.

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