Improved fertilizer effect of nitrogen - trials in winter wheat 020406080100 Cattle slurry Pig slurry Digested slurry N-utilization, % (fertilizer.

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Improved fertilizer effect of nitrogen - trials in winter wheat Cattle slurry Pig slurry Digested slurry N-utilization, % (fertilizer equivalent)

Utilization of nitrogen in solid fraction Spring barley, applied spring Winter wheat, applied autumn Winter wheat, applied spring 100 N-utilization, % (fertilizer equivalent)

Utilization of nitrogen in liquid fraction, spring application Spring barley, injected Spring barley, trailing hoses Winter wheat, injected Winter wheat, trailing hoses N-utilization, % (fertilizer equivalent)

Cattle slurry to spring barley, 9 trials, Yield, hkg grain per ha No nitrogen Trailing hoses + harrowed Injected before plowing Injected after plowing 34,4 43,2 47,7 47,2

Pig slurry to winter wheat, 11 trials, N kg NH 4 -N per ha Yield, hkg grain per ha Damage, hkg per ha Excl. damage Incl. damage Trailing hoses72,169,22,9 Injection74,869,05,8

Cattle slurry to grass for silage, 6 trials, kg NH 4 -N per ha Yield, cut, feeding units per ha Damage, hkg per ha Excl. damage Incl. damage Trailing hoses37,437,00,5 Injection38,238,10,1

Net economy for injection compared to trailing hoses

Danish recommendations on injection: Spring sown crops ………..…. Grass …………………………. Winter cereal ………….………