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Effect of ammonium nitrate and urea on the growth and nitrate nitrogen content of perennial ryegrass on a mineral soil


Effect of ammonium nitrate and urea on the growth and nitrate nitrogen content of perennial ryegrass on a mineral soil



Roczniki Nauk Rolniczych, A 99(2): 61-72



In field trials in 1970-1, perennial ryegrass was given 150, 300 or 450 kg N/ha as urea or ammonium nitrate applied in 3 equal split dressings during the growing season. At 450 kg N/ha the effect of urea was 5-10% less than that of ammonium nitrate. Plant NO3-N contents were higher in the 1st year than in the 2nd year due to poorer development and less sunshine.

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