Jealott's Hill with seven perennial ryegrass varieties to study their response to nitrogen in terms of dry matter (DM) and crude protein (CP) yields.
AbstractThe dry matter and crude protein production of the perennial ryegrass varieties S24, S23, Premo, Houba, Barlenna, Melle and Sceempter Pasture at annual nitrogen application rates of 212,425, 637 and 1062 kg ha"' were studied for the years 1972-74 inclusive. The DM and CP response curves for the variety Melle were steeper than those for other varieties tested and levelled off at a higher N application rate. The results suggest that Melle is a variety with a genotype capahle of utilizing N more efficiently at higher rates than the other varieties tested.
In two trials conducted during 1971 the effects on total and seasonal production of grass dry matter and the crops' nitrogen recovery from a single spring application of a sulphur-coated urea or urea formaldehyde were compared with an equal amount of nitrogen applied in five dressings of urea or ammonium nitrate.Ammonium nitrate gave higher dry matter yields and nitrogen recovery than urea. Sulphur-coated urea as a single application gave results similar or superior to split applications of ammonium nitrate, but seasonal distribution of these were slightly different. Urea formaldehyde proved inferior, in the parameters measured, to the other fertilisers.
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