Recommended application rate of nitrogen fertilizer for penennial ryegrass (Lolium perenne L.) monoculture meadow in Tenpoku region of Hokkaido
2007
Okamoto, H.(Hokkaido. Tenpoku Agricultural Experiment Station, Hamatonbetsu (Japan)) | Okumura, M. | Furudate, A.
The optimal nitrogen fertilizer rate for perennial ryegrass (Lolium perenne L., cv. Pokoro) meadows cut three times a year in Tenpoku Region, Hokkaido, was determined in a field experiment applying five nitrogen rates (90, 160, 180, 210 and 240 kg/ha/year). Herbage DM yield increased as the nitrogen rate increased, with a non-significant difference between the two highest rates. Nitrogen use efficiency was higher at higher nitrogen rates, but the increase in DM yield per unit nitrogen applied peaked at 160-210kg/ha. With the increasing nitrogen rates, in vitro dry-matter digestibility and water-soluble carbohydrate content of herbage decreased, while fiber and crude protein contents increased. The results show that the annual nitrogen rate of 210kg/ha is most suitable for cutting use of perennial. ryegrass meadows in the region.
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