Studies on the effect of nitrogen fertilizer application and clean-water sprinkler irrigation on DM yield and on distribution of forage production of several grass species in relation to date of use of first growth

Lampeter, W.; Matthies, H.; Tchaptchet, A.

Archiv für Acker- und Pflanzenbau und Bodenkunde 17(5): 353-362


ISSN/ISBN: 0365-0340
Accession: 000206909

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Italian ryegrass, perennial ryegrass, meadow fescue and cocksfoot were given 100-400 kg N/ha without irrigation or 150-600 kg N/ha with irrigation and were cut before shooting, during shooting, or after inflorescence formation but before flowering. DM yields increased with increasing N under both conditions and with delay in 1st cut. Italian ryegrass produced the highest yields and best fodder quality, but even with adequate water supply yields decreased at high temperatures. With up to 300 kg N/ha, Italian ryegrass produced 10-20 kg DM/kg N, whereas DM yield increased only 5.5 kg/mm of additional irrigation. Cocksfoot showed no yield decrease at high temperatures and persisted better under dry conditions than the other species. Productivity of cocksfoot was 10-24 kg DM/kg N up to 300 kg N/ha and 6.4 kg DM/mm irrigation. At the lower and intermediate N levels (100 to 300 kg/ha), dry-matter responses by Lolium multiflorum, L. perenne, Festuca pratensis and Dactylis glomerata were 10-20, 8-24, 0-16 and 9-24 kg DM/kg N. Corresponding responses to irrigation in the presence of 300 kg N/ha were 5.5, 7.5, 10.8 and 6.4 kg DM/mm water. L. multiflorum gave the highest yields and best forage quality, but production was restricted by high temperatures. Dactylis glomerata, however, was little effected by high temperatures and dry conditions.