Effect of split applications of nitrogen, potassium fertilizer and irrigation on the yield and quality of grass and grass-legume mixtures in the East Slovakian lowlands

Hrezo, F.

Vedecke Prace Vyskumneho Ustavu Zavlahoveho Hospodarstva v Bratislava 21: 25-40

1994


Accession: 002604849

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Abstract
In field trials on reclaimed alluvial soils in 1988-1989, a grass/legume mixture of Lolium perenne, Dactylis glomerata, L. multiflorum, Alopecurus pratensis and Trifolium repens was compared with a grass mixture of L. perenne, Poa pratensis, Festuca pratensis, F. rubra, Phleum pratense and A. pratensis. The swards were cut 4 times/year and were given 0-450 kg N/ha in 5 doses and 44 kg P and 103 kg K/ha at all N rates except the highest where the P and K rates were doubled. Irrigation was given to 70% of soil water capacity or was withheld. Hay yields were increased by the combination of irrigation and N application more than just with N alone, reaching a max. of 24.1 t in 1989 at the highest N rate + irrigation, but application of >250 kg N increased the likelihood of grass tetany without generally increasing average yields (15.4-16.3 t with irrigation).