Influence of the NPK – Fertilization Terms of Grass-Legume Mixture in Upland Region

V. LINGORSKI
Institute of Upland Stockbreeding and Agriculture, BG-5600 Troyan, Bulgaria

Abstract

LINGORSKI, V., 2001. Influence of the NPK – fertilization terms of grass-legume mixture in upland region. Bulg. J. Agric. Sci., 7: 623-626

The using effect of different rates and of NPK-fertilization on dry matter productivity and botanical composition of grass-legume mixture: birdsfoot trefoil (Lotus corniculatus) + white clover (Trifolium repens) + red clover (Trifolium pratense) + orchard grass (Dactylis glomerata) + timothy (Phleum pratense) + red fescue (Festuca rubra) during the period 1994 – 1997 in an upland region of Central Northern Bulgaria, was studied.
Mean for the investigation period the most dry matter production (8.76 t.ha–1) was obtained by annually N80P80K80-application – with 16.6 % more than the infertilized variant (as a standard).
The optimum botanical composition of grass-legume mixture (and minimum weed infestation) had by same fertilization mode, however was reached the grass species components to 93.3% in the last (fourth) year of investigation.

Key words: NPK-application, grass-legume mixture, dry matter, botanical composition