Effect of ecological conditions and intensity of nitrogen fertilization on the NO3-N content of the dry matter of grass swards

Lichner, S.

Rostlinna Vyroba 23(5): 451-458

1977


ISSN/ISBN: 0370-663X
Accession: 000639657

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Abstract
In a field trial in 1970-4, natural grassland on N.- and S.-facing slopes at 300, 600 or 900 m alt. in the area of (a) Pohronsky Inovec with a moderately dry and warm climate and (b) Dobsina with a wet and cold climate was given 30 kg P + 100 kg K/ha and 120, 240 or 480 kg N/ha applied in 4 equal split dressings in spring and after each of the 1st 3 cuts, and was cut 4 times/yr. The NO3-N content of the herbage DM did not reach toxic levels in any case, was higher at (a) than at (b), decreased with increase in alt. and was indirectly correlated with the number of days from N application to cutting. At 300 m alt., contents were higher on N.-facing than on S.-facing slopes, but the difference was less at 600 m and disappeared at 900 m alt.