Effect of cutting pattern and fertilization level on species diversity and evaluation of grassland quality

Abstract

The eff ects of fertilization level and cutting pattern on the species diversity and quality of a meadow stand were assessed in 2004-2012 in the small plot trial established in 2003 in Vatin, Vysočina Region, Czech Republic. Four levels of fertilization (none; N0 + P30 + K60 kgha-1; N90 + P30 + K60 kgha-1; N180 + P30 + K60 kgha-1) were combined with four treatments of exploitation intensity (4 cuts per year, first cut on 15th May, every next after 45 days; 3 cuts per year, first cut on 30th May, every next after 60 days; 2 cuts per year, first cut on 15th June, next after 90 days; 2 cuts per year, first cut on 30th June, next after 90 days). Numbers of species, Simpson's diversity index and evaluation of grassland quality according to Novak (2004) were evaluated. Numbers of species and Simpson's diversity index were significantly aff ected by both fertilization level and cutting pattern. Species richness decreased along with increasing fertilization rates from 29.4 (no fertilization) to 27.8 (N180PK). When comparing cutting pattern treatments the highest species richness was found in four-cut swards (29.6 in average of fertilization levels) and it declines towards late double-cut regime (27.2). The Simpson's index generally increased from two-cut swards to four-cut and from fertilized treatments to control. Grassland quality was significantly aff ected by cutting pattern. Values increased from four-cut swards (38.1) to two-cut ones (43.8 and 44.0 in early and late harvest respectively).