Changes in some biological properties of soil under semi-natural grassland under different long-term management
1995
Ondrasek, L. (Vyskumny Ustav Travnych Porastov a Horskeho Polnohospodarstva, Banska Bystrica (Slovakia))
Development of some biological properties of soil under semi-natural grassland (Anthoxantho-agrostietum) was assessed in sward under intensive management (between 1976-1987) and after the management was terminated (1988-1990). The trial was established at the site of Suchy vrch (5 km from Banska Bystrica, Slovakia) on acid brown soil at an altitude of 685 m. The sward was utilized in 3-cut and 5-cut systems at 4 levels of mineral nutrition (0 - 50 - 150 - 300 kg N.ha** (-1)). Results from microbiological laboratory tests (total mineralization of nitrogen (N), basal nitrification, potential ammonification, respirometric test) and those obtained under field conditions (C02 production) were used to study changes in biological properties of soil. As indicated by total mineralization data, the highest N rates markedly stimulated mineralization processes in soil, especially at 3-cut utilization in the first years, causing a notable decrease in soil organic matter. In the following years, the stimulating effect of the applied N disappeared and after 1981, as determined by CO2 production, there was an unambiguous decrease in mineralization with increasing N rates. At the same time organic matter content, stability and quality increased. On the basis of the respirometric test especially, a general decrease in intensity of mineralization in soil and an increase in content and stability of soil organic matter were discovered after the sward management was concluded.
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