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Vliv odstupňovaných dávek dusíku na druhovou skladbu polopřirozeného travního porostu
Šromová, Kristýna
ABSTRACT This diploma thesis is valuating an influence of a nitrogen fertilization on species structure of a semi-natural grassland. Experimental site is located 650 m in the Bohemian-Moravian Highlands in locality of Kameničky. From 2012-2013 four variants of fertilization has been compared (unfertilised, fertilized 45 kg.ha-1 N + PK, fertilized 90 kg.ha-1 N + PK, fertilized 135 kg.ha-1 N + PK and fertilised 180 kg.ha-1 N + PK) and two variants of fertilizers (two-edged and triple-edged). Additionally, I am dealing in detail with outproductive functions of permanent grassland and analysis of individual plant species represented at the observed site. All the obtained results show, that species diversity decreases with fertilizers, which on the contrary increases production of fodder. Fertilising with N increases (P<0,05) proportion of cultural grasses, but simultaneously decreases (P<0,05) proportion of herbs and clovers. Regarding intensity of utilising, fertilisers triple-edged were more species diverse, a diversity index confirms this fact.
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Influence of fertilization and frequency of mowing on the stand composition, production and forage quality of grass stand
SMRŽ, Jan
The long-term small plot trial was established at the site in Jevíčko in 2003. Monitoring was realised in years 2006 and 2007. There were used four levels of utilisation (four, three, two and two cuts) and four fertilizer application (zero fertiliser, PK, N90PK, N180PK). The average dry matter production of grassland was 6.99 t ha-1, and it was significantly (P 0.01) reduced when subjected to four and three cut systems compared with a two-cut system. The number of botanical species fluctuated between 17.8 and 27.6. The intensive cutting system significantly (P 0.01) increased CP concentration (from 116.6 to 149.8 g kg-1 DM), CP production (from 787.4 to 951.1 kg ha-1), NEL concentration (from 5.09 to 5.57 MJ kg-1 DM), NEV concentration (from 4.81 to 5.41 MJ kg-1 DM), PDIE concentration (from 75.1 to 83.3 MJ kg-1 DM), and PDIN concentration (from 68.9 to 89.2 MJ kg-1 DM) when compared with the extensive cutting system. The intensive system significantly (P 0.01) decreased the fibre concentration from 292.2 to 234.2 g kg-1 DM. Increasing N fertiliser significantly (P 0.01) increased DM production (from 4.77 to 9.92 t ha-1), CP concentration (from 123.4 to 140.9 g kg-1 DM), CP production (from 545.7 to 1285.4 kg ha-1) and the PDIN concentration (from 68.5 to 83.8 g kg-1 DM) when compared to the control treatment (zero fertiliser).
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