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Vliv odstupňovaných dávek živin a počtu sečí na druhovou skladbu a primární produkci polopřirozeného travního porostu
Kinc, Jaroslav
This diploma thesis deals with influence of fertilizing and usage intensity on species composition and primary production of semi-natural grassland. The issue was solved through an experiment at Kameničky stand, which is located at Bohemian-Moravian Highlands at an altitude of 650 m. In the experiment were evaluated variants of fertilizing: non-fertilized, fertilized P30+K60, fertilized N90+P30+K60 and fertilized N180+P30+K60 with a double-cutting and triple-cutting usage intensities in 2014 and 2015. The results showed, that nitrogen fertilizing promoted the development of grasses (P<0,05) and reduced the proportion of clovers and herbs (P<0,05) in the stand. Phosphorus and potassium fertilizing in the stand increased proportion of clovers at the expense of herbs. Beside 2015, conclusive higher proportion of clovers was in the stand in 2014 (P<0,05). Double-cutting intensity of usage promoted numbers of grasses and decreased numbers of clovers in the stand. Triple-cutting intensity of usage increased proportion of clovers in the stands, which were richer on species. Triple-cutting stands had higher Hill's diversity index, which was decreased with higher fertilizing intensity, same as number of species in the stand. Fertilizing conclusively increased yields of dry fodder (P<0,05). Double-cutting stands indicated higher yields of dry fodder (6,46 t.ha-1) than triple-cutting stands (5,96 t.ha-1). Beside 2015 (5,68 t.ha-1), higher yields of dry fodder (6,74 t.ha-1)were in 2014 (P<0,05).
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The influence of different way of grassland management on botanical composition and biomass production of grass stand
ŠOBROVÁ, Martina
This thesis summarizes the results obtained from a study of long-term field trials with permanent grassland, which based on Faculty of Agriculture, University of South Bohemia in the České Budějovice between years 2010 - 2013. Permanent grasslands are managed in different ways (mowing, mulching, fallow) and the intensity of exploitation (harvested 1 - 3 times a year, fertilization). The work was focused on the evaluation of changes in growth composition, biomass production and dry matter content of hay variants. Also were evaluated biodiversityand grazing value of the crop stand. Before each harvest (mowing or mulching) was evaluated growth composition of experimental grasslands on an area of 20 m2. Plant species coverage of individual agro botanical groups was estimated by the reduced projective dominance (% D). Harvested biomass of grassland was considered and sample mown every variantof the experiment was dried (dry matter content). Species diversity was expressed as the number of species and species diversity was expressed in the form of Simpson's index. It was also calculated value describing the quality and productivity ofthe crop stand.
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