|
|
Redukcia organických látok v sedimentoch za využitia bakteriálne - enzymatických zmesí
Voltemar, Erik
Accumulation of sediments in fishponds is a serious problem for today's aquaculture. High economical, organizational and time-consuming requirements are often the limit factor for many fish farmers. One of the available solutions has recently emerged bacterial-enzymatic mixtures, which thanks to modified bacteria cultures, have been able to reduce organic matter from sediment and improve overall physical and chemical water parameters. The aim of this diploma thesis was to verify the effect of the bacterial - enzymatic mixture PTP plus in laboratory and field conditions. For the laboratory experiment, was chosen a method with different concentrations of the PTP plus, under the controlled conditions of the glass containers. However, the results of the laboratory test did not confirmed significant effect of this bioenzymatic mixture on the reduction of the organic component of the sediment nor on the changes in the physical and chemical parameters of the water. But the influence at the visual properties of the water was confirmed in container with several times higher dose. Three small ponds near Bohuslavice near Konice, with a total area of approximately 2.5 hectares were chosen for the field experiment. The results of the field experiment also did not confirm the significant effect of the bio-enzymatic blend on the physical and chemical parameters of the water in the monitored localities. However, in the lowest location of the fishpond cascade, BOH I, was recorded slight reduction of sediment organic component.
|
|
|
Forms of phosphorus in soils basin acidified mountain lakes
ČISLAKOVÁ, Patricie
The thesis focuses on the availability of phosphorus in soils basin acidified lakes in Šumava by Mehlich III extraction method. Compares the measured results of soil samples, collected in 2010 from the watersheds of Čertovo and Plešné Lake and evaluates the suitability of this extraction method for the determination of phosphorus availability in acidified forest soils.
|
|
|
Možnosti využití metody Mehlich III k posouzení obsahu přístupné síry v půdě
Ruška, David
The aim of this paper was to evaluate if accessible sulphur analyses in soil are relevant for Agrochemical Soil Testing (AZZP). This issue was assessed in the years 2014/2015. Samples to be taken in 2015 were selected according to results on sulphur analyses in Mehlich III extraction agent in 2014. It means that the first sampling was carried on in the autumn 2014 and second in the spring 2015. Plans were sampled together with soil in 2015. Seven regions were included in the sampling scheme (Brno, Planá (České Budějovice), Plzeň, Opava, Havlíčkův Brod, Liberec and Prague) and plots with winter wheat and winter rape were sampled. Majority (78 %) of soils samples measured on accessible sulphur content falls into the range 10,1 - 20,0 mg.kg-1. Average contents of accessible sulphur in soils in the autumn and spring were almost identical and there are no statistical differences amongst regions. Influence of fertilising on sulphur content in soils was not confirmed, however, sulphur fertilization positively influences the sulphur content both in rape and wheat plants. The content of accessible sulphur in soils in the spring positively correlates with sulphur content in rape. Based on current nutrient normative, 59 % of wheat plants are below the value when yield decrease may occur. In the case of rape it is more than 90 % of plants (samples). It does not seem to be suitable to include accessible sulphur measurement in soils into the AZZP system. The six-year cycle of AZZP is rather too long if soil sulphur mobility and dynamics is taken into account.
|
guest ::
