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Identifikace negativních vlivů působících na přírodní památku Pahorek
Sklenka, Marek
Small natural sights in agricultural landscapes are threatened by a number of factors. To protect them you need to identify negative factors that influence them. Natural Monument Hill in the cadastral Bindings Vyškova is used as extensive pasture protected because of rare species of thermophilic plants. The area measurements were taken basal soil respiration, soil organic matter content in the soil by burning a number of moving forms of nitrogen in the soil. Contamination of the nitrogen from external sources has not been established, there have been differences in the content of organic matter in the soil, caused by the truth, like the management of the territory. Measurement of basal respiration showed dependency on the content of water in the soil during the vegetation period. The result of survey sites and outputs from laboratory measurements should be advised to head better care settings management of protected areas and improve its condition.
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Hodnocení pěstebních substrátů a jejich vlivu na produkci a kvalitu zeleniny
Kršková, Tereza
The aim of the presented work is to assess the influence of commercially available substrates in the production of lettuce and to recommend the use of selected products not only in agricultural practice but also in the professional public. The essence of the experimental part was the laboratory testing of selected substrates and their subsequent selection pot trials, where their effect on lettuce production was monitored on its yield and production quality. The substrates were selected on the basis of the results from the laboratory testing in two Hobby (Horticultural substrate with humus, tomato and pepper substrate) and two Profi (Profimix RS1, Profimix RS2). For cultivation, they were used in a soil-mixed mix. Application of substrates had a significant effect on salad yield. Profi substrates contributed to the increase in fresh salad mass. Mixed with soil, production increase was more than doubled, the salad yield increased almost 2.5 times when used alone. The efficiency of the Hobby substrate application was less known, the yield increased by 44% on average due to their use. The average nitrate content in the experiment was 1188 mg / kg. Application of Profi substrates increased its content in the range of 159-774 mg / kg, compared to the inconclusive control. Nitrate in lettuce grown in Hobby substrates significantly increased the nitrate content in vegetables. When the substrate for tomatoes and peppers was used, the limit of Regulation (EC) No 1881/2006 was exceeded. Keywords: substrates, lettuce, yield, nitrates.
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Identifikace negativních vlivů působících na přírodní památku Pahorek
Sklenka, Marek
Small natural sights in agricultural landscapes are threatened by a number of factors. To protect them you need to identify negative factors that influence them. Natural Monument Hill in the cadastral Bindings Vyškova is used as extensive pasture protected because of rare species of thermophilic plants. The area measurements were taken basal soil respiration, soil organic matter content in the soil by burning a number of moving forms of nitrogen in the soil. Contamination of the nitrogen from external sources has not been established, there have been differences in the content of organic matter in the soil, caused by the truth, like the management of the territory. Measurement of basal respiration showed dependency on the content of water in the soil during the vegetation period. The result of survey sites and outputs from laboratory measurements should be advised to head better care settings management of protected areas and improve its condition.
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Monitoring of nitrates content in vegetables from Plzeň city market net
BENEDÍKOVÁ, Petra
The nitrates content in 12various sorts of vegetables and potatoes was measured in years 2005 - 2007 using nitrate ion selective electrode. From total number 539 of analyzed samples 72 samples exceeded the maximal limit concentration of nitrates. Most frequently non-permissible values were found in the kohlrabi (26 samples from 44), radish (18 from 45), potatoes (8 from 48), root parsley (4 from 26), red beet (4 from 27) and white cabbage (6 from 45). Absolutely highest content of nitrates was measured in kohlrabi 4 610 mg NO3-.kg-1(in fresh matter) and red beet 4 977 mg NO3-.kg-1. Although over 13 % of samples exceeded limits of nitrates given by law, in generally, can be assumed that positive factors from vegetables consumption play more important role than potential risc from possible nitrates overdosage.
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