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In this work are described results of field trials in years 2006 and 2007. In these small plot trials we observed an influence of different selenium levels (control; 12, 24, 48 and 72 kg Se.ha^-1 to the soil; 200 and 400 g Se.ha^-1 foliar application) on development of leaf area index during vegetation (approx. 60, 67 and 75^th day after planting), hectare yield of tubers and on concentration of selenium in tubers.
We found out, that development of leaf area index was significantly affected by year, variety and also by dose of applied selenium. The highest value of LAI was reached by control variant and the lowest value of LAI was reached by variants, in which we applied 48 and 72 kg Se.ha^-1.
Also hectare yield was significantly affected by year, variety and selenium treatment. With increasing dose of selenium hectare yield decreased. Higher decrease we observed in variants with soil application of selenium.
Concentration of selenium in fresh tubers increased with increasing dose of this nutrient. The highest concentration was observed in variants, where we applied selenium to the soil before planting. Substantial increase of Se-concentration (2,5-3,5× more than control variant) was observed also in variants with foliar application of selenium.

The effect of Difert (a pig manure fermented by caddices of domestic flies produced on sawdust litter) on broccoli yield parameters and selected soil parameters were investigated on gleic fluvisol in a small-plot field trial localized at area of Slovak University of Agriculture in Nitra (48°18' N, 18°05' E).
The results showed that Difert applied in doses of 250 kg N.ha^-1 and 350 kg N.ha^-1 acted positively on the yields of fresh primary broccoli roses. However, the results are not statistically significant. Also a positive effect on N, P, K, Ca, Mg contents in broccoli roses was recorded. Difert has a moderate alkalizing effect on soil and increases the content of C_ox in the soil. Moreover Difert insignificantly decreased the content of vitamin C and significantly increased the content of nitrates in broccoli roses, but the worst qualitative effect on broccoli parameters was detected by applying mineral N fertilizers, which significantly increased the content of nitrates in broccoli roses and insignificantly decreased the vitamin C content. However, it resulted in the highest broccoli yields. The application of mineral N fertilizers had a negative effect on the total content of carbon in the soil as well.
The effect of Difert on broccoli yield and soil parameters refers to the feasibility of reducing the maturing period of the manure from 6 months to 1 week, in order to decrease the manure storage capacities.

The effect of dried organic and organomineral fertilizers on the yield and quality of the bush processing tomatoes variety 'Proton' were explored in 2005-2006. Field experimental plots were established in Žabčice in the Czech Republic. The following variants of fertilizers were included: Agormin T, Agro, Dvorecký agroferm, farmyard manure, mineral fertilizers and unfertilized control. All plots, except the control, were fertilized with mineral fertilizers on the same nutrients level. Total yield, marketable yield, number of fruits and mean fruit weight were assessed. Total solids, carotenoids, ascorbic acid and nitrates (mg.kg^-1 of fresh fruit weight) were analysed in fruits. Fertilizers did not significantly influence total yield and marketable yield. The highest yields were found at Agormin T (7.42 kg.m^-2 and 6.73 kg.m^-2, respectively), the highest mean fruit weight was found at mineral fertilizers (82.9 g) and Agormin T (82.4 g). Fertilizing with Agro resulted in the highest number of fruits (81.0 pieces.m^-2). Dvorecký agroferm significantly increased ascorbic acid content in fruits compared to the control. The highest nitrates content was recorded for the control, the lowest for mineral fertilizers. There was not found significant effect of fertilizers on total solids and carotenoids. All tested dried organic or organomineral fertilizers were shown to be efficient alternatives to traditional farmyard manure. Only Agro significantly decreased ascorbic acid content in comparison to farmyard manure.