AbstractČEKEY, N., ŠLOSÁR, M., UHER, A., BALOGH, Z., VALŠÍKOVÁ, M., LOŠÁK, T.: The eff ect of nitrogen and sulphur fertilization on the yield and content of sulforaphane and nitrates in caulifl ower. Acta univ. agric. et silvic. Mendel. Brun., 2011, LIX, No. 5, pp. 17-22 In the fi eld experiment with caulifl ower, we investigated the eff ect of four diff erent variants of nitrogen and suplhur fertilization on quantity and quality of caulifl ower in the term of sulforaphane content and nitrate accumulation. The infl uence of fertilization was statistically signifi cant between control variant and fertilization variants and in both experimental years within all parameters of caulifl ower yield. The highest yield of caulifl ower was reached at the variant 4 when it was fertilized on the level of nutrients N:S = 250:60 kg.ha −1. The increase of yield against control variant represented value 26.6%. The applied fertilization positively aff ected on the accumulation sulforaphane in the caulifl ower. Its highest content was determined at the variant 4 (N:S = 250:60 kg.ha −1 ). In comparison with control variant, the sulforaphane content was increased about 18.4%. On the other side, applied nutrition resulted in increased accumulation of nitrates in the caulifl ower. The most increase of nitrate content, compared to the control variant, was also ascertained at the variant 4 (about 31.4%). The gathered data point towards to the possibility and way how we could eff ect on the increased accumulation of sulforaphane in caulifl ower fl orets. This sphere of fertilization eff ect on the sulforaphane content is not suffi ciently explored well. Our aim is to continue in this research subject and to fi nd way how to cultivate vegetables with higher content of health-promoting compounds.
Cauliflower (Brassica oleracea var botrytis) as a member of the family Brassicaceae belongs to worldwide popular vegetable with using in all kinds of cuisine. The aim of the work was to find out the effects of nutrition and fertilization (in dependence on the amount of nitrogen) on the yield of florets as well as on selected qualitative characteristics - vitamin C, nitrate and sulforaphane content. Analyses were done by the help of liquid chromatograph (HPLC) with UV detector for separation. The trial was led in Nitra, Slovakia, in 2014 - 2015. Cauliflower variety CHARLOT F1 was selected for testing. Four variants have been examined in the trial: control (without application of fertilizers), N150S80 (application of nitrogen and sulphur at the supply level N: S = 150:80 kg.ha-1), N200S80 and N250S80. Application of nitrogen led to significant increasing of the yields of primary cauliflower florets in case of the dose 200 and 250 kg N.ha-1 (increasing about 87% and 134% compared to control). Applied nitrogen nutrition caused significant nitrates increasing in monitored cauliflower florets in order of the variants: 1 (control) <2 (N = 150 kg.ha-1) <3 (N = 200 kg.ha-1) <4 (N = 250 kg.ha-1), but the highest dosage of nitrates is still under the permissible standard according to Food codex of Slovak republic (700 mg.kg-1 of FM). The influence of differentiated nutrition on sulforaphane content was statistically confirmed in case of the 4th variant in comparison to control, where the decrease about 40% was noticed. Influence of nitrogen fertilizing according to used methodology on vitamin C (AA) content was not statistically confirmed. The nutrient concentration in the curds and stalks of cauliflower varied insignificantly with levels of nitrogen applied.
KOVÁČIK, P., UHER, A., LOŠÁK, T., TAKÁČ, P.: The eff ect of quickly fermented pig manure on the broccoli yield parameters and selected soil parameters. Acta univ. agric. et silvic. Mendel. Brun., 2008, LVI, No. 5, pp. 119-124 The eff ect of Difert (a pig manure fermented by caddices of domestic fl ies produced on sawdust litter) on broccoli yield parameters and selected soil parameters were investigated on gleic fl uvisol in a smallplot fi eld 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 signifi cant. Also a positive eff ect on N, P, K, Ca, Mg contents in broccoli roses was recorded. Difert has a moderate alkalizing eff ect on soil and increases the content of C ox in the soil. Moreover Difert insignifi cantly decreased the content of vitamin C and signifi cantly increased the content of nitrates in broccoli roses, but the worst qualitative eff ect on broccoli parameters was detected by applying mineral N fertilizers, which signifi cantly increased the content of nitrates in broccoli roses and insignifi cantly decreased the vitamin C content. However, it resulted in the highest broccoli yields. The application of mineral N fertilizers had a negative eff ect on the total content of carbon in the soil as well. The eff ect 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.broccoli, yield, vitamin C, manure, fermentation, caddices, domestic fl y Animal breeding technology and the processing of its excrements greatly determine the quality of farm fertilizers. Consequently, they infl uence the mo bili ty of macroelements and microelements in the soil better and the plant sorption ability as well. That results in higher and better quality yields of either fi eld or garden plants (Eghball et al., 2004;Zaller and Köpke, 2004;Kouřimská et al., 2008).The attention to the impact of manure storage (fermentation) techniques on its quality and soil pa ra meters in Slovakia has been lesser in comparison with the neighbouring countries, which causes current average losses of nutrients at the levels of 30-40 % with nitrogen 10 % with phosphorus and 20 % with potassium, in manure production → application cycle (Kováčik, 2005). In eff orts to solve the problem of cutting down the process of manure fermentation, which lasts at least 6 months (sawdust used as litter), maintaining its existing positive eff ects on the soil and plants, Difert (a pig manure fermented by caddices of domestic fl ies for 7 days) has been tested on broccoli yield parameters and selected soil agrochemical parameters. MATERIALS AND METHODSSmall allotment fi eld trial with tested plant broccoli (Fiesta variety) was conducted in area of the Slovak Agriculture Universit...
The small field experiment with broccoli (variety ‚Tiburon F1‘) was established in The Botanical Garden of Slovak University of Agriculture in Nitra. In this experiment, we investigated the effect of four variants of nutrition on the broccoli yield, content of sulforaphane and vitamin C in broccoli florets. The first variant of nutrition was a control one - without application of fertilizers. The second one was fertilized at nitrogen level 200 kg.ha-1. The third one had level of nutriments N : S = 200 : 50 kg.ha-1 and fourth one N : S = 200 : 60 kg.ha-1. In each variant of nutrition, the yield of broccoli was significantly increased in comparison with the control variant. The highest yield of broccoli florets was reached in variant 4 (27.87 t.ha-1). The highest amount of sulforaphane was also determined in variant 4 - 50.93 mg.kg-1 of fresh matter. However, this value did not represent significant increase of sulforaphane content compared to the control variant. The highest content of vitamin C was determined in variant 2 (585.78 mg.kg-1 of fresh matter). In this variant, we achieved significant increase of vitamin C content in comparison with the control variant. Thus, by application of nitrogen and sulphur nutrition, we reached significant increase of broccoli yield compared to the control variant. At the same time, the applied nutrition assisted to enhanced accumulation of sulforaphane and vitamin C in broccoli florets
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