Folia Horticulturae

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Changes in nitrate content of red beet caused by different methods of nitrogen fertilization

Dariusz Grzebelus

Department of Genetics, Plant Breeding and Seed Production
Faculty of Horticulture, Agricultural University
29 Listopada 54, 31-425 Kraków, Poland

Eleven red beet genotypes were grown in 2 localities (Prusy and Wieliczka). Three methods of nitrogen fertilization were applied: A. ammonium nitrate applied prior to sowing, to reach 60 mg of nitrogen per 1 litre of soil; B. additional dose of ammonium nitrate used as top-dressing in July, according to soil analysis, in order to sustain the level of 60 mg of nitrogen per 1 litre of soil; C. additional dose of ammonium nitrate used as top-dressing in July, according to soil analysis, to increase the content of nitrogen in soil to 90 mg/l.

Roots were harvested after 140 days of growth. The randomly chosen roots from each replicate were pulped and analysed ionometrically for nitrate content. Higher nitrogen supply leves increased the nitrate content of the red beets. Differences in nitrate accumulation were observed between the studied cultivars. Cv. Okrągły Ciemnoczerwony showed the lowest level of nitrates. The highest nitrate content was observed in the roots of the 391 A breeding line. Cultivation sites and growth conditions in the two years of trials highly affected the nitrate content of the beet roots.

Grzebelus D., 1995. Changs in nitrate content of red beet caused by different methods of nitrogen fertilization. Folia Horticulturae 7/2: 43-49.