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Effect of differentiated nitrogen fertilization on the content of certain nutritive compounds in winter cabbage heads

Stanisław Rożek, Renata Wojciechowska, Agata Rydz

Department of Plant Physiology
Faculty of Horticulture, University of Agriculture in Kraków
29 Listopada 54, 31-425 Kraków, Poland

The results of three-year (1995-1997) investigations concerning the effect of differentiated nitrogen fertilizer forms and methods of their application on the content of certain constituents in white head cabbage, grown in field conditions, are presented.

During the first two years of the experiment, the placement fertilization with ammonium sulphate and urea increased the level of soluble sugar in cabbage heads in comparison with plants supplied with ammonium nitrate. However, a negative effect of these fertilizers on ascorbic acid level was found.

Broadcast fertilization with reduced nitrogen forms in most cases reduced the total phenols in cabbage heads, in relation to the treatment with ammonium nitrate. The placement fertilization with ammonium sulphate, urea, and a mixture of the two slightly increased the phenol content in comparison with the application of ammonium nitrate.

Application of ammonium sulphate caused only a negligible increase in thiocyanate content in 1996 and 1997, in comparison with the other fertilizers. In the first year of the study nitrogen nutritives containing only its reduced form reduced the total protein level, irrespective of the fertilization method.

Apart from the fertilization factors, the climatic conditions being different in each year of the experiment significantly affected the content of nutritional compounds determined in the cabbage heads.

Rożek S., Wojciechowska R., Rydz A., 2001. Effect of differentiated nitrogen fertilization on the content of certain nutritive compounds in winter cabbage heads. Folia Horticulturae 13/2: 13-22.