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.