W. Sady et al., Spring cabbage yield and quality as related to nitrogen fertilizer type and method of fertilizer application., ACTA HORT, (506), 1999, pp. 77-80
The results of a two-year experiment to examine the effects of different fo
rms of nitrogen fertiliser on the yield and quality of spring cabbage grown
in a plastic tunnel are presented. The changes in soluble sugars, ascorbic
acid and total phenols in cabbage heads during short-term storage at 20 de
grees C and 5 degrees C were also investigated. No significant effect of th
e form of nitrogen fertilizer on the yield, mean weight of heads and dry ma
tter content were observed. However, placement of ammonium sulphate and ure
a caused a significant increase in soluble sugars compared to broadcast fer
tilization with potassium nitrate. The changes in chemical composition of t
he cabbage heads during short-term storage also depended on the form of nit
rogen fertilizer used.