Spring cabbage yield and quality as related to nitrogen fertilizer type and method of fertilizer application.

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.