Published in Scientific Papers. Series B, Horticulture, Volume LX
Written by Constanța ALEXE, Marian VINTILĂ, Gheorghe LĂMUREANU, Adrian CHIRA, Lenuța CHIRA
The purpose of this paper is to establish the influence of nitrogen fertilization of the cabbage crop on its preserving capacity. The paper presents the results obtained in the period 2014-2015 on quality maintaining of the white cabbage after harvesting. There were studied two varieties of cabbage: Gredana - summer, Danish variety and Buzoiana, autumn, Romanian variety. The culture was fertilized with nitrogen in the following doses: 100; 200; 300 and 400 kg active substance N/ha. Cabbage was kept in cold conditions (temperature = 0-2ºC, relative humidity = 85-90%) for a period of 50 days - summer variety or 110 days - autumn variety. After storage determinations were performed on the weight losses (expressed by evaporate-transpiration), the losses by conditioning (resulted by removing yellowed leaves, of diseased ones and of the spine) and the main biochemical components. Researches show that the influence of nitrogen fertilization on maintaining of the quality of white cabbage during the preservation period is negative only at high doses (over 200 kg active substance N/ha). In case of dosages of 300 and 400 kg active substance N/ha losses were recorded of up to over 30% after 110 days of preservation of autumn cabbage. Therefore, in the case of cabbage destined to preservation it is not recommended the use of fertilizers in dosages greater than 200 kg active substance N/ha. The value of the main biochemical components is not strongly influenced by the dose of fertilizer applied to the crop. However one can notice an increase in the protein substances and a slight decrease of the values of ascorbic acid, total sugars and cellulose, from variant control (unfertilized) to variant with 400 kg active substance N/ha.
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