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SummaryEntec 26 a new concept nitrogen fertilizer containing DMPP nitrification inhibitor was evaluated as a source of N for red beet and celeriac in field studies conducted in [2003][2004][2005][2006] Results of the study showed that Entec 26 was equally valuable source of N for red beet as ammonium nitrate and calcium nitrate and more efficient than ammonium sulphate. In experiment with celeriac, plants supplied with this fertilizer in split doses overyielded those receiving ammonium nitrate in the same amounts. The important advantageous effect of Entec 26 use was a considerable reduction of nitrates accumulation in red beet grown for bunches and in celeriac roots.

Response of Chinese cabbage grown in the spring season to differentiated forms of nitrogen fertilisationIn the experiment carried out in the Experimental Station belonging to the Wrocław University of Environmental and Life Sciences in 2004-2006, we estimated the effect of the type of the nitrogen fertiliser (ammonium nitrate, calcium nitrate, ammonium sulfate, urea and ENTEC 26) applied as preplant (150 kg N ha-1) or split dose (100 + 50 kg N ha-1) on the yield and dry matter content, nitrates, vitamin C and P, K, Mg, Ca in ‘Optiko’ Chinese cabbage cultivated during the spring season. The highest total and marketable yield of Chinese cabbage was recorded after the use of urea, which was partly associated with the lowest percentage of diseased heads. Plants fertilised with ammonium sulfate provided the lowest yield. The method of nitrogen application significantly affected the yield and the mean weight of individual heads in the marketable yield, but not the accumulation of nitrates and vitamin C. The lowest accumulation of nitrates was associated with the use of ammonium sulfate and ENTEC 26, whereas the highest with urea. The use of calcium nitrate at a single dose of 150 kg N ha-1led to the highest accumulation of vitamin C in Chinese cabbage leaves. The levels of P, K, Mg and Ca showed only small changes and were not significantly affected by the type of nitrogen fertiliser or the method of its application.

The Influence of Seedlings Age and Pots Size on Growth and Yielding of Chinese Cabbage in Spring and Autumn CultivationTwo parallel experiments in two factorial design using the method of random sub-blocks in four replications were conducted in 2002-2004 at the Experimental Station of the Horticulture Department of University of Environmental and Life Sciences in Wrocław. The effect of seedlings age (3, 4, 5-weekly) and diameter of pots (25, 32, 44, 55 mm) on the yield of Chinese cabbage cultivar Optiko grown in spring and autumn was evaluated. The highest marketable yield in spring and autumn during the harvest from all objects at the same time was obtained from 5-weekly seedlings grown in pots with a diameter of 55 mm. The use of younger seedlings from pots with smaller diameters was decreased the yielding of cabbage and influenced on forming the smaller heads. Spring cultivation period in comparison to autumn was allowed to obtain a higher marketable yield of Chinese cabbage with a smaller share of not fully grown head cabbage in total yield but a greater share of decay head.