The effect of nitrogen fertilization on yield and chemical composition of garden rocket (Eruca sativa Mill.) in autumn cultivation
2006
Nurzynska-Wierdak, R.,Lublin Agricultural University (Poland). Dept. of Vegetable Crops and Medicinal Plants
A vegetation experiment was conducted in 2001-02 in an unheated greenhouse on the effect of differentiated nitrogen fertilization on yield and quality of garden rocket. Nitrogen was used in three forms, i.e. lime saltpeter, urea and ammonium sulphate, and in three doses: 0.2, 0.4, 0.6 N/cubic dm (2001) and 0.25, 0.50, 0.75 g N/dm (2002). The plants' growth, yield and content of nutrients were evaluated and an chemical analysis of the substrate after the harvest was conducted. A higher yield of fresh weight was obtained in the treatments with lime saltpetre and urea as compared with ammonium sulphate. Increased doses of nitrogen, independently of the kind of the applied fertilizer, caused a decrease of the yield of rocket fresh weight. The studied plants of garden rocket were characterized by a high content of dry matter, vitamin C, protein, potassium and calcium. The content of nitrates in the dry matter of leaves was within the range 0.02-0.98 percent, depending on nitrogen dose and the year of studies. The application of 0.2-0.25 g N/cubic dm of the substrate in the autumn cultivation of rocket proved to be the most advantageous in view of the highest yield of fresh weight, the highest content of vitamin C and the lowest proportion of nitrates in the leaf dry weight
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