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Published in Scientific Papers. Series B, Horticulture, Vol. LXVII, Issue 1
Written by Stoyan FILIPOV, Kostadin KOSTADINOV, Radoslav CHIPINSKI, Nadejda SHOPOVA

In an experiment with greenhouse radishes grown according to biological production technology during the period 2018-2020, the influence of the variety, the cultivation scheme, the method of sowing and the applied biological fertilizers on the morphological characteristics and productivity of the crop was evaluated.In scattered sowing, the mass of the whole plant, the mass and the diameter of the root crop were positively affected by the applied biological fertilizers. The yield of ties per unit area has increased to a greater extent in the Edri red variety compared to the Saxa variety. On the other hand, the Large Reds variety has from 12.9% to 23.7% higher average yield in all fertilizing options compared to the control, and in the Saxa variety from 7.3% to 13.2%. In scattered sowing, the highest yield was reported when fertilizing with Italpolina of 8718 connections/dec in the Large Reds variety and 6918 connections/dec in the Saxa variety. The influence of biological fertilization in row sowing is more pronounced and has been proven statistically in both varieties and in all fertilization options. Row sowing gave a higher yield with 11.3% in both varieties. As with scattered sowing, the Edri red variety has a 15.9% to 24.9% higher yield with all fertilization options. The highest productivity was obtained for variant fertilizing with Italpolina in the Large Reds variety 9950 bunch/ha-1 and in the Saxa variety 8906 bunch/ha-1.Organic fertilizers did not lead to the accumulation of excessive amounts of nitrates in both varieties, but varietal differentiation was confirmed. In scattered sowing, they were from 1118.4 mg/kg to 1407.3 mg/kg in the Saxa variety and in Large Reds from 1023.7 mg/kg to 1131.4 mg/kg. Nitrates in row sowing are lower and vary from 969.7 mg/kg to 1051.8 mg/kg for Large Reds variety and for Saxa from 1118.4 mg/kg to 1407.3 mg/kg.

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