Biological features. At a temperature of 18-20°C and soil moisture of 70% FPV, shoots appear in 4-6 days. The optimum temperature for leaf growth is 18-22°C, and for root crops 16-18°C. A long-day plant, light-demanding, for the normal formation of root crops, a light flux intensity of at least 2000 lux is required. Therefore, it is necessary to monitor, especially in the early stages, so that there is no thickening of crops. Radish is moisture-loving, but does not tolerate stagnant water. Optimal reaction of the medium at pH=5.5-7.4. Most of all consumes nitrogen and potassium. When fertilizing, it is necessary to maintain a N:P:K ratio of 1:0.5:1, otherwise excessive accumulation of nitrates is possible. Poorly responds to the content of chlorides in the soil solution.
Variety selection. Currently, there are many professional grades for protected ground. According to our data, the following hybrids and varieties are suitable for very early and late sowing dates: Estared (Marinda), Novired (Marinda), Radius (Enza Zaden), Content (Enza Zaden), Sirius (Enza Zaden) , Tarzan (Enza Zaden), Cartago (Ryk Zwaan), Spirit (Ryk Zwaan), Scorpio (Ryk Zwaan), Helro (Ryk Zwaan), Donar (Novartis seeds) and Presto (Quedlinburg Saatzucht). In Germany, hybrids Tarzan, Content and Donar showed high results in the spring turnover of glazed greenhouses (Heine G. and Dreyer S., 2000).
Growing technology. Sowing dates: the earliest the last days of January, the latest mid-September. Before sowing, it is imperative to check the soil for the presence of keel, as well as water-charging irrigation, so that the supply of productive moisture is 55-65 mm.
Sowing is done with precision seed drills. Sowing depth 1.0-1.5 cm. Seeding rate 4-5 kg/m2. Row spacing 7-10 cm, inside the row 3-5 cm. C, on cloudy days 12-14°C. Soil temperature 12-16°C. Perhaps it is more optimal to consider the temperature regime proposed by T. Geisler in table No. 4.
Optimum air humidity 70-80% and soil 70% of the FPV. The additional introduction of carbon dioxide into the air of the greenhouse up to a content of 0.1% by volume in the winter months increases the yield and reduces the duration of cultivation by 1-2 weeks.
Growing period and yield depending on the sowing date. Cleaning is carried out completely. Shelf life with tops at a low temperature of 0-1 ° C is about a week, without tops packed in a film for at least 6 weeks.