Rape is the most crucial oil plant cultivated in Poland. The plant has a strong taproot system of the length of 50-60 cm before winter, and up to 120-290 cm during the peak of its growth. Proper plant development during autumnal months determines its yielding capabilities. Prior to winter, the root collar should be the thickest (1-2 cm), whereas its rosette should feature 8-10 leaves.
Rape favours wet climate and produces better yield in areas of high air humidity. Young plants of rape can survive temperatures of -15ºC, and if covered with snow, even of -30ºC. Yet, the flower buds are susceptible to slight frosts in May.
Taking all the requirements presented above into account, it is necessary to apply preparations enhancing the plant’s resistance to inauspicious conditions during the vegetation period such as droughts, high temperatures, intensive sunlight, and susceptibility to fungal diseases and clubroot. It is essential to supplement root development due to the nutritional requirements – the stronger a root, the better nutrient absorption from soil, which, in turn, boosts yield quantity and quality.
On average, with 1 tonne of seeds and appropriate amount of straw, it absorbs: 50-60 kg of nitrogen (N), 24 kg of phosphorus (P2O5), 50-60 kg of potassium (K2O), 50-60 kg of calcium (CaO), 8-10 kg of magnesium (MgO), 8-12 kg of sulphur (S), or 20-30 kg when calculated in SO 3, 60 g of boron (B), 10-40 g of copper (Cu), 100 g of manganese (Mn), 1-2 g of molybdenum (Mo), and 60-150 g of zinc (Zn).