Abstract
The trails were conducted in the experimental field of the Maritsa Vegetable Crops Research Institute (MVCRI), Plovdiv with head cabbage variety Bilyan and broccoli variety Marathon F1. The crops were grown according to the scheme 100+60/60cm (2083 plants/da). Two variants have been studied in the experiment: optimal mineral fertilization – 50kg/da phosphate fertilizer, 40kg/da potassium fertilizer and 30kg/da nitrogen fertilizer (control) and combined fertilization with Stimak P – organic soil fertilizer (0,500-1,5kg/da), Stimak – foliar fertilizer (200ml/da) and Simargal – microbial fertilizer (0,5 ml/plant).Cole crops grown for late field production with drip irrigation technology were found to respond positively to combined fertilization with microorganisms and organic fertilizers through the drip system and foliar fertilizer together with the treatment of plants with plant protection products. As a result of combined fertilization the yield, in comparison to the optimal mineral fertilization, was increase with 31,01% and 46,85% Bilyan and Marathon F1 varieties of cabbage and broccoli, respectively.
Keywords: broccoli, cabbage, combined fertilization