Response of two Cabbage cultivars (Brassica oleracea L. var. Capitata) to organic and chemical fertilization

The experiment was conducted in the field of vegetables belonging to the Department ofHorticulture and Landscape Gardening, College of Agriculture, Al-Qasim Green University to studythe response of two Cabbage cultivars (Brassica oleracea L. var. Capitata) to organic and chemicalfertilization for the winter agricultural season (2018-2017). The experiment was conducted according tothe Spilt-Plots system within the randomized complete block design (RCBD), with three replicates,where the cultivars were placed in the main plot and the organic and chemical fertilization in the subplot. Two cultivars were used (Green Globe, Roza), and the fertilizer combinations (withoutfertilization, leaf palm residue 20 tons.ha-1, rice residue 20 tons.ha-1, chemical fertilizer 18:18:18 NPKwith the rate of 300 kg.ha-1). The averages were compared using the least significant difference testL.S.D at a probability level of 0.05. The results can be summarized as follows: Green Globe cultivarwas significantly excelled in the traits of (length and diameter of the stem, number of wrapped leaves inthe head, the diameter of the head, the width of the largest leaf in the head, weight of marketablehead). The Roza cultivar has excelled in the traits of (the percentage of nitrogen and protein in theleaves and the leaves content of vitamin C). As for the fertilizer treatments, the fertilizer treatment(NPK) was significantly excelled in (the length and diameter of the stem, the diameter of the head, thewidth of the largest leaf in the head, weight of the marketable head and the head content of vitaminC. The fertilization treatment with rice residues excelled in the percentage of nitrogen and protein inthe leaves. As for the bi-interaction between the cultivar and the added fertilizers, the interactionbetween the Green Globe cultivar and the NPK fertilizer has excelled in the traits of (the length anddiameter of the stem, the diameter of the head, the width of the largest leaf in the head, weight of themarketable head). The bi-interaction between Roza cultivar and NPK fertilizer also exceeded in thetrait of the leaves content of vitamin C.