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

Abstract

ABSTRACT The experiment was conducted in the field of vegetables belonging to the Department of Horticulture and Landscape Gardening, College of Agriculture, Al-Qasim Green University to study the response of two Cabbage cultivars (Brassica oleracea L. var. Capitata) to organic and chemical fertilization for the winter agricultural season (2018-2017). The experiment was conducted according to the 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 sub-plot. Two cultivars were used (Green Globe, Roza), and the fertilizer combinations (without fertilization, leaf palm residue 20 tons.ha-1, rice residue 20 tons.ha-1, chemical fertilizer 18:18:18 NPK with the rate of 300 kg.ha-1). The averages were compared using the least significant difference test L.S.D at a probability level of 0.05. The results can be summarized as follows: Green Globe cultivar was significantly excelled in the traits of (length and diameter of the stem, number of wrapped leaves in the head, the diameter of the head, the width of the largest leaf in the head, weight of marketable head). The Roza cultivar has excelled in the traits of (the percentage of nitrogen and protein in the leaves 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, the width of the largest leaf in the head, weight of the marketable head and the head content of vitamin C. The fertilization treatment with rice residues excelled in the percentage of nitrogen and protein in the leaves. As for the bi-interaction between the cultivar and the added fertilizers, the interaction between the Green Globe cultivar and the NPK fertilizer has excelled in the traits of (the length and diameter of the stem, the diameter of the head, the width of the largest leaf in the head, weight of the marketable head). The bi-interaction between Roza cultivar and NPK fertilizer also exceeded in the trait of the leaves content of vitamin C.