An experiment was conducted in Al-Haronia district of Al-Muqdadiyah city in Province of Diyala during the agricultural season of 2013-2014 to investigate the effect of vernalization by four application methods (unvernalized plants, vernalized plants by seeds, vernalized saplings and vernalized by seeds and saplings). It deals with effect of Gibberellins spraying with three rates of concentration 0, 75 and 150 mg/L as well as the effect of Humic acids spray with three rates of concentration 0, 100 and 200 mg/L in growth and harvest of cabbage (Brassica oleracea var. capitat). A factorial experiment was fulfilled by using a Split-split plot design and three blocks. The outcomes proved that Humic acids, Gibberellins and vernalization have statistically significant impact on the features of vegetative growth and certain effect on the product with significant varieties among the applications specifically that of comparison. The veranlized plants by seeds were of higher values in terms of (percentage of chlorophyll in outer leaves, the required duration for emergence of 50% of cabbage head, diameter of cabbage head). The values can be distributed respectively as follows (54.51 Spad, 43.96 day, 25.81 cm). The sprayed plants by Gibberellins proved higher values particularly with concentration of 150 mg/L in terms of the following features (space of outer leaves, content of chlorophyll in outer leaves). The values can be distributed respectively (1107.87 cm²/plant, Spad 54.63, and 26.33 ton per donam (1000 sq.m). The sprayed plants by Gibberellins with concentration of 75 mg/L proved higher values in terms of the following features (the required duration for emergence and growth of 50% of cabbage heads and the diameter of cabbage heads) and their values were distributed respectively (42.16 day and 24.69 cm). The sprayed plants by of Humic acids with concentration of 200 mg/L proved higher levels in the following features (percentage of chlorophyll in outer leaves, the required duration for emergence of 50% of cabbage heads) and their values were listed respectively out of the following: 55.59 Spad ,44.00 day, 25.26 cm). In respect to triple interferences or three-way interactions, the vernalized plants by seeds and sprayed plants by Gibberellins with concentration of 75 mg/L and the sprayed plants by humic acids with concentration of 200 mg/L presented higher values in the following characteristics (the required duration for the emergence of 50% of the cabbage head, the diameter of the cabbage heads, and their values are presented respectively: (38.66 day, 30.66 cm). The vernalized plants by seeds and sprayed plants by Gibberellins with concentration of 150 mg/L along with sprayed plants by humic acids with concentration of 200 mg/L showed higher values in the following features (substance of chlorophyll in outer leaves successively as in (61.83 Spad). The unvernalized plants and sprayed plants by Gibberellins with concentration 150 mg/L and the sprayed plants by humic acids with concentration of 100 mg/L showed higher values in the following features (the size of outer leaves and their values are listed respectively as in (1355.72 cm²/plant).

Keywords: Cabbage; Vernalization; Gibberellin; Humic Acid;