Impact of organic fertilizer in different sowing dates on growth, yield and and hormonal containts of cabbage Brassica oleracea var capitate

Resumo

A study included 12 treatments that was carried out outside the University of Mosul's College of Agriculture and Forestry; both are located in Mosul in the Republic of Iraq using a Factorial Experiment. Within. Split-Plot design within the context of a Randomized. Complete. Block. Design. (RCBD). The study included the effects of three factors: two sowing dates (27/8/2025 and 27/9/2025), two methods of application (adding to soil and foliar spraying) and three concentrations of the liquid organic fertilizer TECAMIN MAX (0, 2.5, and 5 ml/l). Each treatment was repeated three times in Copenhagen cabbage plants cultivar. The results of the statistical analysis utilizing the Duncan's multiple-range test with a significance level of 5% showed the following: Plants sowing  in the first date significantly outperformed compared to plants sowing  in the second date in relation to the height of the plant, the number of rolled leaves, the marketable head weight rate, and the marketable yield per unit area. When compared to the spraying approach, the addition to the soil method resulted in a considerable increase in the marketable of head weight as well as the marketable yield per unit area. Plants that were given either dosage of organic fertilizer had a substantial effect on all of the characteristics that were investigated, with the exception of the 2.5 ml dose. Leaves content of growth hormones GA3 and IAA increased significantly when plants were grown on the first date compared to plants grown on the second date. The use of both concentrations of 2.5 and 5 ml per liter of organic fertilizer TECAMIN TEXT resulted in a significant increase of these two hormones in the leaves compared to the control treatment.