Response of Two Hybrids of Roses to Organic Media and Biofertilizer in Vegetative and Floral Growth and Peroxidase Enzyme

Abstract

Abstract The experiment was conducted at Research Station B, College of Agricultural Engineering sciences, University of Baghdad-Jadriyah, on the rose plant for the growing season 2022 2023. The response of two hybrids of roses to organic media and biofertilizer in vegetative and floral growth and peroxidase enzyme was investigated. The experiment was conducted using a randomized complete block design with a split-plot arrangement with three replications. The experiment included three factors. The first factor two rose hybrids (Brighton and Pink-Martini), allocated to the main-plots. rice straw at two levels (2 and 4 kg/m2, sugarcane bagasse residues at two levels (2 and 4 kg/m2), in addition to a control treatment without additives The third factor represented bio fertilization by adding Azospirillum and Trichoderma. Trichoderma was added to the soil at a rate of 75 g per square meter, and Azospirillum was treated by soaking the roots for 20 minutes before planting. The plants were then planted according to the experimental design. The results showed that the three-way interaction between the hybrids, organic media, and biofertilizer showed the superiority of the treatment A1B2C1 in flower diameter and peroxidase enzyme, with an average of 12.00 cm and 1.76, respectively. The hybrid grown in the organic medium of 2 kg of rice husks B1 treated with Azospirillum bacteria was superior in carbohydrate content and leaf zinc content. The treatment A2B2C1 significantly outperformed in the number of leaves, length of the Flower pedicle, and total chlorophyll content of the leaves, with an average of 99.33 leaves plant-1, 40.55 cm, and 510.47, respectively. The two-way interaction between organic media and biofertilizer showed superiority of most traits in the number of leaves (92.75 leaves plant-1), length of the Flower pedicle (37.47 cm), and chlorophyll content (417.00) for treatment A2B2, with treatment A2C1 being superior in the number of leaves, length of flower pedicle, chlorophyll content, percentage of dry matter in the leaves, and carbohydrate and zinc content of the leaves. The hybrids Brighton was superior for most traits, while the factor of organic media showed the superiority of B1 in length of the flower pedicle and carbohydrate content of the leaves, as well as content of the elements iron and zinc. The significant superiority of Azospirillum bacteria for all traits of rose plants.