Effect of Brassinolide and Chitosan on Vegetative Growth and some Qualitative Parameters of Local and Blood Orange Fruits. Citrus sinensis L.

Abstract

Abstract The experiment was conducted on orange trees variety(Local orange and blood orange) Citrus sinensis L. for the season 2021, to study the effect of the variety and spraying with Brassinolide regulator at a concentration of 0.015, 0.025 mg L-1 and Chitosan 0.5%, 1% on some vegetative growth characteristics and qualitative characteristics of orange fruits. It was designed using a randomized complete block design, and the difference between the means was tested using the least significant difference test at the 5% probability level. The results showed the superiority of the variety factor, as the local variety (V1) achieved a significant increase in the area of one leaf and the content of leaves from chlorophyll and carbohydrates, while the blood variety (V2) was significantly superior in reducing the acidity of the fruit juice and increasing the content of the fruits of total sugars. Concerning spraying treatments, the spraying with Brassinolide BL2 at a concentration of 0.025 mg L−1 was superior in the area of one leaf, the content of leaves from chlorophyll and carbohydrates and the increase in the content of fruits from total sugars, and the treatment of spraying with Chitosan Ch2 at a concentration of 1% had a significant role in increasing the area of one leaf and Leaves of chlorophyll and carbohydrates.