The Effect of the Brassinolide Growth Regulator and Organic Fertilizer on The Nutritional and Mineral Elements of Orange Seedlings
The Effect of the Brassinolide Growth Regulator and Organic Fertilizer on The Nutritional and Mineral Elements of Orange Seedlings
Israa Kareem Abdulhussein Al-Kanani and Harith Mahmood Azeez Al-Tamimi*
ABSTRACT
The fruit tree planting business has continually experienced growth because of increasing demand for fresh, locally grown fruits. This experiment was carried out at the Horticulture Station located in the Al-Hindiya district of Kerbala, Iraq, during the 2023 growing season. A completely randomized design with three replications was employed. This study intended to assess the response of two orange varieties, Blood and Navel, when subjected to foliar application of the growth regulator Brassinolide at three levels (0, 0.3, and 0.6 mg/L) and the addition of HumZinc to the soil at three different levels (0, 0.5, and 1 g/L) with the purpose of improving the nutritional and mineral seedlings’ contents. The results showed that the Blood variety had all nutritional contents higher than the Navel variety.The treatment with Brassinolide at 0.6 mg/L or the application of HumZinc at 1 g/L was the most influential with regard to the increases in leaf content of carbohydrates, proteins, and nitrogen (N). The interactions among the factors studied were also significant as contributors to better nutritional and chemical properties of the orange seedlings. The highest yield was recorded when the Blood variety was treated with 0.6 mg/L Brassinolide and 1 g/L HumZinc, as it showed the highest amount of carbohydrates 19.10%, proteins 16.67%, and nitrogen 2.67 % in leaves, respectively. In conclusion, the application of either foliar Brassinolide or soil-applied HumZinc or in combination considerably enhanced the nutritional value both Blood and Navel orange seedlings.
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