Effect of adding Bio-humic fertilizer and planting date on vegetative and chemical growth characteristics of onion Allium cepa L.

Abstract

The experiment was carried out in Dhi Qar Governorate - Nasiriyah City - Al-Mustafawiyah area, for the agricultural season 2023/2024 in one of the open plastic houses affiliated with the Agricultural Research Station for the fields of the Department of Horticulture and Landscape Engineering - College of Agriculture and Marshes, University of Dhi Qar. In a sandy loam soil to studying the effect of adding Bio-humic fertilizer and planting date on the vegetative growth characteristics and chemical characteristics of plant onion Allium cepa L. The experiment was carried out using a Randomized Complete Block Design (R.C.B.D). The experiment included four treatments for adding biohumic fertilizer - control treatment (spraying with distilled water only), concentration (3) kg. ha-1, concentration (6) kg. ha-1, concentration (9) kg. ha-1 and three treatments for planting dates - the first date 10.20.2023, 01.11.2023 and the third date 10.11.2023. The addition of biofertilizer at a concentration of 6 kg.ha-1 was superior in giving the highest plant height, number of leaves, weight of the vegetative group, chlorophyll content of the leaves, and carbohydrate content of the leaves if it reached 91.67 cm, it reached 15.22 leaves, and the onion reached 38.54 g. 89 mg-1.100 g dry weight 29.00 mg.g-1 dry weight respectively, and the first date (10/20) was superior in plant height, number of tubular leaves, diameter of the onion neck, and dry weight of the vegetative group.