Document Type : Original Article
Authors
1
Senior researcher at the Agricultural Research Center- Field Crop Research Institute- Onion Research Department., Giza, Egypt.
2
soil fertility and plant nutrition, soils, water and environment institute, Giza, Egypt.
Abstract
TO explore the influence of varied nitrogen rates and foliar spraying of natural stimulants on vegetative growth, yield, and onion quality. This experiment was carried out over the two seasons 2019-2020 and 2020-2021 to investigate nitrogen fertilizer at rates: 144, 216, and 288 kg N ha-1 and natural stimulant treatments (yeast extract, fulvic acid, amino acids, and seaweed extract). The results clearly demonstrated that raising the nitrogen rate from 144 to 288 kg N ha-1 significantly enhanced the leaves number of plant-1, fresh weight of plant, average weight of bulb, marketable bulb yield, double bulbs, bulbs diameter, TSS, dry matter, nitrogen, phosphorus, potassium, carbohydrate, and protein content. Foliar spraying with natural stimulators (yeast extract, fulvic acid, amino acids, seaweed extract) significantly increased plant height, leaves number/plant, fresh weight of plant, neck, and bulbs diameter, bulbing ratio, average bulb weight, marketable bulb yield, culls bulb yield, double bulbs, bulb diameter, TSS, dry matter, nitrogen, phosphorus, potassium, carbohydrate, and protein, during both seasons. The nitrogen at rate of 288 kg N ha-1 combined with amino acids spraying appeared the highest mean values of average bulb weight during the 1st season and marketable yield during the two seasons. The highest value of dry matter was achieved by fertilizing by 216 kg N ha-1 when spraying with fulvic acids during both seasons.
Keywords
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