Response of onion plants to the fertilization by nitrogen sources and agricultural sulphur rates [electronic resource].

Includes references.

Two field experiments were carried out at the experimental station of National Research Centre, at Shalakan, Kalubia Governorate during the two successive growing seasons of 200412005 and 2005/2006 to study the additioneffect of sulphur levels (0. 150 and 300 kg/fed) and nitrogen source (cattle manure. compost ammonium nitrate and ammonium sUlphate) on growth, yield and bulb quality of onion plants cv. Giza, 20. Results show that the vegetative growth Ie plant length, number of leaves fresh and dry weight of leaves. neck and bulb diameter. bulbing ratio as well as fresh and dry weight of bulb as well as bulb yield and some physical and chemical characteristic (bulb weight. diameter and height as well as bulb content of TSS. N. P K, total protein and total carbohydrate) were significantiy Increased by increasing the level of S-application Results also clear thaI the vegetative growth characteristic and bulb yield and its quality recorded their highest values by using ammonium sUlphate as nitrogen source, however, cattle manure gave the lowest values of vegetative growth and bulb Yield

Summary in Arabic.

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