Response of flame seedless grapes to sulphur and different nitrogen sources and application times under calcareous soil and drainage irrigation water II. maturity, harvest spread and fruit postharvest physiochemical qualityt [electronic resource].

Includes references.

This investigation was carried out during 2001 and 2002 seasons to study the maturity, spread harvest and fruit postharvest physiochemical quality of Flame Seedless grapevines grown in calcareous soil and irrigated with drainage water as influenced by different sources and doses of nitrogen fertilizer and sulphur applications. The obtained results could be summarized as follows: 1. Regardless of the nitrogen application doses and sulphur rates, the urea and ammonium nitrate increased cluster weight and length and berry weight, volume, diameter, length, TSS, reducing sugars and anthocyanin content during both seasons. In the meantime, the urea application increased berries uniformity and maturity in both seasons. The ammonium sulphate application increased berry firmness and harvest spread in both seasons. Both berry acidity and non-reducing sugars were not affected by any of nitrogen fertilizer sources. 2. Regardless of nitrogen sources and sulphur rates, the addition of nitrogen at three equal doses increased cluster weight and length and berry weight, volume, diameter, length, TSS, reducing sugars and anthocyanin and fruit maturity and uniformity in both seasons. The addition of nitrogen at one dose increased berry firmness and harvest spread in both seasons. No differences between the three times on berry acidity and non-reducing sugars.

Summary in Arabic.

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