height, leaves number /plant and bulb diameter were significantly increased with increasing irrigation to I 4 treatments in the three seasons. Giza Red variety significantly surpassed Giza 6 Mohassan and Giza 20 in these growth characters in all seasons. Growth attributes were significantly affected by the interaction between irrigation and varieties except for plant height in the 1 st and 3 rd seasons and bulb diameter in the 2 nd season. 2-Irrigation treatments and varieties significantly affected bulb weight, dry matter presentage, days to maturity, marketable yield, culb and total yield in the three season. The higher values of marketable yield, i.e. 12.60, 13.06 and 13.45 t/fed., as well as total yield, i.e. 15.74, 15.37 and 16.10 t/fed.
Two field experiments were conducted during the two successive seasons of 2007/2008 and 2008/2009, at Sids Agricultural Research Station, Bani Sweif Governorate. The objectives of this investigation was aimed to studies productivity and storage quality of some onion cultivars i.e. (Shandaweel 1, Giza 6 Mohassan and Giza 20), when cultivated by two cultivating methods (using sets and seedlings), and using three onion cultivars under Middle Egypt conditions. The obtained results could be summarized as the following: 1. The shortest season was obtained by Shandaweel 1 cultivar followed by Giza 6 Mohassan while Giza 20 appeared the longest season, in both seasons. Giza 20 cultivar appeared the highest values of average bulb weight and single bulbs%, while Shandaweel 1 cultivar appeared the lowest values. Giza 20 cultivar attained the lowest values of double bulbs%, while Shandaweel 1 attained the highest values. Giza 6 Mohassan appeared the minimum values of bolter%, whereas shandaweel1 appeared the maximum values. The maximum values of marketable yield/fed and total yield/fed were obtained by Giza 20 cultivar, while the lowest values were obtained by Shandaweel 1. 2. Planting onion by seedlings gave higher values of average bulb weight and single bulbs% as compared to planting by sets in both seasons. Seedlings cultivating method gave lower values of double bulbs% and bolters% as compared to sets cultivating method. The values of marketable yield/fed and total bulb yield/fed of onion under seedlings cultivating method surpassed those under sets cultivating method 3. The lowest values of decayed and sprouted bulbs% were obtained by the combination between seedlings cultivating method and Giza 6 Mohassan, at all storage periods in both seasons, except for this at 180 days in the first season. 4. Cultivating onion by seedling and using Giza 6 Mohassan cultivar attained the lowest values of bulbs weight loss% at all storage periods, in both seasons. 5. The interaction between onion cultivars and method of cultivation significantly affected single bulbs %, average bulb weight (gm), bolters % and infected bulb. It could be concluded that for maxi mixing onion yield and it is quality during storage by cultivation of Giza 20 cultivar using seedlings method under cultivation of Bani Sweif Governorate.
The objective of this experiment was to study the effect of four times of potassium application i.e., 100% before transplanting (BT), 50% BT + 50% at 30 days after transplanting (DAT), 50% K at BT + 50% K at 60 DAT and 50% K at 30 DAT + 50% K at 60 DAT. Three urea rates as foliar spray i.e. 2, 4, and 6 g/l on vegetative growth at 90 and 120 DAT, yield and yield components, quality and storability of onion. The main important findings were as follows: 1-Plant height, bulbing ratio, plant fresh weight and plant dry weight recorded maximum mean values by adding 50% of potassium fertilizer at 30 DAT and 50% at 60 DAT at two growth stages in both seasons, except for plant height at 120 DAT in the first season and bulbing ratio at 90 DAT in both seasons. 2-Adding 50% of potassium at 30 DAT and 50% at 60 DAT attained the highest average of bulb weight, marketable yield/fed., culls yield/fed. and total yield/fed. While, adding 50% of potassium before transplanting and 50% at 60 DAT attained the lowest ones in both seasons. 3-Increasing urea rate as foliar spray from 2 to 4 or 6 g/l significantly increased mean values of plant height, plant fresh weight and plant dry weight at two growth stages, in both seasons. 4-Spraying onion plants with 6 g/l of urea attained of average bulb weight, marketable yield/fed., culls yield/fed. and total yield/fed. While spraying onion plants with 2 g/l gave lowest ones of all studied characters, except for culls yield/fed. in the second season. 5-Results showed that highest percentages of TSS% and dry matter% were obtained by adding 50% of potassium before transplanting and 50% at 60 DAT, while the smallest ones were obtained by adding 50% of potassium at 30 DAT and 50% at 60 DAT in both seasons. 6-Increasing urea as foliar spray rate from 2 g/l to 4 or 6 g/l decreased mean values of TSS% and dry matter % in both seasons. 7-Results indicated that highest average of bulb weight, marketable yield/fed. and total yield/fed. were achieved by adding 50% of potassium at 30 DAT and 50% at 60 DAT when plants were sprayed with 6 g/l of urea in both seasons. It could be concluded that adding 50% of potassium at 30 DAT and 50% at 60 DAT and spraying onion plants with 6 g/l of urea.could be recommended for optimum onion yield per unit area.
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