YIELD AND SOME CROP - WATER RELATIONSHIPS OF ONION UNDER DIFFERENT IRRIGATION REGIMES AND LIQUID AMMONIA FERTILIZATION LEVELS | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 6, Volume 4, Issue 5, May 2013, Page 507-518 PDF (631.38 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2013.51924 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| M. R. K. Ashry | ||||
| Soils, Water and Environment Res. Inst., A.R.C., Giza, Egypt | ||||
| Abstract | ||||
| A field experiment was conducted at Tameia Agric.Res. station, Fayoum Governorate, during 2010/2011 season and repeated in 2011/2012 one, aiming at studying the effect of irrigation regimes as different available soil moisture depletion (ASMD) and N - fertilization levels as (100,120 and140 Kg.N fed-1 soil – injected ammonia gas) on onion bulb yield, yield components and some crop - water relations. To achieve the previous targets, N fertilization levels i.e. 100, 120 and 140 kg N/fed were combined with three irrigation regimes i.e. irrigation at 35, 55 and 75% ASMD in a strip-plot design with four replicates. The main obtained results could be summarized as follows:- 1. Onion bulbs yield and yield components were significantly affected by the adopted both N fertilization levels and irrigation regimes and their interaction as well in both seasons. 2. The highest averages of bulb weight, bulb diameter and bulbs yields (18.750 and 17.910 t fed-1) were detected from applying 140 kg N fed-1 and irrigation at 35% ASMD interaction, whereas the lowest figures resulted from the interaction of 140 kg N fed-1 level and irrigation at 35% ASMD, in 2010/2011and 2011/2012 seasons. 3. Seasonal evapotranspiration (ETC)., as a function of N -fertilization levels and irrigation regimes were 35.03 and 33.85 cm in 2010/2011 and 2011/2012 seasons, respectively. The highest ETC values (40.32 and 39.11 cm) resulted from applying 140 kg N fed-1 and irrigation at 35% ASMD in the two successive seasons. Applying 100 kg N fed-1 and irrigation at 75% ASMD gave the lowest ETC values which comprised 29.93 and 29.06 cm in 2010/2011 and 2011/2012 seasons, respectively. 4. The crop coefficient (KC) values were 0.56, 0.69, 0.79, 0.94 and 0.74 for December, January, February, March and April, respectively, ( two seasons average of the highest yielding interaction e.g. supplying N at 140 kg fed-1 rate and irrigating at 35%ASMD). 5. The highest water use efficiency values in 2010/2011 and 2011/2012 seasons (10.054 and 10.903 kg dry bulbs m-3 water consumed, respectively) were detected from applying 140 kg N fed-1 and irrigation at 35% ASMD. | ||||
| Keywords | ||||
| Onion yield; ammonia gas fertilization; irrigation regimes; crop - water relations | ||||
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