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RESPONSE OF TWO WHEAT CULTIVARS TO DIFFERENT LEVELS OF NITROGEN
FERTILIZATION UNDER TWO WATERING REGIMES IN NEW RECLAIMED AREA
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Abstract: Two field experiments were carried out at the newly reclaimed sandy soil of El-Kossia area, Assiut Governorate, during the two successive growing seasons of 2002/2003 and 2003/2004, to study the effect of different soil moisture levels (irrigation was applied at 50% "normal irrigation" and 75% depletion "water stress" of available soil moisture) and four nitrogen fertilization levels (179, 214, 250 and 286 kg N/ha.) on the yield, yield components, water consumptive use (ET) and water use efficiency (WUE) of two wheat genotypes, i.e. Sohag3 (durum wheat) and Giza 168 (Bread wheat).
Means of squares of all the studied traits were significant in favor of irrigated after the depletion of 50% of the available soil moisture compared irrigation after the depletion of 75% of the available soil moisture. Number of days to heading and physiological maturity decreased when irrigated after the depletion of 75% of the available soil moisture. The wet soil moisture produced the highest plant height, number of spikes /m2, number of kernels/spike, 1000-kernels weight, biological and grain yield t/ha. Moisture stress at dry soil moisture levels reduced biological and grain yield by about 16.12 and 15.21%, respectively, and water consumptive by 18.05% compared with irrigation at 50% depletion in available soil moisture. In generally maximum values of WUE were scored by irrigation at 75% depletion in soil moisture, this could be attributed to the reduction in ET owing the water stress condition with the reduction in grain yield.
Nitrogen fertilization levels had also significant effects on all the studied characters. Increasing nitrogen application levels up to 286 kg N/ha significantly increased number of days to physiological maturity, number of kernels/spike, 1000 kernels weight, biological and grain yield t/ha., while increasing nitrogen rate from 179 to 250 kg N/ha significantly increased number of days to heading. Increasing nitrogen fertilization levels from 179 to 214 kg N/ha significantly increased plant height and number of spikes/m2.
In the average, the wheat cultivar Giza 168 gave higher WUE than Sohag 3, this trend may be duo to high yielding ability of Giza 168.
Finally it can be concluded that for obtaining high grain yield in El-Kossia district, irrigated after the depletion of 50% of the available soil moisture and 250 kg N/ha., should be supplied to Giza168 cultivar.
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| Publication year |
2005
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| Pages |
104-126
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| Availability location |
9 شارع الجامعة- الجيزة
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| Availability number |
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| Organization Name |
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| serial title |
Egypt. J. Of. Appl. Sci
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| Author(s) from ARC |
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| Agris Categories |
Agriculture - General aspects
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AGROVOC
TERMS |
Wheats.
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| Publication Type |
Journal
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