NUTRIENTS UPTAKE AND YIELED OF ONION PLANT AS AFFECTED BY NITROGEN FERTILIZATION, IRRIGATION WATER SALINITY, IRRIGATION WATER SAR AND THEIR INTERACTION IN SANDY SOILS. | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 10, Volume 28, Issue 7, July 2003, Page 5845-5859 PDF (2.16 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2003.252690 | ||||
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| Author | ||||
| G. Labeeb, | ||||
| Solis Department, Faculty of Agriculture, Mansoura University | ||||
| Abstract | ||||
| A pot experiment was performed at Soils Department. Faculty Of Agriculture Mansoura University during 2002 growing season, to study the effect of nitrogen fertilization {0.606,O.909 and 1.212 g nitrogen pol" , irrigation water salinity levels (0.4, 1.0,2.0 and 3.0 d'Srn") , water sodium adsorption ratio values (3.5, 7.0 and 14.0) and their interaction on nutrients uptake and yield of onion plant. The obtained results showed that.: Under the experimental conditions, the relative bulbs fresh weight was decreased by 62.76% whenever the irrigation water salinity was increased from 0.4 dsrn' (control) to 3.0 dSm" . Also, raising the irrigation water SAR value from 3.5 to 14.0 decreased the bulbs fresh weight by 31.19 %. The bulbs fresh weight was increased as nitrogen fertilization dose Increased at any level of irrigation water salinity and / or irrigation water SAR value, and the positive effect of 19m nitrogen addition pol" is equal to the negative effect of raising irrigation water salinity by 1.412 dSm" or raising SAR of the irrigation water by 13.851 . The bulbs fresh weight return was increased as a result of increasing the nitrogen applied dose, from N1 to N3 with increasing the irrigation water SAR up to the highest level was used under the lowest level of irrigation water salinity ,while, under the highest one, the adverse trend was obtained with the same raising of both N fertilization and irrigation water SAR . Raising the nitrogen fertilization dose, reduced the culls dry weight / bulbs +culls dry weights ratio in contrary to the effect of the higher irrigation water salinity and lor irrigation water SAR. Within the studied range, increasing the nitrogen applied dose led to improve the nitrogen distribution pattern among the plant parts against to the effect of higher salinity and / or sodicity of irrigation water. The relative phosphorus use efficiency, was increased by 50.48 % with increasing the nitrogen applied dose, from N 1 to N3 at the first level each, irrigation water salinity and irrigation water SAR. Increasing the irrigation water salinity increased from 0.4 to 2.0 dSm'\ , beside increasing the N applied dose from N1 to N 3 the relative phosphorus use efficiency was increased by 1 5.797% . Raising t he irrigation water SAR from 3.5 to 14.0 beside the previous increase in both N fertilization . and irrigation water salinity reduced the relative phosphorus use efficiency by 22.417 % The highest irrigation water salinity and lor irrigation water SAR decreased the potassium uptake by bulbs more than in other parts, and nitrogen increased the potassium uptake by bulbs more than in other parts. The multi linear regression equations revealed that ,raising the irrigation water SAR by unity caused a negative effect approximately equal to that of 1/10 dsm' , with respect of fresh or dry matter production. and equal to that of 2110 dSm" with respect of total nitrogen, phosphorus and potassium uptake. Hence raising irrigation water SAR within the studied range affected nutrients uptake rather than fresh or dry matter production. | ||||
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