Growth, evapotranspiration, and nitrogen leaching from young lysimeter-grown orange trees
Identifieur interne : 002460 ( Main/Exploration ); précédent : 002459; suivant : 002461Growth, evapotranspiration, and nitrogen leaching from young lysimeter-grown orange trees
Auteurs : Brian J. Boman [États-Unis] ; Anwar M. Battikhi [États-Unis]Source :
- Journal of irrigation and drainage engineering [ 0733-9437 ] ; 2007.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Irrigation, Aménagement hydraulique, Azote.
English descriptors
- KwdEn :
Abstract
Lysimeters constructed from polyethylene tanks were filled with Oldsmar fine sand soil. A single "Midsweet" orange on Carrizo citrange rootstock tree was planted in each lysimeter on May 5, 1991. Fertilization treatments included traditional fertilization using applications of dry-soluble fertilizer at 6-week intervals (TF), weekly fertigation applications (WF), and single annual applications of two different controlled-release materials (CR). Irrigation (by microsprinklers) and drainage volumes (collected weekly) were measured with totalizing flow meters. Trees fertilized with CR products achieved equivalent growth to trees on the TF and WF treatments, even though the CR treatment trees received only 44% of N as the other treatments. The fertigated trees averaged about 14% greater evapotranspiration (ET) during the period of study as compared to the nonfertigated trees. As the trees grew, the average ET increased from 2.8 and 2.3 mm day-1 during 1991/1992 for the fertigated and nonfertigated treatments, respectively, to 5.0 and 4.4 mm day-1, respectively, during 1993/1994. The percentage of the applied N leached ranged from 35% for the WF treatment to 53% with the TF treatment. The total N leached (NO3-N and NH4-N) with the WF trees was approximately two times greater than that for the CR treatments. TF applications resulted in approximately two and one-half times more N leached than from the CR materials. More than 65% of the total N was leached during the rainy summer months (June-November). Leaching was found to be directly related to the rainfall rate.
Affiliations:
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Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Citrus sinensis</term>
<term>Evapotranspiration</term>
<term>Irrigation</term>
<term>Leaching</term>
<term>Lysimeter</term>
<term>Nitrogen</term>
<term>Water engineering</term>
<term>Water quality</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Evapotranspiration</term>
<term>Lessivage</term>
<term>Lysimètre</term>
<term>Irrigation</term>
<term>Qualité eau</term>
<term>Aménagement hydraulique</term>
<term>Citrus sinensis</term>
<term>Azote</term>
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<front><div type="abstract" xml:lang="en">Lysimeters constructed from polyethylene tanks were filled with Oldsmar fine sand soil. A single "Midsweet" orange on Carrizo citrange rootstock tree was planted in each lysimeter on May 5, 1991. Fertilization treatments included traditional fertilization using applications of dry-soluble fertilizer at 6-week intervals (TF), weekly fertigation applications (WF), and single annual applications of two different controlled-release materials (CR). Irrigation (by microsprinklers) and drainage volumes (collected weekly) were measured with totalizing flow meters. Trees fertilized with CR products achieved equivalent growth to trees on the TF and WF treatments, even though the CR treatment trees received only 44% of N as the other treatments. The fertigated trees averaged about 14% greater evapotranspiration (ET) during the period of study as compared to the nonfertigated trees. As the trees grew, the average ET increased from 2.8 and 2.3 mm day<sup>-1</sup>
during 1991/1992 for the fertigated and nonfertigated treatments, respectively, to 5.0 and 4.4 mm day<sup>-1</sup>
, respectively, during 1993/1994. The percentage of the applied N leached ranged from 35% for the WF treatment to 53% with the TF treatment. The total N leached (NO<sub>3</sub>
-N and NH<sub>4</sub>
-N) with the WF trees was approximately two times greater than that for the CR treatments. TF applications resulted in approximately two and one-half times more N leached than from the CR materials. More than 65% of the total N was leached during the rainy summer months (June-November). Leaching was found to be directly related to the rainfall rate.</div>
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<name sortKey="Battikhi, Anwar M" sort="Battikhi, Anwar M" uniqKey="Battikhi A" first="Anwar M." last="Battikhi">Anwar M. Battikhi</name>
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