| Titles |
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English :
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Behavior of selenium in a calcareous soil treated with humic acid
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Arabic :
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سلوك عنصر السيلينيوم فى الأراضى الجيرية المعاملة بحامض الهيوميك
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| Abstract |
During winter of 2005-2006 a greenhouse experiment was conducted using a surface calcareous soil (0 –20 cm) as growth medium for faba bean (Vicia faba; c.v. Giza 2) to study the behaviour of selenium (Se) in calcareous soils treated with humic acid (H.A). The humic acid was applied, before sowing and moistened at field capacity with distilled water for two weeks, at rates of 0, 100, 250, 500 and 1000 mg kg-1 soil. Selenium was added at rates of 0, 1, 2, 4 and 8 mg kg-1 soil as sodium selenate (Na2SeO4). Increasing selenium levels decreased the dry matter yield; and showed a negative correlation with the dry matter yield of bean plants. H.A increased dry matter production, and showed positive correlation with the yield. Se resulted in a positive significant increase in Se concentration in plant, while H.A decreased it. Se-uptake by bean plants was progressively increased with increasing rate of Se addition. It was slightly affected with increasing rates of humic acid application. S-concentration and its uptake by bean plants decreased with increasing selenium application and its rate. Humic acid decreased S-concentration and in some cases increase S-uptake particularly under conditions of high Se rates. Se decrease N-concentration and uptake by plant, particularly where the rate was 4 mg Se kg-1 soil. However, HA increased N-concentration and uptake. Tissue P-concentration of bean plants was decreased by 22% as the selenium addition reached 8 mg kg-1 soil, but was slightly decreased with increasing humic acid rate. There was no clear trend for p-uptake by bean plants with humic acid. K-concentration increased by adding Se at 4mg kg-1; and K-uptake decreased with Se addition. Humic acid addition increased potassium concentration and uptake by bean plants. The N2-ase activity of bean plants was increased with increasing the levels of selenium and humic acid addition. The number and dry weight of nodules were positively affected with adding selenium and humic acid. Increasing selenium levels up to 2 mg kg-1 soil increased CO2-evolution from the soil then decreased it up to 8 mg kg-1 soil, CO2-evolution increased gradually with increasing humic acid application rate
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| Publication year |
2006
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| Pages |
407-424
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| Availability location |
Soils, Water and Environment Research Institute, ARC
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| Availability number |
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| Organization Name |
Soil, Water and Environment Research Institute (SWERI)
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| Country |
Egypt
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| City |
Benha
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| Publisher |
Name:
Faculty Of Agriculture, Moshtohor, Benha University
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| serial title |
Annals Of Agricultural Science, Moshtohor
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| ISSN |
1110-0419
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| Volume |
44
. 1
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| Department |
Soil Physics and Chemistry
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| Author(s) from ARC |
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| Agris Categories |
Soil chemistry and physicsSoil fertility
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AGROVOC
TERMS |
Calcareous soils.
Humic acids.
Selenium.
Vicia faba.
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| Publication Type |
Journal
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