Reclamation of a calcareous saline-sodic soil using phosphoric acid and by-product gypsum

Phosphoric acid is increasingly used as a source of water-soluble P, but it has not been widely tested for its effectiveness in reclaiming calcareous sodic and saline-sodic soils relative to chemically equivalent rates of gypsum. In lysimeters experiments, we showed that a calcareous saline-sodic so...

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Bibliographic Details
Published in:Soil use and management 2010-06, Vol.26 (2), p.141-148
Main Authors: Gharaibeh, M.A, Eltaif, N.I, Shra'ah, S.H
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
hydraulic conductivity
phosphogypsum
phosphoric acid
reclamation
SAR
Sodic soil
Soil science
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Summary:Phosphoric acid is increasingly used as a source of water-soluble P, but it has not been widely tested for its effectiveness in reclaiming calcareous sodic and saline-sodic soils relative to chemically equivalent rates of gypsum. In lysimeters experiments, we showed that a calcareous saline-sodic soil can be 'reclaimed' using phosphoric acid and leaching with moderately saline irrigation water (sodium adsorption ratio = 4.1 and electrical conductivity = 2.2 dS/m). Phosphoric acid (50% pure) was dissolved directly in the leaching water at application rates of 450, 600 and 900 kg/ha, and phosphogypsum (80% pure) was mixed with soil prior to leaching at application rates of 15, 20, 30 and 40 t/ha. Phosphoric acid was more efficient than the chemical equivalent of phosphogypsum in improving soil hydraulic conductivity, and in reducing the exchangeable sodium percentage (ESP). The ESPs after leaching were: 10 (water only), 5.5-5.3 (phosphoric acid) and 8.2-5.9 (phosphogypsum).
ISSN:0266-0032
1475-2743
DOI:10.1111/j.1475-2743.2010.00260.x