Phosphate equilibria in arable soils different in soil type and management

Wada, Kōji

doi:10.1080/00380768.1964.10431133

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“…The applied chemicals were selected as model compounds of phosphorus in soils bonded to Ca, AI, or Fe, that is, two calcium phosphates, CaHP0 4 ·2H z O, with a relatively higher, and Ca 3 (P0 4 )Z, with a lower solubility in water; aluminum and iron phosphates as amorphous forms (Nanzyo 1989), AIP0 4 and FeP0 4 • 2H z O; crystalline forms (Wada 1964), variscite and strengite; and phytates as the major organic P forms in soils (Daral 1977) bonded to Ca, AI, or Fe, respectively. When CaHP0 4 ·2H z O or Ca 3 (P0 4 )Z was applied, the amount of P recovered in the Ca-P i fraction with the Sekiya method was about 25% in the Tsukuba, 40% in the Naruko, and 80% in the Ishigaki soils, respectively (Fig.…”

Section: Soil Chemical Propertiesmentioning

confidence: 99%

The status of inorganic and organic phosphorus in some soils in relation to plant availability

Otani

1997

Soil Science and Plant Nutrition

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Pigeonpea, groundnut, and upland rice are able to take up sparingly soluble phosphorus (P) in low fertility soils. We examined the P forms present in the upland soils in order to study the P uptake mechanisms of these plants. The Chang and Jackson (CJ) fractionation method is commonly applied for determining the P status in soils. In Japan, the Sekiya method has been developed for Andosols. Three acid soils were fractionated according to the two methods, and the contents of both organic and inorganic P in the calcium-, aluminum-, and iron-fractions were determined. In this experiment, a shift of extracted P into the next fraction during the fractionation procedure occurred in both methods. Similar results were obtained with both the CJ and Sekiya methods in a non-allophanic Andosol and a Yellow soil. However, the CJ method overestimated the content of both organic and inorganic P in the calcium-bound fraction, compared to the Sekiya method in the case of an allophanic Andosol. The fractionation using the Sekiya method seemed to give better information than the CJ method about the P status in Japanese upland soils, especially Andosols, in terms of plant P availability.

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Section: Soil Chemical Propertiesmentioning

confidence: 99%

The status of inorganic and organic phosphorus in some soils in relation to plant availability

Otani

1997

Soil Science and Plant Nutrition

View full text Add to dashboard Cite

show abstract

Phosphate equilibria in arable soils different in soil type and management

Cited by 1 publication

References 23 publications

The status of inorganic and organic phosphorus in some soils in relation to plant availability

The status of inorganic and organic phosphorus in some soils in relation to plant availability

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