Chemical and mineralogical properties and soil solution composition of acid soils from the South Pacific Islands

Naidu, Ravi; Haynes, R. J.; Gawandar, J. S.; Morrison, R.J.; Fitzpatrick, R. W.

doi:10.1007/978-94-011-3438-5_5

Cited by 11 publications

(5 citation statements)

References 25 publications

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“…Faleula and Saleimoa silty clay soils having higher K contents proved better than the naturally acidic clay and alkaline calcareous sandy soils. Other two soils were poor in K, support the early findings by Blakemore (1973) and Naidu et al (1990) who reported that K deficiency is common in most Samoa soils including Samoan acidic soils. Formation and development in sweetpotato storage root are influenced largely by potassium (O'Sullivan et al, 1997) that was largely evident with higher yield of sweetpotato at both Faleula and Saleimoa soils.…”

Section: Sweetpotato Yieldsupporting

confidence: 86%

Performance of improved sweetpotato (Ipomoea batatas L.) cultivars under different soil types of Samoa

Siose¹,

Guinto²

2017

S. Pac. J. Nat. App. Sci.

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Section: Sweetpotato Yieldsupporting

confidence: 86%

Performance of improved sweetpotato (Ipomoea batatas L.) cultivars under different soil types of Samoa

Siose¹,

Guinto²

2017

S. Pac. J. Nat. App. Sci.

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“…Similarly the chemical composition and ionic strength of soil solution will vary depending on the nature of the parent material, the weathering environment, mineral constituents, soil amendments and management practices. Ionic strength of soil solution ranges from <0.005 M in the soils from tropics (Gillman & Bell, 1976;Curtin eta/., 1991;Naidu et al, 1991) to > 0.10 M in the less weathered soils from temperate climates (Edmeades et al, 1985) or near fertilizer granules.…”

Section: Introductionmentioning

confidence: 99%

Ionic‐strength and pH effects on the sorption of cadmium and the surface charge of soils

Naidu¹,

Bolan²,

Kookana³

et al. 1994

European J Soil Science

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489

168

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Two Oxisols (Mena and Malanda), a Xeralf and a Xerert from Australia and an Andept (Patua) and a Fragiaqualf (Tokomaru) from New Zealand were used to examine the effect of pH and ionic strength on the surface charge of soil and sorption of cadmium. Adsorption of Cd was measured using water, 0.01 mol dmp3 Ca(NO&, and various concentrations of NaN03 (0.01-1.5 mol dm-3) as background solutions at a range of pH values (3)(4)(5)(6)(7)(8).In all soils, the net surface charge decreased with an increase in pH. The pH at which the net surface charge was zero (point of net zero charge, PZC) differed between the soils. The PZC was higher for soils dominated by variable-charge components (Oxisols and Andept) than soils dominated by permanent charge (Xeralf, Xerert and Fragiaqualf). For all soils, the adsorption of Cd increased with an increase in pH and most of the variation in adsorption with pH was explained by the variation in negative surface charge. The effect of ionic strength on Cd adsorption varied between the soils and with the pH. In Oxisols, which are dominated by variable-charge components, there was a characteristic pH below which increasing ionic strength of NaN03 increased Cd adsorption and above which the reverse occurred. In all the soils in the normal pH range (i.e. pH > PZC), the adsorption of Cd always decreased with an increase in ionic strength irrespective of pH. If increasing ionic strength decreases cation adsorption, then the potential in the plane of adsorption is negative. Also, if increasing ionic strength increases adsorption below the PZC, then the potential in the plane of adsorption must be positive. These observations suggest that, depending upon the pH and PZC, Cd is adsorbed when potential in the plane of adsorption is either positive or negative providing evidence for both specific and non-specific adsorption of Cd. Adsorption of Cd was approximately doubled when Na rather than Ca was used as the index cation.

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“…The mean Olsen available phosphorous was 0.87 mg/kg; classified very low as per Blakemore et al (1987). Low phosphorous levels have also been detected by Curtin et al (1991), Naidu et al (1991), Goundar et al (2014) and Nisha and Prasad (2020) in soils of Fiji. The paradigm of phosphorous limitation (Dalling et al 2016) suggests that phosphorus is the most important limiting nutrient in lowland tropical rainforests with the largest pool of plant available phosphorous actually present in biomass (Turner and Engelbrecht 2011, Yang et al 2016, Nasto et al 2017.…”

Section: Discussionmentioning

confidence: 98%

Impacts of Tropical Rainforest Conversion on Soil Nutrient Pools in Viti Levu, Fiji

Shah,

Sharma

2023

Pacific Science

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Chemical and mineralogical properties and soil solution composition of acid soils from the South Pacific Islands

Cited by 11 publications

References 25 publications

Performance of improved sweetpotato (Ipomoea batatas L.) cultivars under different soil types of Samoa

Performance of improved sweetpotato (Ipomoea batatas L.) cultivars under different soil types of Samoa

Ionic‐strength and pH effects on the sorption of cadmium and the surface charge of soils

Impacts of Tropical Rainforest Conversion on Soil Nutrient Pools in Viti Levu, Fiji

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