Sulphur in New Zealand soils

Metson, A. J.

doi:10.1080/00288233.1979.10420850

Cited by 32 publications

(36 citation statements)

References 124 publications

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“…Fertiliser K had greatest effect on the TPBK values and so K may have been retained by the micaceous clays in non-exchangeable but plant-available forms. This retention is considered to be reversible and therefore beneficial as a future source ofK (Metson 1980). This is of particular importance in these high rainfall conditions (> 1800 mm/year) where leaching losses could be high if there is no mechanism for retention.…”

Section: Soil Analysismentioning

confidence: 99%

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Chemical soil test prediction of pasture responses to potassium on recent soils of the South Island west coast

Williams

Morton²,

Jackson³

1986

New Zealand Journal of Experimental Agriculture

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Section: Soil Analysismentioning

confidence: 99%

“…The recent soils of the west coast of the South Island contain varying amounts of micaceous minerals which are a source of non-exchangeable but plantavailable potassium (K) (Metson 1980). During & Campkin (1980) found in the North Island that this source of K can provide a significant supply to ryegrass pasture.…”

Section: Introductionmentioning

confidence: 99%

Chemical soil test prediction of pasture responses to potassium on recent soils of the South Island west coast

Williams

Morton²,

Jackson³

1986

New Zealand Journal of Experimental Agriculture

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“…By this manner salt precipitants, such as sodium tetraphenyl-boron (Na-TPB), are able to extract fixed K within micaceous minerals, but are less able to remove K from the three-dimensional structures of K-feldspars (Song & Huang 1988). While much K release information has been gained on soils using destructive methods like hot 1M nitric acid (Metson et al 1956;Metson 1980;Surapaneni et al 2002), they have been less favoured because of their severe extraction conditions. Workers have shown the relative rates of K release from micas can be an order of magnitude higher than feldspars at low pH, but that this difference decreases with increasing pH (Sparks & Huang 1985).…”

Section: Introductionmentioning

confidence: 99%

“…These classifications have been used in fertiliser decisionsupport models such as that of Campkin (1985) and AgResearchPKS Lime/Overseer® (Metherell 1999). However, the index has a major shortcoming in that variation between mean K c values for a number of soil classes is often less than that between the individual soil class members (Metson 1980).…”

Section: Introductionmentioning

confidence: 99%

Rates of release of non‐exchangeable potassium in New Zealand soils measured by a modified sodium tetraphenyl‐boron method

Carey

Metherell

2003

New Zealand Journal of Agricultural Research

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A modified sodium tetraphenyl-boron method (Na-TPB), which uses an incubation period and boiling with a copper solution to destroy the tetraphenyl-boron-K precipitate (TBK) instead of shaking and resolubilisation with acetone, is proposed as a replacement for Jackson's TBK method. The method as recommended is 1 g soil in 3 ml of 1.7 M NaCl/0.01 M EDTA solution + 0.2 g Na-TPB and incubated at 20°C for between 1 and 168 h. Testing of the method showed it to be a more rapid, accurate, and cost-effective means of routinely testing soil K reserves than Jackson's test. Correlation of TBK values against Jackson's method were good (r 2 = 0.88) for short extraction times (1-4 h) but decreased with increasing extraction time. Regressions of TBK values with K c values, the current method for differentiating K supplying ability between soils, were only fair (r 2 < 0.75). This was due to mechanistic differences between dissolution (Kc-acid extraction) and solubility based (TBK-precipitation) methods.Potassium release curves were established for a range of 24 New Zealand soils for 1-672 h. The bulk of K release (c. 80%) occurred for most soils within the first 48 h with release rates in significant decline after 168 h. Release curves were modelled using a range of simple kinetic models: empirical Elovich, power, exponential, simplified-Elovich, and parabolic diffusion equations were all examined. The quality of fit for each model tended to decrease in that order, although this varied between soil classes.

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“…However, this analysis takes no account of either the additional losses which are likely through leaching or the possible gains in plant-available K resulting from the release of K from non-exchangeable fractions. While leaching losses may be considerable, the potential gain from the release of non-exchangeable K on this soil type is probably low (Metson 1980 …”

Section: Animal Loss Factormentioning

confidence: 99%

Estimation of potassium losses from a grazed dairy farm in Taranaki

Williams

Roberts²

1988

New Zealand Journal of Experimental Agriculture

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The potassium (K) lost through animal products (milk, calf and culled stock) and transfer of excretal K to the dairy shed and raceways, was estimated at 1.6 kg/stock unit (SU) for a dairy farmlet of small herd size, assuming the cows spend 5070 of the year off the paddock. This loss increased to 2.5 kg K/SU if the cows spend 10070 of the year off the paddock as is likely on a dairy farm with a larger number of cows. These values are lower than the 4 kg K/SU currently used by the Ministry of Agriculture and Fisheries as the animal loss factor (ALF) in their fertiliser advice scheme for dairying on flat-rolling country in New Zealand.

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Sulphur in New Zealand soils

Cited by 32 publications

References 124 publications

Chemical soil test prediction of pasture responses to potassium on recent soils of the South Island west coast

Chemical soil test prediction of pasture responses to potassium on recent soils of the South Island west coast

Rates of release of non‐exchangeable potassium in New Zealand soils measured by a modified sodium tetraphenyl‐boron method

Estimation of potassium losses from a grazed dairy farm in Taranaki

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