A comparison of X‐ray fluorescence spectrometry and chemical methods for determining sulphur in plant material

Bolton, J.; Brown, George E.; Pruden, G.; Williams, Carolyn

doi:10.1002/jsfa.2740240509

Cited by 18 publications

(2 citation statements)

References 11 publications

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“…Grain and straw samples from the pot experiments and grain samples from the field experiment were analysed for nitrogen by Kjeldahl digestion with automated colorimetric determination of the ammonia. Sulphur and copper were determined using X-ray fluorescence speetrometry (Bolton et al 1973) on pressed disk samples of the plant material. Some samples were analysed chemically because only small amounts of dry matter were available.…”

Section: Methodsmentioning

confidence: 99%

Effects of sulphur fertilizers and of copper on the yield and composition of spring wheat grown in an sandy soil prone to surface compaction

Bolton

1975

J. Agric. Sci.

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SUMMARYA condition known as ‘scorch” with symptoms similar to copper deficiency often occurs in dry weather on cereals grown on a sandy soil (at Woburn) with an unstable structure. Plants with symptoms contained more sulphur than normal and sulphur/ copper interactions were suspected.Sulphur fertilizers tested in two pot experiments with this soil did not induce copper deficienciesbut increased grain and straw yields of spring wheat especially at higher nitrogen rates. Yields were increased when the mature grain contained less than 0.12% S and the straw less than 0.5% Sin the dry matter. Sulphur concentrations were larger in plants grown in the greenhouse rather than in growth cabinets and in plants grown in oven-dried rather than air-dried soil.Soil-applied copper sulphate slightly increased grain yields in pots but in one experiment there were no corresponding increases in copper contents of the crop. In a field experiment where ‘scorch’ symptoms occurred in 1972, copper oxychloride sprays increased copper concentrations but not yields of the grain.These results suggest that copper deficiency is unlikely to be a primary cause of ‘scorch’ symptoms.

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Section: Methodsmentioning

confidence: 99%

Effects of sulphur fertilizers and of copper on the yield and composition of spring wheat grown in an sandy soil prone to surface compaction

Bolton

1975

J. Agric. Sci.

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“…Some advantages of this technique are that samples are not destroyed, samples do not require digestion, procedures require less manpower (11,20), and results relate well with many other well established mineral element analysis procedures (2,12,15,21). Determinations of S have especially been adapted to XRF procedures because most other methods have required extensive digestion and laborious techniques (9,13,14,20), and different forms of S like sulfate and S-amino acids can be determined (10,13,17,18).…”

Section: Introductionmentioning

confidence: 95%

X‐ray fluorescence analysis of small leaf samples mixed with cellulose or boric acid

Clark

Frank

Zaifnejad

et al. 1992

Communications in Soil Science and Plant Analysis

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Chemical methods suitable for screening for protein content and quality in cowpea (Vigna unguiculata) meals

Boulter

1974

J Sci Food Agric

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Several chemical methods have been tested for their suitability as screening procedures for estimation of the protein content and quality of cowpea (Vigna unguiculata) meals.Preliminaryestimates of crude protein can be obtained by the UDY dye-binding procedure, followed by the automated microKjeldah1 (% N x 6.25) method using, for example, Carlo Erba equipment. Total amino acid nitrogen was estimated also with the Carlo Erba apparatus and for the cowpea varieties examined a positive correlation between the total amino acid nitrogen and total nitrogen contents was found. Total sulphur was evaluated as a measure of the sulpho-amino acids in cowpea meals. Total sulphur was determined by wet digestion and subsequent turbidimetric estimation of barium sulphate. Methionine was determined in meal hydrolysates by a Locarte Autoanalyzer. Cysteine was determined either as cysteic acid on the Locarte Autoanalyzer or as bismuth sulphide.The results obtained for cowpea meals showed that there was a relatively small variation in the total sulphur and in the sulpho-amino acid contents. Although the relation between total sulphur and sulpho-amino acids was found to be significant at the 95 % confidence level, the confidence limits were wide and at this stage a definite recommendation cannot be given as to the probable usefulness of the total sulphur-screening procedure. A strong negative correlation was observed between both methionine and sulpho-amino acids/l6 g of N and % crude protein.Similarly, a negative relationship was observed between total sulphur/lb g of N and % crude protein.

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A comparison of X‐ray fluorescence spectrometry and chemical methods for determining sulphur in plant material

Cited by 18 publications

References 11 publications

Effects of sulphur fertilizers and of copper on the yield and composition of spring wheat grown in an sandy soil prone to surface compaction

Effects of sulphur fertilizers and of copper on the yield and composition of spring wheat grown in an sandy soil prone to surface compaction

X‐ray fluorescence analysis of small leaf samples mixed with cellulose or boric acid

Chemical methods suitable for screening for protein content and quality in cowpea (Vigna unguiculata) meals

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