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D. W. Cowling & A. W. Bristow (1979). Effects of SO2 on sulphur and nitrogen fractions and on free amino acids in perennial ryegrass. Journal of the Science of Food and Agriculture 30, 354–360.
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K. W. M. Davy & C. J. O. R. Morris (1977). Applications of gas–liquid chromatography in protein chemistry. II. Determination of amide residues in nanomolar amounts of proteins. Journal of Chromatography 136, 361–369.
L. E. Ensminger (1954). Some factors affecting the adsorption of sulphate by Alabama soils. Soil Science Society of America Proceedings 18, 259–264.
W. Eppendorfer (1968). The effects of nitrogen and sulphur on changes in nitrogen fractions of barley plants at various early stages of growth and on yield and amino acid composition of grain. Plant and Soil 29, 424–438.
M. A. Gilbert & A. D. Robson (1984). Sulphur nutrition of temperate pasture species. I. Effects of nitrogen supply on the external and internal sulfur requirements of subterranean clover and ryegrass. Australian Journal of Agricultural Research 35, 379–380.
C. M. Johnson & H. Nishita (1952). Micro-estimation of sulphur in plant materials, soils and irrigation waters. Analytical Chemistry 24, 736–742.
M. B. Jones , V. V. Rendig , D. T. Torell & T. S. Inouye (1982). Forage quality for sheep and chemical composition associated with sulfur fertilization on a sulfur deficient site. Agronomy Journal 74, 775–780.
N. M. Scott , M. E. Watson , K. S. Caldwell & R. H. E. Inkson (1983). Response of grassland to the application of sulphur at two sites in the northeast of Scotland. Journal of the Science of Food and Agriculture 34, 354–361.