Effects of nitrogen and sulphur fertilisers on the yield, N and S content, and amino acid composition of the grain of spring wheat

Byers, M.; Bolton, J.

Journal of the Science of Food and Agriculture 30(3): 251-263

1979


ISSN/ISBN: 0022-5142
PMID: 459435
DOI: 10.1002/jsfa.2740300308
Accession: 000648071

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Abstract
Spring wheat cv. Kleiber was grown in 3 pot experiments in soil containing 10 mg/kg KH2PO4-soluble S with different rates of N and S fertilizers. Without added S the yields of grain DM and CP were either unchanged (glasshouse experiment) or significantly decreased by the N treatments (controlled environment experiments). With added S, the N fertilizer increased yields by 40-110%. The experiments produced grain with a wide range of N and S contents, the latter ranging from 0.06-0.21% on a DM basis. Grain from treatments giving the largest yields of DM and CP had a N:S ratio of about 15. The amino acid composition of the whole grain was changed significantly by the fertilizer treatments. When plants were grown without added S at the highest level of N the grain contained less than half the amount of cyst(e)ine and methionine (as % of total amino acid content) found in grain from plants given adequate amounts of S fertilizer. Grain from S-deficient plants also had a much greater content of aspartic acid + asparagine but less threonine, leucine, isoleucine and lysine. The N:S ratio in grain from plants grown with insufficient S was well in excess of 15. The relation of these findings to the nutritive value of wheat as a feed and to the provision of enough disulphide bonding capacity for its use in bread-making are discussed. The results emphasized the necessity for having an adequate amount of S to balance the larger N applications now given to wheat to ensure that the grain is of the highest quality possible.

Effects of nitrogen and sulphur fertilisers on the yield, N and S content, and amino acid composition of the grain of spring wheat