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The effects of sulphur fertilisers on the content of sulpho‐amino acids in seeds of cowpea ( Vigna unguiculata )
Author(s) -
Evans I. Marta,
Boulter Donald,
Fox Robert L.,
Kang B. T.
Publication year - 1977
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740280209
Subject(s) - vigna , sulfur , cultivar , nitrogen , yield (engineering) , agronomy , chemistry , field experiment , horticulture , amino acid , biology , materials science , organic chemistry , metallurgy , biochemistry
Seed meals of three cowpea ( Vigna unguiculata ) cultivars, grown in pots containing sulphur‐deficient soil supplemented with 0, 0.2, 0.6, 1.8, 5, 15 and 45 parts/10 6 sulphate‐S levels in the soil solution, were examined for total nitrogen, total sulphur and sulpho‐amino acid contents. The sulphur content and the ratio of sulphur to nitrogen were found to increase with the increasing level of sulphate‐S fertilisation up to ca 5 parts/10 6 . Compared with the control the sulpho‐amino acid content in seeds of cowpea TVu 76 increased with S‐supplementation up to 5 parts/10 6 and that of cowpea Sitao Pole increased with S up to 1.8 parts/10 6 . Similar levels (7 and 2 parts/10 6 respectively) of sulphate‐S were required in the soil solution to obtain 95% of the maximum yields of cowpea seeds. The content of sulpho‐amino acids in the seeds from 5 parts/10 6 treatments were similar to those reported for cowpeas grown under field conditions at IITA and elsewhere with adequate levels of soil sulphur for maximum yield.