Abstract
Abstract Upland pastures on coarse‐textured sulphur (S)‐deficient soils in moderate to high rainfall areas may benefit from S fertilization using elemental S to avoid leaching losses. Two grades of elemental S, 120 and 300 mesh, were assessed as a source of S for grass and clover. In laboratory incubations using an upland soil at 7 and 14°C, oxidation of the 120 mesh S was very slow while 65% of the 300 mesh S was oxidized after 48 days at 14°C. In pot trials of ryegrass in a lowland soil and of ryegrass and clover in the upland soil both elemental S grades gave satisfactory yield increases which were not significantly different from applying potassium sulphate. High ambient temperatures during the pot experiment probably ensured an adequate oxidation rate of both elemental S grades. High application rates of the potassium sulphate gave rise to luxury consumption while very high rates of elemental S (equivalent to 200 kg S ha‐1) showed some toxicity. Application of a previously‐described model of S oxidation confirmed the importance of soil temperature in controlling S oxidation rates.
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Claims 7
Claim · model-written summary
The 120 mesh elemental sulphur oxidized very slowly in laboratory incubations.
Verbatim
t0“sulphur source for grass and clover”
e1“In laboratory incubations using an upland soil at 7 and 14°C, oxidation of the 120 mesh S was very slow while 65% of the 300 mesh S was oxidized after 48 days at 14°C”
Claim · model-written summary
About 65% of the 300 mesh elemental sulphur was oxidized after 48 days at 14°C in laboratory incubations.
Verbatim
t0“sulphur source for grass and clover”
e1“In laboratory incubations using an upland soil at 7 and 14°C, oxidation of the 120 mesh S was very slow while 65% of the 300 mesh S was oxidized after 48 days at 14°C”
Claim · model-written summary
Both elemental sulphur grades gave yield increases in pot trials not significantly different from potassium sulphate.
Verbatim
t0“sulphur source for grass and clover”
e2“In pot trials of ryegrass in a lowland soil and of ryegrass and clover in the upland soil both elemental S grades gave satisfactory yield increases which were not significantly different from applying potassium sulphate”
Claim · model-written summary
High application rates of potassium sulphate gave rise to luxury consumption.
Verbatim
t0“sulphur source for grass and clover”
e3“High application rates of the potassium sulphate gave rise to luxury consumption”
Claim · model-written summary
Very high rates of elemental sulphur showed some toxicity.
Verbatim
t0“sulphur source for grass and clover”
e4“very high rates of elemental S”
e5“showed some toxicity”
Claim · model-written summary
A previously described model of S oxidation confirmed the importance of soil temperature in controlling S oxidation rates.
Verbatim
t0“sulphur source for grass and clover”
e6“confirmed the importance of soil temperature in controlling S oxidation rates”
Claim · model-written summary
High ambient temperatures during the pot experiment probably ensured an adequate oxidation rate of both elemental S grades.
Verbatim
t0“sulphur source for grass and clover”
e7“High ambient temperatures during the pot experiment probably ensured an adequate oxidation rate of both elemental S grades”