Abstract
Sulphur may become deficient in intensive vegetable production systems that rely on chemical fertilizers. Yield of cole crops in response to sulphur fertilization has not been evaluated under Ontario conditions. Since calcium is linked to clubroot disease and tipburn, the sulphur fertilizer source is an important consideration. Rates of sulphur and calcium were compared for effects on yield using Novacal (a prilled calcium sulphate product), calcium nitrate and potassium sulphate for 3 yr for cabbage and 2 yr for broccoli on both sand and loam soils. There appeared to be no difference in yield from fertilizer source of sulphur or calcium. Applications of sulphur increased yield of Huron late storage cabbage averaged over years and soil with a mathematical maximum occurring at 55 kg S ha -1 . Soil tests indicated levels of approximately 13–19 µg g -1 for sulphur prior to treatment. Yield of cabbage increased proportionately to calcium application averaged over 3 yr. No effect of treatment was observed on broccoli. Thus, soil levels of sulphur were probably limiting for late cabbage but not for broccoli. Sulphur shortage or deficiency appears to exist for late storage cabbage grown in Ontario. Lack of response of broccoli and no calibrated soil test for either element suggest that crops have to be evaluated individually under field conditions for sulphur fertilizer requirements. Key words: Cabbage, broccoli, calcium, sulphur, nutrition, yield
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Claims 6
Claim · model-written summary
Sulphur or calcium fertilizer source made no apparent yield difference.
- Taxon
- cabbage and broccoli
Brassica oleracea var. capitata
Brassica oleracea var. italicat0 - Treatment
- fertilizer source of sulphur or calciume0
- Outcome
- yielde0
- Direction
- no differencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There appeared to be no difference in yield from fertilizer source of sulphur or calcium.”
t0“cabbage and broccoli”
Claim · model-written summary
Sulphur application increased Huron late storage cabbage yield, with a mathematical maximum at 55 kg S ha -1.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Material
- Huron late storage cabbagee0
- Treatment
- Applications of sulphure0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 55 kg S ha -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications of sulphur increased yield of Huron late storage cabbage averaged over years and soil with a mathematical maximum occurring at 55 kg S ha -1 .”
Claim · model-written summary
Cabbage yield increased proportionately with calcium application over three years.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- calcium applicatione0
- Outcome
- Yielde0
- Direction
- increased proportionatelye0
- Qualifier
- averaged over 3 yre0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield of cabbage increased proportionately to calcium application averaged over 3 yr.”
Claim · model-written summary
Treatment had no observed effect on broccoli.
- Taxon
- broccoliBrassica oleracea var. italicae0
- Treatment
- treatmente0
- Outcome
- broccolie0
- Direction
- No effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No effect of treatment was observed on broccoli.”
Claim · model-written summary
The authors concluded sulphur was probably limiting for late cabbage, but not broccoli.
Verbatim
e0“Thus, soil levels of sulphur were probably limiting for late cabbage but not for broccoli.”
Claim · model-written summary
The authors recommend individual field evaluation of crops for sulphur fertilizer requirements.
Verbatim
e0“crops have to be evaluated individually under field conditions for sulphur fertilizer requirements.”
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sulfur atom · yield · Brassica oleracea (wild cabbage)Results differ
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See all 496 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.