Abstract
In five field experiments the effect on wheat grain yield of a current application of fertilizer copper mixed with the superphosphate drilled with the seed was compared with the residual effect of fertilizer copper applied the same way 4 to 12 years earlier. In all cases the earlier application was superior, or equal, to the current application. Vegetative copper concentration, measured in two experiments, was increased much more by the original application than by the current application. All applied copper remained in the top 10 cm of soil 4 years after application in a form which could be extracted by 0.2 M ammonium oxalate at pH 3 when measured in one experiment. Reasons for the relative inefficiency of the current application are suggested. The residual effectiveness of fertilizer Cu in the field determined by this method measures the nett effects on Cu availability of processes acting in opposite directions. The processes enhancing Cu availability dominate or counter those processes such as soil 'fixing' reactions which, if present, are obscured.
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Claims 3
Claim · model-written summary
Residual fertilizer copper applied 4 to 12 years earlier gave wheat grain yield superior or equal to a current application.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- fertilizer copper applied the same way 4 to 12 years earliere1
- Outcome
- wheat grain yielde1
- Direction
- superior, or equale2
- Comparator
- current applicatione1
- Setting
- Western Australiat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat in Western Australia”
e1“the effect on wheat grain yield of a current application of fertilizer copper mixed with the superphosphate drilled with the seed was compared with the residual effect of fertilizer copper applied the same way 4 to 12 years earlier”
e2“In all cases the earlier application was superior, or equal, to the current application”
Claim · model-written summary
The original copper application increased vegetative copper concentration much more than the current application.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- original applicatione3
- Outcome
- Vegetative copper concentratione3
- Direction
- increased much moree3
- Comparator
- current applicatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat in Western Australia”
e3“Vegetative copper concentration, measured in two experiments, was increased much more by the original application than by the current application”
Claim · model-written summary
Applied copper remained in the top 10 cm of soil 4 years after application, extractable by 0.2 M ammonium oxalate at pH 3.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- applied copper remained in the top 10 cm of soile4
- Value
- 10 cme4
- Qualifier
- 4 years after applicatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat in Western Australia”
e4“All applied copper remained in the top 10 cm of soil 4 years after application in a form which could be extracted by 0.2 M ammonium oxalate at pH 3 when measured in one experiment”
The same questions in other papers
copper atom · yield · Triticum aestivum (wheat)Results differ
62 papers in the same direction as this paper · 12 in the opposite direction
- no effect
- positive
- positive
71 papers more in this group
See all 75 papers →fertilization · yield · Triticum aestivum (wheat)Positive and negative results
3,114 papers in the same direction as this paper · 284 in the opposite direction · 39 reporting no difference from an alternative
- no effect
- no effect
- negative
3,434 papers more in this group
See all 3,438 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.