Abstract
Abstract Optimum rates for and the residual effects of several new copper fertilizer materials have not been determined. Because the copper in these sources is complexed, usually with an organic ligand, it has been implied that they are more effective than copper sulfate. The immediate and residual effectiveness of copper sulfate and several new chelated and/or complexed copper materials were compared to determine the optimum rate of application for each source. Field experiments were conducted on four acid, organic soils, each of which was severely deficient in copper. Wheat ( Triticum aestivum L.) yields were increased with an increase in the rate applied to 2.8 kg Cu/ha at three locations and to 5.6 kg Cu/ha at the fourth. There was no difference in the nature of the response obtained among sources so all sources were considered equally effective when equivalent amounts of copper were used. Soybeans [ Glycine max (L.) Merr.] were double‐cropped behind wheat to determine the residual effect of these sources. Grain yields showed the same patterns of response to copper sources as were obtained with wheat. Plant analyses also revealed the same effects of copper applications as were obtained with grain yields. Distinct symptoms of copper deficiency developed in the control and low copper treatments in both crops.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Wheat yield increased with copper rate up to 2.8 kg Cu/ha at three sites and 5.6 kg Cu/ha at the fourth.
- Taxon
- Wheat
Triticum aestivume0 - Treatment
- increase in the rate applied to 2.8 kg Cu/hae0
- Outcome
- yieldse0
- Direction
- increasede0
- Value
- 2.8 kg Cu/hae0
- Qualifier
- 5.6 kg Cu/ha at the fourthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat ( Triticum aestivum L.) yields were increased with an increase in the rate applied to 2.8 kg Cu/ha at three locations and to 5.6 kg Cu/ha at the fourth.”
Claim · model-written summary
Copper sources produced the same wheat response at equivalent copper amounts.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- sourcese0
- Outcome
- response obtainede0
- Direction
- no differencee0
- Qualifier
- equivalent amounts of coppere0
- Comparator
- all sourcese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference in the nature of the response obtained among sources so all sources were considered equally effective when equivalent amounts of copper were used.”
t0“Wheat and Soybeans”
Claim · model-written summary
Soybean grain yield followed the same copper-source response pattern as wheat.
- Taxon
- Soybeans
Glycine maxt0 - Treatment
- copper sourcese0
- Outcome
- Grain yieldse0
- Direction
- samee0
- Comparator
- wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields showed the same patterns of response to copper sources as were obtained with wheat.”
t0“Wheat and Soybeans”
Claim · model-written summary
Plant analyses showed the same copper effects as grain yields.
- Taxon
- Wheat and SoybeansGlycine maxTriticum aestivumt0
- Treatment
- copper applicationse0
- Outcome
- Plant analysese0
- Comparator
- grain yieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant analyses also revealed the same effects of copper applications as were obtained with grain yields.”
t0“Wheat and Soybeans”
Claim · model-written summary
Copper deficiency symptoms developed in wheat and soybean controls and low copper treatments.
- Taxon
- Wheat and SoybeansGlycine maxTriticum aestivumt0
- Treatment
- low copper treatmentse0
- Outcome
- symptoms of copper deficiencye0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Distinct symptoms of copper deficiency developed in the control and low copper treatments in both crops.”
t0“Wheat and Soybeans”
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
- negative
- no effect
- no effect
71 papers more in this group
See all 75 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.