Abstract
Abstract A number of field and vegetable crops were grown in the field and greenhouse on a peat soil very deficient in copper. Yield responses and copper contents of the plants were determined and copper deficiency symptoms photographed and described. In another series of tests the need for copper by oats on a number of upland soils was determined, and data concerning yield and copper content of the oats are presented. Significant increases in yields of straw were obtained in several cases. In the tests on the peat soil, oats showed the greatest need for copper among field crops and red beets among vegetable crops. Oat yields without copper were slightly over 1 bushel per acre, and with copper 64 bushels. Red beet yields were increased 5‐fold by the application of copper to this soil. Copper contents of plants varied considerably and in general increased with copper fertilization.
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Claims 6
Claim · model-written summary
Copper application raised oat yield to 64 bushels per acre from slightly over 1 bushel per acre without copper.
- Taxon
- oats
Avena sativae3 - Treatment
- coppere4
- Outcome
- Oat yieldse4
- Direction
- increaseinferrede4
- Value
- 64 bushelse4
- Qualifier
- slightly over 1 bushel per acree4
- Comparator
- without coppere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“In the tests on the peat soil, oats showed the greatest need for copper among field crops and red beets among vegetable crops”
e4“Oat yields without copper were slightly over 1 bushel per acre, and with copper 64 bushels”
Claim · model-written summary
Application of copper increased red beet yields 5-fold on this peat soil.
Not reportedComparator
Verbatim
e5“Red beet yields were increased 5‐fold by the application of copper to this soil”
Claim · model-written summary
Copper contents of plants increased with copper fertilization.
- Taxon
- plantsViridiplantaee6
- Treatment
- copper fertilizatione6
- Outcome
- Copper contentse6
- Direction
- increasede6
Verbatim
e6“Copper contents of plants varied considerably and in general increased with copper fertilization”
Claim · model-written summary
Oats had the greatest need for copper among field crops.
- Taxon
- oatsAvena sativae3
- Outcome
- need for coppere3
- Qualifier
- among field cropse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“In the tests on the peat soil, oats showed the greatest need for copper among field crops and red beets among vegetable crops”
Claim · model-written summary
Red beets had the greatest need for copper among vegetable crops.
Verbatim
e3“In the tests on the peat soil, oats showed the greatest need for copper among field crops and red beets among vegetable crops”
Claim · model-written summary
Significant increases in straw yields were obtained in several cases.
Verbatim
t0“Copper Requirements and Deficiency Symptoms of a Number of Field and Vegetable Crops”
e2“Significant increases in yields of straw were obtained in several cases”
The same questions in other papers
copper atom · yield · Avena sativa (oats)Results differ
4 papers in the same direction as this paper · 2 in the opposite direction · 1 reporting no difference from an alternative
- positive
- no effect
- no effect
4 papers more in this group
See all 8 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.