Abstract
Abstract The objective of this investigation was to determine by means of greenhouse experiment the influence of application of boron, magnesium, and potassium on the yield and chemical composition of red clover grown on Kansas soils. A factoral design of greenhouse experiment in which a single rate of application of boron, magnesium, and potassium was made to each of four soil materials was used for the growth of red clover. Yield data were collected for four clippings of plant material. Chemical analyses were made for phosphorus, potassium, magnesium, and boron. Applications of potassium to the soil always increased the potassium content of the red clover plants and significantly the total yield of red clover for each soil type. Approximately 1% potassium in the plant material was the critical lower limit for this element, insofar as growth response was concerned. Boron applications increased the boron content of the plant material regularly and considerably. A critical lower limit of about 28 to 30 ppm B in red clover plant material was established as being necessary for prevention of boron deficiency. Cherokee subsoil was more deficient in boron than any of the surface soil samples used in this study. Magnesium applications to the soil were generally effective in increasing magnesium concentrations in the plant material only when potassium was not included as a part of the chemical treatment. A critical lower limit of about 0.5% magnesium in red clover plant material was required for optimum growth. A definite positive correlation was established between percent phosphorus and percent magnesium in the plant material. The mean value was 0.535. This correlation was most marked on soils which had low magnesium activity as indicated by relatively low percentage magnesium saturation on the exchange complex. A definite negative correlation between percentage composition of potassium and percentage composition magnesium was established. The mean value was 0.683. Potassium was shown to exert control over magnesium and not vice versa.
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Claims 11
Claim · model-written summary
Potassium application increased red clover potassium content.
- Taxon
- red clover
Trifolium pratensee0 - Treatment
- Applications of potassium to the soile0
- Outcome
- potassium contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications of potassium to the soil always increased the potassium content of the red clover plants”
Claim · model-written summary
Potassium application significantly increased total red clover yield for every soil type.
- Taxon
- red cloverTrifolium pratensee0
- Treatment
- Applications of potassium to the soile0
- Outcome
- total yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications of potassium to the soil always increased the potassium content of the red clover plants and significantly the total yield of red clover for each soil type.”
Claim · model-written summary
About 1% plant potassium was identified as the critical lower limit for growth response.
- Taxon
- red cloverTrifolium pratenset0
- Outcome
- critical lower limite0
- Value
- Approximately 1% potassiume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Approximately 1% potassium in the plant material was the critical lower limit for this element, insofar as growth response was concerned.”
t0“Red Clover”
Claim · model-written summary
Boron application increased boron content in plant material.
- Taxon
- Red CloverTrifolium pratenset0
- Treatment
- Boron applicationse0
- Outcome
- boron contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Boron applications increased the boron content of the plant material regularly and considerably.”
t0“Red Clover”
Claim · model-written summary
The critical lower boron limit for preventing deficiency was about 28 to 30 ppm in red clover material.
- Taxon
- red cloverTrifolium pratensee0
- Outcome
- critical lower limite0
- Value
- about 28 to 30 ppm Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A critical lower limit of about 28 to 30 ppm B in red clover plant material was established as being necessary for prevention of boron deficiency.”
Claim · model-written summary
Cherokee subsoil was more boron deficient than the surface soils.
- Taxon
- Red CloverTrifolium pratenset0
- Outcome
- more deficient in borone0
- Comparator
- surface soil samplese0
- Setting
- Cherokee subsoile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cherokee subsoil was more deficient in boron than any of the surface soil samples used in this study.”
t0“Red Clover”
Claim · model-written summary
Magnesium application generally increased plant magnesium only without potassium treatment.
- Taxon
- Red CloverTrifolium pratenset0
- Treatment
- Magnesium applications to the soile0
- Outcome
- magnesium concentrationse0
- Direction
- increasinge0
- Qualifier
- only when potassium was not included as a part of the chemical treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Magnesium applications to the soil were generally effective in increasing magnesium concentrations in the plant material only when potassium was not included as a part of the chemical treatment.”
t0“Red Clover”
Claim · model-written summary
About 0.5% magnesium was the lower limit for optimal red clover growth.
- Taxon
- red cloverTrifolium pratensee0
- Outcome
- critical lower limite0
- Value
- about 0.5% magnesiume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A critical lower limit of about 0.5% magnesium in red clover plant material was required for optimum growth.”
Claim · model-written summary
Plant phosphorus and magnesium percentages were positively correlated, with reported mean 0.535.
- Taxon
- Red CloverTrifolium pratenset0
- Compound
- percent magnesiume0
- Outcome
- percent phosphoruse0
- Direction
- positive correlatione0
- Value
- 0.535e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A definite positive correlation was established between percent phosphorus and percent magnesium in the plant material. The mean value was 0.535.”
t0“Red Clover”
Claim · model-written summary
Plant potassium and magnesium percentages were negatively correlated, with reported mean 0.683.
- Taxon
- Red CloverTrifolium pratenset0
- Compound
- percentage composition of potassiume0
- Outcome
- percentage composition magnesiume0
- Direction
- negative correlatione0
- Value
- 0.683e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A definite negative correlation between percentage composition of potassium and percentage composition magnesium was established. The mean value was 0.683.”
t0“Red Clover”
Claim · model-written summary
The authors concluded that potassium controls magnesium rather than the reverse.
- Taxon
- Red CloverTrifolium pratenset0
- Compound
- Potassiume0
- Outcome
- magnesiume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium was shown to exert control over magnesium and not vice versa.”
t0“Red Clover”
The same questions in other papers
boron atom · nutrient: content · Trifolium pratense (red clover)Positive and negative results
1 in the opposite direction
- negative
potassium · yield · Trifolium pratense (red clover)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
4 papers more in this group
See all 8 papers →potassium · nutrient: content · Trifolium pratense (red clover)Results agree
1 paper in the same direction as this paper
- positive
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.