Abstract
SUMMARY The effects of N, P, K and Na silicate fertilizers, and drought on the concentrations of K in the dry matter and tissue water of field-grown spring barley crops have been investigated. Percentage K in dry matter depended on the amounts of N, P, K or water received by the crops and was linearly related to fresh weight to dry weight ratio, but the slope of this relationship depended on whether or not the crops received K. Expressing K concentrations on the basis of tissue water eliminated differences between crops, except for those given insufficient K. Barley crops given fertilizer K maintained K concentrations in their tissue water of about 200 mmol/kg tissue water for most of the growth period but crops grown without K had only 50–70 mmol/kg tissue water. The results indicate that K concentrations in the tissue water are a more reliable indicator of tissue K status than % K in dry matter. Decreases in crop K content resulting from poor K supply were balanced by increases in Na and Ca (but not Mg) contents so that total cation concentrations in the tissue water were similar in low and high K crops. The extra Na and Ca are probably primarily involved in maintaining charge balance for anion absorption but once in the plant they may also substitute for K in its osmotic role.
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Claims 10
Claim · model-written summary
Barley dry-matter potassium percentage depended on N, P, K and water supply.
- Taxon
- spring barley
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Hordeum vulgaret0 - Treatment
- amounts of N, P, K or watere0
- Outcome
- Percentage K in dry mattere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Percentage K in dry matter depended on the amounts of N, P, K or water received by the crops”
t0“spring barley”
Claim · model-written summary
Dry-matter potassium percentage was linearly related to fresh-to-dry weight ratio, with the slope dependent on K fertilization.
- Taxon
- spring barleyHordeum vulgaret0
- Outcome
- Percentage K in dry mattere1
- Qualifier
- whether or not the crops received Ke0
- Comparator
- fresh weight to dry weight ratioe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was linearly related to fresh weight to dry weight ratio, but the slope of this relationship depended on whether or not the crops received K.”
e1“Percentage K in dry matter”
t0“spring barley”
Claim · model-written summary
Expressing potassium on a tissue-water basis eliminated differences between barley crops except those given insufficient K.
- Taxon
- spring barleyHordeum vulgaret0
- Outcome
- K concentrations on the basis of tissue watere0
- Direction
- eliminated differencese0
- Qualifier
- except for those given insufficient Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Expressing K concentrations on the basis of tissue water eliminated differences between crops, except for those given insufficient K.”
t0“spring barley”
Claim · model-written summary
Barley supplied fertilizer K maintained about 200 mmol/kg tissue water potassium for most of growth.
- Taxon
- BarleyHordeum vulgaree0
- Outcome
- K concentrations in their tissue watere0
- Value
- about 200 mmol/kg tissue watere0
- Qualifier
- for most of the growth periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Barley crops given fertilizer K maintained K concentrations in their tissue water of about 200 mmol/kg tissue water for most of the growth period”
Claim · model-written summary
Barley without K had only 50–70 mmol/kg tissue water potassium.
- Taxon
- spring barleyHordeum vulgaret0
- Treatment
- without Ke0
- Outcome
- K concentrations in their tissue watere1
- Direction
- onlye0
- Value
- 50–70 mmol/kg tissue watere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crops grown without K had only 50–70 mmol/kg tissue water”
e1“Barley crops given fertilizer K maintained K concentrations in their tissue water of about 200 mmol/kg tissue water for most of the growth period”
t0“spring barley”
Claim · model-written summary
Tissue-water potassium concentration was a more reliable indicator of barley K status than dry-matter percentage K.
- Taxon
- spring barleyHordeum vulgaret0
- Outcome
- indicator of tissue K statuse0
- Direction
- more reliablee0
- Comparator
- % K in dry mattere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K concentrations in the tissue water are a more reliable indicator of tissue K status than % K in dry matter.”
t0“spring barley”
Claim · model-written summary
Poor potassium supply decreased barley crop K content.
- Taxon
- spring barleyHordeum vulgaret0
- Treatment
- poor K supplye0
- Outcome
- crop K contente0
- Direction
- Decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreases in crop K content resulting from poor K supply”
t0“spring barley”
Claim · model-written summary
Poor potassium supply increased crop Na and Ca contents.
- Taxon
- spring barleyHordeum vulgaret0
- Treatment
- poor K supplye0
- Outcome
- Na and Ca (but not Mg) contentse0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreases in crop K content resulting from poor K supply were balanced by increases in Na and Ca (but not Mg) contents”
t0“spring barley”
Claim · model-written summary
Total tissue-water cation concentrations were similar between low- and high-K barley crops.
- Taxon
- spring barleyHordeum vulgaret0
- Outcome
- total cation concentrations in the tissue watere0
- Direction
- similare0
- Comparator
- low and high K cropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total cation concentrations in the tissue water were similar in low and high K crops.”
t0“spring barley”
Claim · model-written summary
The authors propose that extra Na and Ca maintain anion absorption charge balance and may substitute for K osmotically.
- Taxon
- spring barleyHordeum vulgaret0
- Compound
- Na and Cae0
- Outcome
- maintaining charge balance for anion absorptione0
- Qualifier
- may also substitute for K in its osmotic rolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extra Na and Ca are probably primarily involved in maintaining charge balance for anion absorption but once in the plant they may also substitute for K in its osmotic role.”
t0“spring barley”
The same questions in other papers
potassium · nutrient: content · Hordeum vulgare (barley)Positive and negative results
5 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
11 papers more in this group
See all 15 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.