Abstract
The Interaction between potassium and moisture during the growth of and nutrient uptake by rapeseed plants grown on K-deficient soils has been investigated in this Study. The results show that the dry weight of the above-ground parts of the plant appears to be somewhat reduced when the volume water content of the soil remains 0.15 for 3 successive days. As the shortage in the soil water continues, the height of the plant root and the permeability of the root plasmalemma are markedly affected; the stem thickness and leaf area are reduced. However, K application can increase the dry matter weight of the above-ground parts, the thickness of the stem, and the area of the leaf. Application of K can also maintain a comparatively low water potential(ψ) and a comparatively high moisture content in the leaves, thus increasing the drought-resisting ability of the plant. When the volume water content of the soil is raised to 0.30, leaf yellowing as a symptom of nutrient deficiency appears on rapeseed plants grown on K-deficient soils. With increase in soil moisture content, the Ca concentration of the aerial parts of the rapeseed plant without K application increases while the K concentration decreases. Both K application and the soil moisture regime have very little effect on the Mg concentration in the plant. Under soil moisture stress, the nitrogen content and total amount of alnino acids in rape leaves increases; and thus more proline and glutamic acid is formed. On the other hand, the impact of soil moisture on plant's dry matter is governed by the status of potassium nutrition. On soils with low K, the moisture content has very little effect on yield; when K fertilizer is applied, however, the moisture content shows a very significant effect on yield increase.
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Claims 13
Claim · model-written summary
Aboveground dry weight was somewhat reduced after three days at 0.15 soil water content.
- Taxon
- rapeseed plantse1
- Treatment
- volume water content of the soil remains 0.15 for 3 successive dayse0
- Outcome
- dry weight of the above-ground partse0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“dry weight of the above-ground parts of the plant appears to be somewhat reduced when the volume water content of the soil remains 0.15 for 3 successive days”
e1“rapeseed plants grown on K-deficient soils has been investigated in this Study”
Claim · model-written summary
Continued water shortage markedly affected root height and root plasmalemma permeability.
- Taxon
- rapeseed plantse1
- Treatment
- shortage in the soil watere0
- Outcome
- height of the plant root and the permeability of the root plasmalemmae0
- Direction
- markedly affectede0
Not reportedComparator
Verbatim
e0“As the shortage in the soil water continues, the height of the plant root and the permeability of the root plasmalemma are markedly affected”
e1“rapeseed plants grown on K-deficient soils has been investigated in this Study”
Claim · model-written summary
Potassium increased aboveground dry matter weight, stem thickness and leaf area.
- Taxon
- rapeseed plantse1
- Treatment
- K applicatione0
- Outcome
- dry matter weight of the above-ground parts, the thickness of the stem, and the area of the leafe0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“K application can increase the dry matter weight of the above-ground parts, the thickness of the stem, and the area of the leaf”
e1“rapeseed plants grown on K-deficient soils has been investigated in this Study”
Claim · model-written summary
Potassium maintained relatively low leaf water potential and high leaf moisture content.
- Taxon
- rapeseed plantse1
- Treatment
- Application of Ke0
- Outcome
- water potential(ψ) and a comparatively high moisture content in the leavese0
- Direction
- maintaine0
Not reportedComparator
Verbatim
e0“Application of K can also maintain a comparatively low water potential(ψ) and a comparatively high moisture content in the leaves”
e1“rapeseed plants grown on K-deficient soils has been investigated in this Study”
Claim · model-written summary
The authors attribute increased drought resistance to potassium-maintained leaf water status.
Verbatim
e0“Application of K can also maintain a comparatively low water potential(ψ) and a comparatively high moisture content in the leaves, thus increasing the drought-resisting ability of the plant”
e1“rapeseed plants grown on K-deficient soils has been investigated in this Study”
Claim · model-written summary
At 0.30 soil water content, leaf yellowing appeared in rapeseed on potassium-deficient soil.
- Taxon
- rapeseed plantse0
- Treatment
- volume water content of the soil is raised to 0.30e0
- Outcome
- leaf yellowinge0
- Direction
- appearse0
- Qualifier
- K-deficient soilse0
Not reportedComparator
Verbatim
e0“When the volume water content of the soil is raised to 0.30, leaf yellowing as a symptom of nutrient deficiency appears on rapeseed plants grown on K-deficient soils”
Claim · model-written summary
With higher soil moisture, aerial calcium concentration increased without potassium application.
Verbatim
e0“With increase in soil moisture content, the Ca concentration of the aerial parts of the rapeseed plant without K application increases”
Claim · model-written summary
With higher soil moisture, aerial potassium concentration decreased without potassium application.
Verbatim
e0“With increase in soil moisture content, the Ca concentration of the aerial parts of the rapeseed plant without K application increases while the K concentration decreases”
Claim · model-written summary
Potassium application and moisture regime had very little effect on plant magnesium concentration.
- Taxon
- rapeseed plantse1
- Treatment
- K application and the soil moisture regimee0
- Outcome
- Mg concentration in the plante0
- Direction
- very little effecte0
Not reportedComparator
Verbatim
e0“Both K application and the soil moisture regime have very little effect on the Mg concentration in the plant”
e1“rapeseed plants grown on K-deficient soils has been investigated in this Study”
Claim · model-written summary
Moisture stress increased nitrogen and total amino acids in rape leaves.
- Taxon
- rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Treatment
- soil moisture stresse0
- Outcome
- nitrogen content and total amount of alnino acids in rape leavese0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Under soil moisture stress, the nitrogen content and total amount of alnino acids in rape leaves increases”
Claim · model-written summary
Moisture stress led to more proline and glutamic acid formation in rape leaves.
- Taxon
- rapeBrassica napuse0
- Treatment
- soil moisture stresse0
- Outcome
- proline and glutamic acide0
- Direction
- moree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under soil moisture stress, the nitrogen content and total amount of alnino acids in rape leaves increases; and thus more proline and glutamic acid is formed”
Claim · model-written summary
On low-potassium soil, moisture content had very little effect on yield.
Verbatim
e0“On soils with low K, the moisture content has very little effect on yield”
e1“rapeseed plants grown on K-deficient soils has been investigated in this Study”
Claim · model-written summary
With potassium fertilizer, moisture content had a very significant effect on yield increase.
Verbatim
e0“when K fertilizer is applied, however, the moisture content shows a very significant effect on yield increase”
e1“rapeseed plants grown on K-deficient soils has been investigated in this Study”
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See all 13 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.