Abstract
Abstract Previous research has indicated that P application may influence plant Mo nutrition, and that both P and Mo are influenced by soil pH. This is of interest, since Mo is deficient in some soils and because large quantities of acidifying nitrogenous fertilizers are commonly applied in production of burley tobacco (Nicotiana tabacum L.). Burley tobacco was grown in two experiments using Maury silt loam soil (Typic Paleudalfs) to determine the influence of soil acidity, form of N applied, and P application on plant growth and mineral nutrition. The studies were conducted in the greenhouse so that high root densities would develop and the data primarily reflect rhizosphere effects. Ammonium application depressed rhizosphere pH 0.4 to 0.6 pH units. Nitrate nutrition raised soil pH less than 0.1 pH unit. Plants supplied NH4 exhibited slower early growth than plants supplied NO3. Several significant interactions involving soil pH, N source, P, and Mo occurred. In the first experiment, plant P was not affected by form of N applied, while in the second experiment NH4 application resulted in higher plant P concentration, both in presence and absence of applied P. Application of NH4 also increased plant weight in the second experiment. Plant P concentration was influenced by pH, being greatest at pH 6.2 and decreasing as pH levels decreased or increased. Plant Mo concentration did not differ among forms of N at pH 5.4, but at pH 7.2 was three times greater in the presence of NO3. When Mo was applied, P addition enhanced plant Mo concentration, but when Mo was not applied, P addition did not increase Mo concentration. This effect of P on Mo occurred only in the presence of N and was greater in the presence of NH4 than NO3. These observations suggest that enhancement of plant Mo nutrition by P application may be dependent on adequate levels of N being present.
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Claims 14
Claim · model-written summary
Ammonium application depressed rhizosphere pH by 0.4 to 0.6 pH units in burley tobacco.
- Taxon
- burley tobaccot0
- Treatment
- Ammonium applicatione2
- Outcome
- rhizosphere pHe2
- Direction
- depressede2
- Value
- 0.4 to 0.6 pH unitse2
- Setting
- greenhousee3
Not reportedComparator
Verbatim
t0“burley tobacco”
e2“Ammonium application depressed rhizosphere pH 0.4 to 0.6 pH units”
e3“The studies were conducted in the greenhouse”
Claim · model-written summary
Nitrate nutrition raised soil pH by less than 0.1 pH unit in burley tobacco.
- Taxon
- burley tobaccot0
- Treatment
- Nitrate nutritione4
- Outcome
- soil pHe4
- Direction
- raisede4
- Value
- less than 0.1 pH unite4
- Setting
- greenhousee3
Not reportedComparator
Verbatim
t0“burley tobacco”
e4“Nitrate nutrition raised soil pH less than 0.1 pH unit”
e3“The studies were conducted in the greenhouse”
Claim · model-written summary
Plants supplied NH4 had slower early growth than plants supplied NO3 in burley tobacco.
Verbatim
t0“burley tobacco”
e5“Plants supplied NH4 exhibited slower early growth than plants supplied NO3”
Claim · model-written summary
Form of N applied did not affect plant P in the first experiment of burley tobacco.
Not reportedComparator
Verbatim
t0“burley tobacco”
e6“In the first experiment, plant P was not affected by form of N applied”
Claim · model-written summary
NH4 application gave higher plant P concentration in the second experiment, with and without applied P, in burley tobacco.
- Taxon
- burley tobaccot0
- Treatment
- NH4 applicatione6
- Outcome
- plant P concentratione6
- Direction
- highere6
- Qualifier
- both in presence and absence of applied Pe6
Not reportedComparator
Verbatim
t0“burley tobacco”
e6“in the second experiment NH4 application resulted in higher plant P concentration, both in presence and absence of applied P”
Claim · model-written summary
Application of NH4 increased plant weight in the second experiment of burley tobacco.
- Taxon
- burley tobaccot0
- Treatment
- Application of NH4e7
- Outcome
- plant weighte7
- Direction
- increasede7
- Qualifier
- in the second experimente7
Not reportedComparator
Verbatim
t0“burley tobacco”
e7“Application of NH4 also increased plant weight in the second experiment”
Claim · model-written summary
Plant P concentration in burley tobacco was influenced by pH and was greatest at pH 6.2.
Verbatim
t0“burley tobacco”
e1“Plant P concentration was influenced by pH, being greatest at pH 6.2 and decreasing as pH levels decreased or increased”
Claim · model-written summary
Plant Mo concentration in burley tobacco did not differ among forms of N at pH 5.4.
Verbatim
t0“burley tobacco”
e1“Plant Mo concentration did not differ among forms of N at pH 5.4”
Claim · model-written summary
At pH 7.2, plant Mo concentration of burley tobacco was three times greater in the presence of NO3.
Verbatim
t0“burley tobacco”
e1“Plant Mo concentration did not differ among forms of N at pH 5.4, but at pH 7.2 was three times greater in the presence of NO3”
Claim · model-written summary
P addition enhanced plant Mo concentration of burley tobacco when Mo was applied.
- Taxon
- burley tobaccot0
- Treatment
- P additione1
- Outcome
- plant Mo concentratione1
- Direction
- enhancede1
- Qualifier
- When Mo was appliede1
Not reportedComparator
Verbatim
t0“burley tobacco”
e1“When Mo was applied, P addition enhanced plant Mo concentration”
Claim · model-written summary
P addition did not increase plant Mo concentration of burley tobacco when Mo was not applied.
- Taxon
- burley tobaccot0
- Treatment
- P additione1
- Outcome
- Mo concentratione1
- Direction
- did not increasee1
- Qualifier
- when Mo was not appliede1
Not reportedComparator
Verbatim
t0“burley tobacco”
e1“but when Mo was not applied, P addition did not increase Mo concentration”
Claim · model-written summary
The effect of P on Mo in burley tobacco occurred only in the presence of N and was greater with NH4 than with NO3.
Verbatim
t0“burley tobacco”
e1“This effect of P on Mo occurred only in the presence of N and was greater in the presence of NH4 than NO3”
Claim · model-written summary
Several significant interactions among soil pH, N source, P and Mo occurred in burley tobacco.
Verbatim
t0“burley tobacco”
e1“Several significant interactions involving soil pH, N source, P, and Mo occurred”
Claim · model-written summary
Enhancement of plant Mo nutrition by P application may depend on adequate levels of N in burley tobacco.
Verbatim
t0“burley tobacco”
e1“enhancement of plant Mo nutrition by P application may be dependent on adequate levels of N being present”
The same questions in other papers
phosphorus · nutrient: content · Nicotiana tabacum (tobacco)Positive and negative results
1 paper in the same direction as this paper · 9 in the opposite direction
- positive
- positive
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7 papers more in this group
See all 11 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.