Abstract
S ummary The potential effects of acid rain on the availability of soil nutrients were examined by growing sorghum and peanut seedlings in a loamy sand/perlite mixture such that nutrient availability limited growth. Seedlings were watered with simulated acid precipitation at pH 5.5 (control), 4.5, 3.5, and 2.5 for 28 or 31 d. There was a significant increase in growth rate and plant dry weight for seedlings exposed to subambient (pH 2.5) watering regimes containing both SO 4 2− and NO 3− (6:1, mol/mol). When NO 3− was omitted there was no enhancement of shoot growth, and root growth was approximately 50% of that in the control (pH 55) seedlings. Peanut and sorghum seedlings were also grown in soil amended with AlCl 3 to simulate conditions where acid precipitation depresses soil pH to the Al neutralization range. Under these conditions there was a complete cessation of growth which was attributed primarily to inhibition of uptake and translocation of Ca rather than accumulation of Al in plant tissues. These experiments indicate that input of N but not S from acid precipitation may potentially benefit crop plants and forage grasses growing under low nutrient availability. Al mobilization in acidified soils may affect plant growth through the induction of Ca deficiency.
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Claims 5
Claim · model-written summary
Acid precipitation at pH 2.5 containing sulfate and nitrate significantly increased seedling growth rate and dry weight.
- Taxon
- PEANUT AND SORGHUMt0
- Treatment
- subambient (pH 2.5) watering regimes containing both SO 4 2− and NO 3− (6:1, mol/mol)e0
- Outcome
- growth rate and plant dry weighte0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“There was a significant increase in growth rate and plant dry weight for seedlings exposed to subambient (pH 2.5) watering regimes containing both SO 4 2− and NO 3− (6:1, mol/mol).”
t0“PEANUT AND SORGHUM”
Claim · model-written summary
Omitting nitrate removed the shoot growth enhancement.
Not reportedComparator
Verbatim
e0“When NO 3− was omitted there was no enhancement of shoot growth”
t0“PEANUT AND SORGHUM”
Claim · model-written summary
With nitrate omitted, root growth was approximately 50% of control.
- Taxon
- PEANUT AND SORGHUMt0
- Treatment
- NO 3− was omittede1
- Outcome
- root growthe0
- Value
- approximately 50%e0
- Comparator
- control (pH 55) seedlingse0
Not reportedDirection
Verbatim
e0“root growth was approximately 50% of that in the control (pH 55) seedlings”
e1“When NO 3− was omitted”
t0“PEANUT AND SORGHUM”
Claim · model-written summary
AlCl3 amended soil completely stopped peanut and sorghum seedling growth.
- Taxon
- Peanut and sorghum
Arachis hypogaea
Sorghume0 - Treatment
- soil amended with AlCl 3e0
- Outcome
- growthe0
- Direction
- complete cessatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Peanut and sorghum seedlings were also grown in soil amended with AlCl 3 to simulate conditions where acid precipitation depresses soil pH to the Al neutralization range. Under these conditions there was a complete cessation of growth”
Claim · model-written summary
Growth cessation under aluminium amendment was attributed primarily to inhibited calcium uptake and translocation.
- Taxon
- Peanut and sorghumArachis hypogaeaSorghume1
- Compound
- Cae0
- Outcome
- growthe0
- Qualifier
- inhibition of uptake and translocation of Cae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a complete cessation of growth which was attributed primarily to inhibition of uptake and translocation of Ca rather than accumulation of Al in plant tissues”
e1“Peanut and sorghum seedlings”
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