Claim · model-written summary
Nitrate or urea alone generally produced the highest calcium concentration, followed by mixed nitrate and ammonium, then ammonium alone.
- Treatment
- NO − 3 or urea as the sole source of Ne0
- Outcome
- Ca concentrationse0
- Direction
- higheste0
- Qualifier
- 1:1 NO − 3 /NH + 4e0
- Comparator
- NH + 4 onlye0
SorghumNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants grown with NO − 3 or urea as the sole source of N generally had the best growth and the highest Ca concentrations, followed by plants grown with 1:1 NO − 3 /NH + 4 , and NH + 4 only, respectively”
t0“Sorghum”
Title
H. M. Murtadha; J. W. Maranville; R. B. Clark Agronomy Journal 1988. doi:10.2134/agronj1988.00021962008000010027x
Other claims from this paper (13)
- Intervention effect High ammonium and low calcium caused calcium deficiency symptoms on young sorghum leaves, unlike nitrate alone or urea.
- Intervention effect Solution pH was higher with nitrate as the predominant nitrogen source.
- Intervention effect Growth decreased with more ammonium and less calcium.
- Intervention effect Plant calcium concentrations decreased with more ammonium and less calcium.
- Intervention effect Total plant nitrogen concentration increased with more ammonium and less calcium.
- Association Plant nitrogen to calcium ratios increased as solution ammonium proportion increased.
- Association Increasing nitrogen to calcium ratios corresponded to more severe leaf calcium deficiency.
- Observation Lower leaves had higher calcium concentrations than upper leaves.
- Intervention effect Nitrate or urea alone generally produced the best growth, followed by mixed nitrate and ammonium, then ammonium alone.
- Intervention effect Dry matter yield increased with solution calcium across nitrogen sources.
- Mechanism The authors propose that enhanced calcium uptake with nitrate alone partly maintains cation and anion balance.
- Mechanism The authors suggest that lower solution pH under high ammonium may reduce calcium absorption or release calcium from cell walls.
- Mechanism The authors suggest abnormal root growth under high ammonium may worsen calcium deficiency by reducing uptake.