Claim · model-written summary
Urea and ammonium nitrate improved lettuce N, P, and K content relative to ammonium sulphate.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- urea and ammonium nitratee0
- Outcome
- N, P and K contente0
- Direction
- improvede0
- Qualifier
- no considerable differences among them in most casese0
- Comparator
- ammonium sulphatee0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both urea and ammonium nitrate were significantly improved N, P and K content of lettuce plant relative to ammonium sulphate with no considerable differences among them in most cases in the two seasons of study.”
Title
M. Abou El-Nasr, Journal of Plant Production 2002. doi:10.21608/jpp.2002.254724
Other claims from this paper (14)
- Intervention effect Urea and ammonium nitrate increased lettuce growth and yield measures, with little difference between them.
- Intervention effect Ammonium sulphate had the least effect on lettuce growth and yield.
- Intervention effect Increasing potassium from zero to 60 kg K2O/fed. increased lettuce growth and yield, with 60 kg K2O most effective.
- Intervention effect Ammonium nitrate with 60 kg K2O/fed. and urea with 60 kg K2O/fed. were the strongest combinations for lettuce growth and yield.
- Intervention effect Zero potassium combined with any nitrogen source had the least effect on lettuce growth and yield.
- Intervention effect Urea produced the lowest lettuce leaf nitrate content.
- Intervention effect Ammonium nitrate produced the highest lettuce nitrate content in both seasons.
- Intervention effect Lettuce N, P, and K content increased as potassium supply rose from zero to 60 Kg K2O/fed.
- Intervention effect Lettuce nitrate accumulation rose as potassium increased from zero to 40 kg K2O/fed.
- Intervention effect Lettuce nitrate accumulation decreased at the 60 kg potassium level.
- Intervention effect Zero potassium with all nitrogen sources gave the lowest lettuce N, P, K, and nitrate contents.
- Intervention effect Ammonium nitrate or urea with 60 kg K2O/fed. yielded the highest lettuce N, P, and K content.
- Intervention effect Urea with 60 Kg K2O produced low lettuce nitrate content.
- Recommendation The authors recommend urea with 60 kg K2O/fed. for lettuce yield and low leaf nitrate.