Claim · model-written summary
Use of urea was accompanied by a considerable drop in pH.
Zea maysNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring‐sown maize, marrow‐stem kale. and potatoes, followed by autumn‐sown Italian ryegrass”
e7“the use of urea was accompanied by a considerable drop in exchangeable calcium. base saturation. and pH”
Title
Pasture growth and soil fertility
P. D. Sears; V. D. Goodall; R. H. Jackman New Zealand Journal of Agricultural Research 1965. doi:10.1080/00288233.1965.10419891
Other claims from this paper (9)
- Intervention effect Fertilisers maintained high crop yields over four years.
- Intervention effect Inadequate nitrogen limited production of maize and potatoes after the first year.
- Intervention effect Inadequate nitrogen and possibly sulphur limited kale production after the first year.
- Observation Cropping did not physically deteriorate the soil enough to affect crop growth.
- Intervention effect Soil organic matter decreased at about 5 per cent a year when the soil was kept fallow, to a smaller extent when plants were grown.
- Observation Exchangeable cations decreased significantly.
- Intervention effect Use of urea was accompanied by a considerable drop in exchangeable calcium.
- Intervention effect Use of urea was accompanied by a considerable drop in base saturation.
- Mechanism Discrepancies between nitrogen mineralised and nitrogen used by the crops suggest that losses of available nitrogen occurred.