Claim · model-written summary
Manure treatments required square and cube terms for nitrogen response fits.
Not reportedTaxonMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentSettingDirectionValueQualifier
Verbatim
e0“Treatments including manure required terms with the square and cube of applied fertilizer N levels to describe the response pattern”
Title
Effects of Corn Stover, Manure, and Nitrogen on Soil Properties and Crop Yield1
J. W. Ketcheson; E. G. Beauchamp Agronomy Journal 1978. doi:10.2134/agronj1978.00021962007000050003x
Other claims from this paper (14)
- Intervention effect Manure without nitrogen fertilizer produced yields comparable with any other treatment.
- Intervention effect Returned stover depressed yields when fertilizer nitrogen was absent.
- Intervention effect With nitrogen fertilizer, returned stover slightly raised yields relative to removal.
- Intervention effect Returning stover did not increase fertilizer nitrogen requirements at normal rates.
- Intervention effect Fertilizer nitrogen narrowed the stover residue carbon to nitrogen ratio.
- Intervention effect Additional nitrogen did not increase total nitrogen in grain or soil.
- Method / resource A square root term for applied nitrogen fit most grain and nitrogen yield responses, except most manure treatments.
- Intervention effect Residual nitrogen yielded more without stover than with stover.
- Observation Soil organic matter declined over the experiment.
- Intervention effect Stover and manure reduced the decline in soil organic matter.
- Intervention effect Applied nitrogen did not conserve soil organic matter.
- Intervention effect Applied nitrogen increased soil inorganic nitrogen.
- Intervention effect Stover and manure increased water stable aggregation.
- Recommendation Annual liquid poultry manure at 112 kg/ha nitrogen removed the need for fertilizer nitrogen.