Claim · model-written summary
Return on investment declined at 120 kg N/ha per application to 26%.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- 120- and 150 kg N/ha per applicatione0
- Outcome
- ROI [return on investment]e0
- Direction
- declinee0
- Value
- 26e0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“the ROI [return on investment] started to decline at 120- and 150 kg N/ha per application with only 26 and 8%, respectively”
t0“sweet potato”
Title
On-farm fertilizer management for continuous sweet potato herbage supply
S. Gayao; J.S. Luis; W.L. Marquez; et al. 1990
Other claims from this paper (8)
- Intervention effect Nitrogen application increased sweet potato herbage yield relative to control.
- Association Herbage yield rose as nitrogen rates increased.
- Intervention effect Return on investment declined at 150 kg N/ha per application to 8%.
- Recommendation The recommended nitrogen rate after each herbage harvest was 30 kg/ha.
- Intervention effect At 30 kg/ha nitrogen, herbage yield was 34% greater than control.
- Intervention effect At 30 kg/ha nitrogen, return on investment was 14% more than control.
- Recommendation The authors recommended trials at two or more sites in wet and dry seasons.
- Recommendation The authors suggested reducing nitrogen rates and application frequency because herbage yield effects were not significant.