Claim · model-written summary
Foliar potassium supplemented soil potassium and increased cotton yields when extractable potassium was medium or lower.
- Taxon
- Cotton
Gossypium hirsutumt0 - Treatment
- foliar Ke0
- Outcome
- yieldse0
- Direction
- increasede0
- Qualifier
- when extractable K was medium or lowere0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For this soil, foliar K supplemented soil K 2 O rates and increased yields when extractable K was medium or lower.”
t0“Cotton”
Title
Potassium Fertilization of Cotton Produced on a Low K Soil with Contrasting Tillage Systems
D. D. Howard; C. O. Gwathmey; R. K. Roberts; et al. jpa 1998. doi:10.2134/jpa1998.0074
Other claims from this paper (14)
- Intervention effect Extractable soil potassium increased linearly with soil potassium application in both tillage systems each year.
- Intervention effect Soil-applied potassium increased cotton yields in both tillage systems.
- Intervention effect Foliar potassium increased cotton yields in both tillage systems.
- Method / resource Yield regressions against potassium rate were developed for foliar KNO3 and no-foliar-K treatments each year in both tillage systems.
- Intervention effect Foliar KNO3 increased yields at all soil potassium rates in 1991 and 1992.
- Intervention effect In 1993, foliar KNO3 increased conventional-tillage yields at soil potassium rates up to 94 lb K2O/acre.
- Intervention effect In 1993, foliar KNO3 increased no-tillage yields at soil potassium rates up to 103 lb K2O/acre.
- Intervention effect Foliar KNO3 increased 1994 no-tillage cotton yields at soil potassium rates up to 108 lb K2O/acre.
- Observation Calculated critical soil extractable potassium levels for predicting foliar-potassium yield response ranged from 158 to 161 lb K/acre.
- Observation Petiole potassium indicated cotton potassium deficiency at all rates in 1991 and 1992.
- Observation Cotton potassium was deficient in 1993 at potassium rates of 60 lb/acre or less.
- Observation Cotton potassium was sufficient at 120 lb/acre in 1993.
- Recommendation Foliar potassium may increase cotton yields on medium and low testing soils even with 120 lb K2O/acre fertilization.
- Recommendation A cotton yield response to foliar potassium is unlikely above 160 lb/acre Mehlich I extractable potassium.