Claim · model-written summary
Nitrogen fertilizer generally lowered grape soluble solids relative to control, regardless of timing.
- Treatment
- N fertilizere0
- Outcome
- soluble solidse0
- Direction
- decreasede0
- Qualifier
- irrespective of timinge0
- Comparator
- C0e0
VitisNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Generally, N fertilizer decreased soluble solids over C0, irrespective of timing”
t0“Grapevines”
Title
L. Peter Christensen; Mary L. Bianchi; William L. Peacock; et al. American Journal of Enology and Viticulture 1994. doi:10.5344/ajev.1994.45.4.377
Other claims from this paper (17)
- Observation Grenache had the high extreme and Barbera the low extreme of petiole total inorganic nitrogen status and nitrogen treatment responsiveness.
- Observation French Colombard and Chenin blanc had intermediate petiole nitrogen status and responsiveness.
- Intervention effect Petiole total inorganic nitrogen status generally increased as fertilizer nitrogen rate increased.
- Intervention effect More recent nitrogen applications often gave higher petiole nitrogen status at the next sampling.
- Intervention effect Postharvest and budbreak applications had higher petiole nitrogen status at bloom.
- Intervention effect Fruit-set nitrogen application yielded higher petiole nitrogen status at veraison.
- Intervention effect Postharvest nitrogen sometimes produced bloom petiole nitrogen status comparable to double-rate budbreak application in all four cultivars.
- Intervention effect Postharvest nitrogen gave higher bloom petiole nitrogen status than budbreak application in Grenache, French Colombard and Chenin blanc.
- Observation Petiole nitrate nitrogen was more sensitive to fertilizer treatment than ammonium nitrogen.
- Association Nitrate nitrogen contributed more to total inorganic nitrogen and correlated more strongly with it than ammonium nitrogen.
- Recommendation The authors questioned using ammonium nitrogen as an additional nitrogen-status measure.
- Observation Grape soluble solids were the fruit parameter most responsive to nitrogen treatment.
- Intervention effect The highest nitrogen rate produced the largest decrease in grape soluble solids.
- Intervention effect In Grenache, all nitrogen treatments except veraison application raised grape yield relative to control.
- Intervention effect Grape yields in cultivars other than Grenache were not affected by nitrogen treatments.
- Recommendation Veraison nitrogen application had other negative effects and was judged the least desirable timing.
- Observation Timing effects on other fruit parameters were minor.