Claim · model-written summary
Weather, soil and husbandry factors poorly explained between-site response differences.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarist0 - Outcome
- little successe0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“attempts to explain them in terms of weather, soil and husbandry factors had little success”
t0“sugar beet”
Title
Nitrogen requirement of sugar beet grown on mineral soils
D. A. Boyd; P. B. H. Tinker; A. P. Draycott; et al. The Journal of Agricultural Science 1970. doi:10.1017/s002185960002092x
Other claims from this paper (13)
- Intervention effect Nitrogen increased sugar yields sharply toward an optimum on most sites.
- Intervention effect Beyond the optimum, sugar yield changed little or decreased slightly through the largest nitrogen rate.
- Intervention effect Mean sugar gain from suboptimal N was 2·5 cwt per 0·1 cwt N per acre.
- Observation Usually 0·4–0·8 cwt N per acre was enough for maximum yield.
- Observation About one fifth of sites needed no nitrogen fertilizer.
- Observation In seven of ten years, mean optimum nitrogen was 0·6–0·8 cwt per acre.
- Observation The driest three years needed less nitrogen.
- Observation Between-site N responses up to 0·9 cwt per acre differed substantially after accounting for experimental error.
- Association Responses to N were slightly diminished following crops other than cereals.
- Association Responses to N were somewhat above average on Hanslope and Stretham Chalky Boulder Clay soils.
- Recommendation The authors recommend 1·0 cwt N per acre as the general sugar beet dressing.
- Recommendation The authors recommend more N on Hanslope and Stretham soils and light sands poor in organic matter.
- Recommendation The authors recommend less N where crop residues supply much nitrogen.