Abstract
SUMMARY The effects of different rates of N fertilizer (0–180 kg N/ha) were tested on the growth, yield and processing quality of sugarbeet in 34 field experiments in England between 1986 and 1988. The experiments were performed using soil types, locations and management systems that were representative of the commercial beet crop in the UK. The responses obtained showed that current recommendations for N fertilizer use are broadly correct, but large differences occurred on some soil types, in some years, between the recommended amounts and the experimentally determined optima for yield. The divergence was largest when organic manures had been applied in the autumn before the beet crop. Calculations using a simple nitrate-leaching model showed that much of the N in the manures was likely to be leached, the extent of leaching being much less if the manure application was delayed until spring. In these circumstances, spring measurement of inorganic mineral N in the soil could improve fertilizer recommendations. In situations where higher than optimum rates of fertilizer N were used, the extra N had little effect on yield. Increasing the rate from 0 to 180 kg N/ha increased the amount of nitrate left in the soil at harvest by only 8 kg N/ha. The amount of inorganic N released into the soil from crop residues at harvest increased by 50 kg N/ha with N application rate, and the fate of this N has not been established.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Current nitrogen fertilizer recommendations were broadly correct.
- Taxon
- sugarbeet
Beta vulgaris subsp. vulgarist0 - Outcome
- recommendations for N fertilizer usee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugarbeet (Beta vulgaris)”
e0“current recommendations for N fertilizer use are broadly correct”
Claim · model-written summary
Recommended and experimental yield-optimal nitrogen rates differed greatly on some soils and years.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarist0
- Outcome
- differencese0
- Direction
- largee0
- Qualifier
- on some soil types, in some yearse0
- Comparator
- recommended amountse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugarbeet (Beta vulgaris)”
e0“large differences occurred on some soil types, in some years, between the recommended amounts and the experimentally determined optima for yield”
Claim · model-written summary
The divergence was greatest after autumn organic manure.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- organic manurese0
- Outcome
- divergencee0
- Direction
- largeste0
- Qualifier
- in the autumne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugarbeet (Beta vulgaris)”
e0“The divergence was largest when organic manures had been applied in the autumn before the beet crop.”
Claim · model-written summary
The model found much manure nitrogen likely to leach.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarist0
- Outcome
- N in the manures was likely to be leachede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugarbeet (Beta vulgaris)”
e0“Calculations using a simple nitrate-leaching model showed that much of the N in the manures was likely to be leached”
Claim · model-written summary
Delaying manure until spring greatly reduced modeled nitrogen leaching.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- manure application was delayed until springe0
- Outcome
- extent of leachinge0
- Direction
- much lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugarbeet (Beta vulgaris)”
e0“the extent of leaching being much less if the manure application was delayed until spring”
Claim · model-written summary
Spring soil inorganic nitrogen measurement could improve fertilizer recommendations.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarist0
- Outcome
- spring measurement of inorganic mineral N in the soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugarbeet (Beta vulgaris)”
e0“spring measurement of inorganic mineral N in the soil could improve fertilizer recommendations”
Claim · model-written summary
Fertilizer nitrogen above the optimum had little yield effect.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- higher than optimum rates of fertilizer Ne0
- Outcome
- yielde0
- Direction
- little effecte0
- Comparator
- optimum ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugarbeet (Beta vulgaris)”
e0“higher than optimum rates of fertilizer N were used, the extra N had little effect on yield”
Claim · model-written summary
Raising fertilizer nitrogen from zero to 180 kg/ha increased harvest soil nitrate by 8 kg/ha.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- 180 kg N/hae0
- Outcome
- amount of nitrate left in the soil at harveste0
- Direction
- increasede0
- Value
- 8 kg N/hae0
- Comparator
- 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugarbeet (Beta vulgaris)”
e0“Increasing the rate from 0 to 180 kg N/ha increased the amount of nitrate left in the soil at harvest by only 8 kg N/ha.”
Claim · model-written summary
Nitrogen application increased crop-residue inorganic nitrogen release by 50 kg/ha.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- N application ratee0
- Outcome
- amount of inorganic N released into the soil from crop residues at harveste0
- Direction
- increasede0
- Value
- 50 kg N/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugarbeet (Beta vulgaris)”
e0“The amount of inorganic N released into the soil from crop residues at harvest increased by 50 kg N/ha with N application rate”
The same questions in other papers
fertilization · yield · Beta vulgaris (beet)Positive and negative results
29 papers in the same direction as this paper · 237 in the opposite direction
- positive
- positive
- positive
263 papers more in this group
See all 267 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.