Abstract
Summary Four field experiments (1968–71) investigated the effect of changing the length of the growing period on the nitrogen fertilizer requirement of sugar beet. The crop was sown on three occasions (March–May), harvested on three occasions (September–December) and given four amounts of fertilizer (0–225 kg N/ha). Plant samples were analysed at several stages of growth (1969–71) in an attempt to predict the amount of nitrogen fertilizer needed for maximum sugar yield and also at the end of the season to determine the nitrogen uptake. Increasing the length of the growing period increased sugar yield greatly but the amount of nitrogen fertilizer needed for maximum sugar yield was unchanged. The crop given the largest dressing of nitrogen and with the longest growing period contained most total nitrogen, but in every experiment, giving more than 75 kg N/ha neither increased nor decreased the sugar yield significantly. As a result of the small variations in nitrogen requirement, the plant analyses during the growing season were of little value in predicting the needs of the crop.
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Claims 5
Claim · model-written summary
Longer growing periods greatly increased sugar beet sugar yield.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarist0 - Treatment
- Increasing the length of the growing periode0
- Outcome
- sugar yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the length of the growing period increased sugar yield greatly”
t0“sugar beet”
Claim · model-written summary
Longer growing periods did not change the fertilizer amount needed for maximum sugar yield.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- length of the growing periode1
- Outcome
- amount of nitrogen fertilizer needed for maximum sugar yielde0
- Direction
- unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of nitrogen fertilizer needed for maximum sugar yield was unchanged”
t0“sugar beet”
e1“Increasing the length of the growing period”
Claim · model-written summary
The highest nitrogen dressing with the longest growing period produced the greatest total plant nitrogen.
- Taxon
- The crope0
- Treatment
- largest dressing of nitrogen and with the longest growing periode0
- Outcome
- total nitrogene0
- Direction
- moste0
Not reportedComparator
Verbatim
e0“The crop given the largest dressing of nitrogen and with the longest growing period contained most total nitrogen”
Claim · model-written summary
In every experiment, nitrogen above 75 kg N/ha did not significantly increase or decrease sugar yield.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- more than 75 kg N/hae0
- Outcome
- sugar yielde0
- Direction
- neither increased nor decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in every experiment, giving more than 75 kg N/ha neither increased nor decreased the sugar yield significantly”
t0“sugar beet”
Claim · model-written summary
Plant analyses during the growing season had little predictive value for sugar beet nitrogen requirements.
Verbatim
e0“the plant analyses during the growing season were of little value in predicting the needs of the crop”
The same questions in other papers
nitrogen · quality: sugar starch · Beta vulgaris (beet)Results differ
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See all 31 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.