Abstract
Abstract Sweet potato (Ipomoea batatas L. var. Beniazuma) plants were grown in the field of Hokkaido University where the following treatments: (1) application of nitrogen, phosphorus, and potassium (C plot), (2) absence of nitrogen application (-N plot), (3) absence of phosphorus application (-P plot), and (4) absence of potassium application (-K plot) have been maintained for 76 y. Results obtained were as follows. 1. Under nitrogen deficiency, total dry weight and tuberous root dry weight decreased. Harvest index for dry weight in the -N plot was highest, while the harvest index for nitrogen was the lowest among the treatments, suggesting that high nitrogen use efficiency was achieved in the -N plot.2. Under phosphorus deficiency, total dry weight was the same as that in the C plot, while tuberous root dry weight was strictly restricted, suggesting that the construction of proteins or cellulose in leaves was stimulated, and the construction of starch in tuberous roots was restricted in the -P plot.3. Under potassium deficiency, since nitrogen absorption was not restricted compared with the control, and phosphorus absorption was restricted, the nutritional status of the plants showed a nitrogen excess, suggesting that nitrogen excess and disorder of phloem transport adversely affected the sweet potato growth.
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Claims 12
Claim · model-written summary
Nitrogen deficiency decreased total dry weight.
Not reportedTaxonComparator
Verbatim
e0“Under nitrogen deficiency, total dry weight and tuberous root dry weight decreased”
Claim · model-written summary
Nitrogen deficiency decreased tuberous root dry weight.
Not reportedTaxonComparator
Verbatim
e0“Under nitrogen deficiency, total dry weight and tuberous root dry weight decreased”
Claim · model-written summary
The -N plot had the highest dry-weight harvest index.
Not reportedTaxon
Verbatim
e0“Harvest index for dry weight in the -N plot was highest”
Claim · model-written summary
The -N plot had the lowest nitrogen harvest index.
Not reportedTaxon
Verbatim
e0“the harvest index for nitrogen was the lowest among the treatments”
Claim · model-written summary
Phosphorus deficiency left total dry weight the same as control.
Not reportedTaxon
Verbatim
e0“Under phosphorus deficiency, total dry weight was the same as that in the C plot”
Claim · model-written summary
Phosphorus deficiency restricted tuberous root dry weight.
Not reportedTaxonTreatmentComparator
Verbatim
e0“tuberous root dry weight was strictly restricted”
Claim · model-written summary
The authors suggest phosphorus deficiency stimulated protein or cellulose construction in leaves.
Not reportedTaxon
Verbatim
e0“the construction of proteins or cellulose in leaves was stimulated”
Claim · model-written summary
The authors suggest phosphorus deficiency restricted starch construction in tuberous roots.
Not reportedTaxon
Verbatim
e0“the construction of starch in tuberous roots was restricted in the -P plot”
Claim · model-written summary
Potassium deficiency did not restrict nitrogen absorption.
Not reportedTaxonTreatment
Verbatim
e0“nitrogen absorption was not restricted compared with the control”
Claim · model-written summary
Potassium deficiency restricted phosphorus absorption.
Not reportedTaxonTreatmentComparator
Verbatim
e0“phosphorus absorption was restricted”
Claim · model-written summary
The authors infer a nitrogen-excess nutritional status under potassium deficiency.
Not reportedTaxon
Verbatim
e0“the nutritional status of the plants showed a nitrogen excess”
Claim · model-written summary
The authors suggest nitrogen excess and phloem transport disorder harmed sweet potato growth.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatase0 - Outcome
- sweet potato growthe0
- Qualifier
- nitrogen excess and disorder of phloem transporte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“nitrogen excess and disorder of phloem transport adversely affected the sweet potato growth”