Abstract
Abstract To demonstrate the effect of nitrogen application at various growth stages on the tuber yield of the potato plant (Solarium tuberosum L. cv. Danshakuimo), the partial production efficiency of nitrogen absorbed (PPE(N)) during growth and the effect of nitrogen topdressing were examined, and the results obtained were as follows. 1. PPE(N) decreased rapidly after the lowering stage, because, when nitrogen was applied continuously after the lowering stage, the number and one-tuber weight of the primary-1st order tubers did not increase.2. Nitrogen topdressing after the flowering stage adversely affected the tuber yield, particularly when nitrogen was applied near harvest. This phenomenon was ascribed to the fact that the number of tubers was almost constant and tne one-tuber weight decreased. In contrast, when nitrogen was applied before the lowering stage, since the number of tubers decreased and one-tuber weight increased with growth until the flowering stage, the yield was not affected. It was eventually concluded that nitrogen application during the tuber swelling stage did not affect or exerted a negative effect on the increase of the tuber yield because the photosynthetic rate did not increase by nitrogen application.
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Claims 10
Claim · model-written summary
Partial production efficiency of absorbed nitrogen fell rapidly after the lowering stage.
- Taxon
- potato plant
Solanum tuberosumt0 - Outcome
- PPE(N)e0
- Direction
- decreased rapidlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PPE(N) decreased rapidly after the lowering stage”
t0“Production efficiency of nitrogen absorbed by-potato plant at various growth stages”
Claim · model-written summary
Continuous nitrogen after the lowering stage did not increase primary first-order tuber number or one-tuber weight.
- Taxon
- potato plantSolanum tuberosumt0
- Treatment
- nitrogen was applied continuously after the lowering stagee0
- Outcome
- number and one-tuber weight of the primary-1st order tuberse0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when nitrogen was applied continuously after the lowering stage, the number and one-tuber weight of the primary-1st order tubers did not increase”
t0“Production efficiency of nitrogen absorbed by-potato plant at various growth stages”
Claim · model-written summary
Nitrogen topdressing after flowering adversely affected tuber yield, especially near harvest.
- Taxon
- potato plantSolanum tuberosumt0
- Treatment
- Nitrogen topdressing after the flowering stagee0
- Outcome
- tuber yielde0
- Direction
- adversely affectede0
- Qualifier
- particularly when nitrogen was applied near harveste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen topdressing after the flowering stage adversely affected the tuber yield, particularly when nitrogen was applied near harvest”
t0“Production efficiency of nitrogen absorbed by-potato plant at various growth stages”
Claim · model-written summary
With nitrogen after flowering, tuber number was nearly constant.
- Taxon
- potato plantSolanum tuberosumt0
- Outcome
- number of tuberse0
- Direction
- almost constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of tubers was almost constant”
t0“Production efficiency of nitrogen absorbed by-potato plant at various growth stages”
Claim · model-written summary
With nitrogen after flowering, one-tuber weight decreased.
- Taxon
- potato plantSolanum tuberosumt0
- Outcome
- one-tuber weighte0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tne one-tuber weight decreased”
t0“Production efficiency of nitrogen absorbed by-potato plant at various growth stages”
Claim · model-written summary
Nitrogen before the lowering stage did not affect yield.
- Taxon
- potato plantSolanum tuberosumt0
- Treatment
- nitrogen was applied before the lowering stagee0
- Outcome
- yielde0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when nitrogen was applied before the lowering stage, since the number of tubers decreased and one-tuber weight increased with growth until the flowering stage, the yield was not affected”
t0“Production efficiency of nitrogen absorbed by-potato plant at various growth stages”
Claim · model-written summary
Tuber number decreased with growth until flowering following earlier nitrogen application.
- Taxon
- potato plantSolanum tuberosumt0
- Outcome
- number of tuberse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of tubers decreased and one-tuber weight increased with growth until the flowering stage”
t0“Production efficiency of nitrogen absorbed by-potato plant at various growth stages”
Claim · model-written summary
One-tuber weight increased with growth until flowering following earlier nitrogen application.
- Taxon
- potato plantSolanum tuberosumt0
- Outcome
- one-tuber weighte0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of tubers decreased and one-tuber weight increased with growth until the flowering stage”
t0“Production efficiency of nitrogen absorbed by-potato plant at various growth stages”
Claim · model-written summary
Nitrogen application did not raise photosynthetic rate during tuber swelling.
- Taxon
- potato plantSolanum tuberosumt0
- Treatment
- nitrogen applicatione0
- Outcome
- photosynthetic ratee0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic rate did not increase by nitrogen application”
t0“Production efficiency of nitrogen absorbed by-potato plant at various growth stages”
Claim · model-written summary
Authors concluded nitrogen during tuber swelling did not improve and could reduce the rise in yield.
- Taxon
- potato plantSolanum tuberosumt0
- Treatment
- nitrogen application during the tuber swelling stagee0
- Outcome
- increase of the tuber yielde0
- Direction
- did not affect or exerted a negative effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen application during the tuber swelling stage did not affect or exerted a negative effect on the increase of the tuber yield”
t0“Production efficiency of nitrogen absorbed by-potato plant at various growth stages”
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