Abstract
Effects of different N/P ratios on several root parameters and on net P uptake were studied in winter wheat, Triticum aestivum cv. Starke II, grown in water culture. In the First experiment N/P ratios of (0/4, 2/3, 4/2, 6/1 and 8/0) were used, and plants were harvested at age 3, 5, 8, 11 and 14 days. In the second experiment N/P ratios of 6/1, 10/1, 15/1, 17/1, 20/1 and 25/1 were applied at two different N,P levels. Root length and number were determined using a digitizer connected to a computer. In the first experiment. the 6/1 N/P ratio gave the largest plants at day 14, and growth decreased with decreasing N/P ratio, The same pattern was found fur lateral root length and root number (seminal and lateral). In the second experiment the root weights decreased with increasing N/P ratio within each level. Lateral root number and overall length decreased with increasing N/P ratio at both levels as did the average lateral root length at the high N,P level. At the low N.P level, average lateral root length was about the same at all N/P ratios. Increasing the N/P ratio increased net uptake of P at the low N,P level, but decreased net P uptake at the high N,P level. Net P uptake increased with increasing P concentration in the roots and then decreased with further increase in P concentration. Net P uptake based on calculated root length [m (g root) −1 ] showed no significant deviation from weight‐based uptake plots. The effect of N and P on root structure is discussed as well as the interaction of N and P in P uptake. The relevance of a proper basis for expressing root activity is stressed.
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Claims 11
Claim · model-written summary
The 6/1 N/P ratio gave the largest plants at day 14.
- Taxon
- winter wheat
Triticum aestivume1 - Material
- Triticum aestivum cv. Starke IIe1
- Treatment
- 6/1 N/P ratioe0
- Outcome
- plantse0
- Direction
- largeste0
- Qualifier
- day 14e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 6/1 N/P ratio gave the largest plants at day 14”
e1“winter wheat, Triticum aestivum cv. Starke II”
Claim · model-written summary
Plant growth decreased with decreasing N/P ratio.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- N/P ratioe0
- Outcome
- growthe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth decreased with decreasing N/P ratio”
e1“winter wheat, Triticum aestivum cv. Starke II”
Claim · model-written summary
Lateral root length and root number followed the same pattern.
- Taxon
- winter wheatTriticum aestivume2
- Treatment
- N/P ratioe1
- Outcome
- lateral root length and root number (seminal and lateral)e0
- Direction
- decreasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The same pattern was found fur lateral root length and root number (seminal and lateral)”
e1“growth decreased with decreasing N/P ratio”
e2“winter wheat, Triticum aestivum cv. Starke II”
Claim · model-written summary
Root weights fell as N/P ratio rose at each supply level.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- N/P ratioe0
- Outcome
- root weightse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the root weights decreased with increasing N/P ratio within each level”
e1“winter wheat, Triticum aestivum cv. Starke II”
Claim · model-written summary
Lateral root number and overall length fell as N/P ratio rose at both levels.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- N/P ratioe0
- Outcome
- Lateral root number and overall lengthe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lateral root number and overall length decreased with increasing N/P ratio at both levels”
e1“winter wheat, Triticum aestivum cv. Starke II”
Claim · model-written summary
Average lateral root length declined with N/P ratio at high nutrient level.
- Taxon
- winter wheatTriticum aestivume2
- Treatment
- N/P ratioe1
- Outcome
- average lateral root lengthe0
- Direction
- decreasede1
- Qualifier
- high N,P levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as did the average lateral root length at the high N,P level”
e1“Lateral root number and overall length decreased with increasing N/P ratio at both levels”
e2“winter wheat, Triticum aestivum cv. Starke II”
Claim · model-written summary
Average lateral root length was similar across N/P ratios at low nutrient level.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- N/P ratiose0
- Outcome
- average lateral root lengthe0
- Direction
- about the samee0
- Qualifier
- low N.P levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the low N.P level, average lateral root length was about the same at all N/P ratios”
e1“winter wheat, Triticum aestivum cv. Starke II”
Claim · model-written summary
Increasing N/P ratio increased net phosphorus uptake at low nutrient level.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- N/P ratioe0
- Outcome
- net uptake of Pe0
- Direction
- increasede0
- Qualifier
- low N,P levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the N/P ratio increased net uptake of P at the low N,P level”
e1“winter wheat, Triticum aestivum cv. Starke II”
Claim · model-written summary
Increasing N/P ratio decreased net phosphorus uptake at high nutrient level.
- Taxon
- winter wheatTriticum aestivume2
- Treatment
- N/P ratioe1
- Outcome
- net P uptakee0
- Direction
- decreasede0
- Qualifier
- high N,P levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased net P uptake at the high N,P level”
e1“Increasing the N/P ratio increased net uptake of P at the low N,P level”
e2“winter wheat, Triticum aestivum cv. Starke II”
Claim · model-written summary
Net phosphorus uptake first increased and then decreased with root phosphorus concentration.
- Taxon
- winter wheatTriticum aestivume1
- Compound
- P concentration in the rootse0
- Outcome
- Net P uptakee0
- Direction
- increased with increasing P concentration in the roots and then decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net P uptake increased with increasing P concentration in the roots and then decreased with further increase in P concentration”
e1“winter wheat, Triticum aestivum cv. Starke II”
Claim · model-written summary
Length-based net phosphorus uptake did not significantly deviate from weight-based plots.
- Taxon
- winter wheatTriticum aestivume1
- Outcome
- Net P uptake based on calculated root lengthe0
- Direction
- no significant deviatione0
- Comparator
- weight‐based uptake plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net P uptake based on calculated root length [m (g root) −1 ] showed no significant deviation from weight‐based uptake plots”
e1“winter wheat, Triticum aestivum cv. Starke II”
The same questions in other papers
nitrogen · growth · Triticum aestivum (wheat)Positive and negative results
425 papers in the same direction as this paper · 116 in the opposite direction · 9 reporting no difference from an alternative
- negative
- negative
- no effect
547 papers more in this group
See all 551 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.