Abstract
Abstract Roots of intact, N‐deficient oat plants proliferated rapidly in contact with both N‐fertilized and unfertilized soils, and recovery in top growth of 10 to 40 mg. of N applied as (NH 4 ) 2 SO 4 ranged from 67 to 38.5% after 7 days. Recovery by whole plants (tops + roots) ranged from 93 to 62%. During the same period, uptake from ureaform was about one‐third that of the soluble sources. No differences in uptake from NaNO 3 , (NH 4 ) 2 SO 4 , and urea in 7 days were found. Since selective absorption of NO 3 ‐ and NH 4 + ions by oat plants was not apparent under the experimental conditions, this crop is regarded as a suitable one for evaluating relative potential availability of N sources and factors influencing N uptake by the short‐term method. N uptake from fertilizer with time described a sigmoid curve. The moisture equivalent was approximately the soil moisture level at which maximum N uptake occurred from Hartsells fine sandy loam and Webster silty clay loam. A highly significant linear correlation (r = 0.98) was found between N content of whole plant and tops based on combined analysis of data obtained with 2 soils, 3 N sources, 3 uptake periods, and 4 levels of N.
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Claims 9
Claim · model-written summary
Oat is a suitable crop for evaluating the relative potential availability of N sources in the short-term uptake method.
- Taxon
- oat
Avena sativae0 - Outcome
- relative potential availability of N sourcese7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants proliferated rapidly in contact with both”
e7“this crop is regarded as a suitable one for evaluating relative potential availability of N sources and factors influencing N uptake”
Claim · model-written summary
N content of whole plant and tops was strongly and significantly correlated across two soils, three N sources, three uptake periods and four N levels.
- Taxon
- oatAvena sativae0
- Treatment
- 2 soils, 3 N sources, 3 uptake periods, and 4 levels of Ne1
- Outcome
- N content of whole plant and topse1
- Value
- r = 0.98e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants proliferated rapidly in contact with both”
e1“A highly significant linear correlation (r = 0.98) was found between N content of whole plant and tops based on combined analysis of data obtained with 2 soils, 3 N sources, 3 uptake periods, and 4 levels of N”
Claim · model-written summary
N uptake from fertilizer followed a sigmoid curve with time in oat.
- Taxon
- oatAvena sativae0
- Outcome
- N uptake from fertilizere6
- Qualifier
- sigmoid curvee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants proliferated rapidly in contact with both”
e6“N uptake from fertilizer with time described a sigmoid curve”
Claim · model-written summary
Uptake from ureaform was lower than from the soluble N sources in oat.
- Taxon
- oatAvena sativae0
- Treatment
- ureaforme3
- Outcome
- uptakee3
- Direction
- lowerinferrede3
- Comparator
- soluble sourcese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants proliferated rapidly in contact with both”
e3“uptake from ureaform was about”
e4“that of the soluble sources”
Claim · model-written summary
Uptake did not differ among NaNO3, (NH4)2SO4 and urea over 7 days in oat.
- Taxon
- oatAvena sativae0
- Treatment
- NaNO 3, (NH 4 ) 2 SO 4, and ureae5
- Outcome
- uptakee5
- Qualifier
- in 7 dayse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants proliferated rapidly in contact with both”
e5“No differences in uptake from NaNO 3 , (NH 4 ) 2 SO 4 , and urea in 7 days were found”
Claim · model-written summary
Recovery by whole oat plants (tops plus roots) ranged from 93 to 62%.
- Taxon
- oatAvena sativae0
- Outcome
- Recovery by whole plantse2
- Value
- 93 to 62%e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants proliferated rapidly in contact with both”
e2“Recovery by whole plants (tops + roots) ranged from 93 to 62%”
Claim · model-written summary
Recovery in top growth of oat from 10 to 40 mg N as (NH4)2SO4 ranged from 67 to 38.5% after 7 days.
- Taxon
- oatAvena sativae0
- Treatment
- 10 to 40 mg. of N applied as (NH 4 ) 2 SO 4e1
- Outcome
- recovery in top growthe1
- Value
- 67 to 38.5%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants proliferated rapidly in contact with both”
e1“recovery in top growth of 10 to 40 mg. of N applied as (NH 4 ) 2 SO 4 ranged from 67 to 38.5% after 7 days”
Claim · model-written summary
Maximum N uptake in oat occurred at approximately the soil moisture equivalent in Hartsells fine sandy loam and Webster silty clay loam.
- Taxon
- oatAvena sativae0
- Outcome
- maximum N uptakee1
- Setting
- Hartsells fine sandy loam and Webster silty clay loame2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants proliferated rapidly in contact with both”
e1“The moisture equivalent was approximately the soil moisture level at which maximum N uptake occurred”
e2“from Hartsells fine sandy loam and Webster silty clay loam”
Claim · model-written summary
Selective absorption of nitrate and ammonium by oat was not apparent under the experimental conditions.
- Taxon
- oatAvena sativae1
- Outcome
- selective absorptione2
- Qualifier
- not apparent under the experimental conditionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“ions by oat plants was not apparent under the experimental conditions”
e2“Since selective absorption of NO 3”