Abstract
Abstract Ingestion of NO 3 ‐N in vegetables represents a major source of dietary intake of NO 3 ‐N and is potentially hazardous to human health. Radish ( Raphanus sativus L.), when cultured in a NO 3 ‐rich medium accumulates substantial quantities of NO 3 ‐N. The main objective of this study was to evaluate the influence of a nitrification suppressor, 2‐chloro‐6‐(trichloromethyl)pyridine (nitrapyrin), on NO 3 ‐N accumulation in radish plants. In one study, ‘Cherry Belle’ radish was grown in pot culture under greenhouse conditions and was fertilized with KNO 3 or (NH 4 ) 2 SO 4 to provide 0, 200, 400, 600, or 800 mg N/pot of soil (1 kg) in a factorial arrangement with pH 6.5 and pH 7.5 and with no nitrapyrin and 50 mg nitrapyrin/pot. In a second study, the same cultivar was grown with 400 mg N/pot, an amount shown to be optimum for growth in the first study, and with nitrapyrin applications of 0, 5, 10, or 50 mg/pot. Nitrate accumulation in the plants was less with (NH 4 ) 2 SO 4 , fertilization than with KNO 3 fertilization, and all nitrapyrin applications essentially eliminated the accumulation in both roots and shoots. Total N concentrations of shoots were significantly greater with NH 4 ‐N than with NO 3 ‐N nutrition although total N in roots was unaffected by N treatment. Shoot growth was greatest with NH 4 ‐N nutrition, but root growth was restricted by NH 4 ‐N nutrition relative to NO 3 ‐N nutrition. Nitrapyrin as such had little effect on plant growth but appeared to increase the potential for NH 4 toxicity. Nitrapyrin caused significantly lower concentrations of NO 3 ‐N in the soil with (NH 4 ) 2 SO 4 fertilization but increased soil NO 3 ‐N levels with KNO 3 treatments. Liming the soil had no effect on any of the factors considered in this study.
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Claims 11
Claim · model-written summary
Ammonium sulfate yielded less radish nitrate than potassium nitrate.
- Taxon
- Radish
Raphanus sativust0 - Treatment
- (NH 4 ) 2 SO 4e0
- Outcome
- Nitrate accumulation in the plantse0
- Direction
- lesse0
- Comparator
- KNO 3 fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate accumulation in the plants was less with (NH 4 ) 2 SO 4 , fertilization than with KNO 3 fertilization”
t0“Radish”
Claim · model-written summary
Every nitrapyrin dose essentially eliminated nitrate accumulation in roots and shoots.
- Taxon
- RadishRaphanus sativust0
- Treatment
- nitrapyrin applicationse0
- Outcome
- accumulation in both roots and shootse0
- Direction
- eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all nitrapyrin applications essentially eliminated the accumulation in both roots and shoots”
t0“Radish”
Claim · model-written summary
Shoot total nitrogen was significantly higher with ammonium than nitrate nutrition.
- Taxon
- RadishRaphanus sativust0
- Treatment
- NH 4 ‐Ne0
- Outcome
- Total N concentrations of shootse0
- Direction
- greatere0
- Comparator
- NO 3 ‐N nutritione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total N concentrations of shoots were significantly greater with NH 4 ‐N than with NO 3 ‐N nutrition”
t0“Radish”
Claim · model-written summary
Nitrogen source did not affect total nitrogen in roots.
- Taxon
- RadishRaphanus sativust0
- Treatment
- N treatmente0
- Outcome
- total N in rootse0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total N in roots was unaffected by N treatment”
t0“Radish”
Claim · model-written summary
Ammonium nutrition gave the greatest shoot growth.
- Taxon
- RadishRaphanus sativust0
- Treatment
- NH 4 ‐N nutritione0
- Outcome
- Shoot growthe0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot growth was greatest with NH 4 ‐N nutrition”
t0“Radish”
Claim · model-written summary
Ammonium restricted root growth relative to nitrate nutrition.
- Taxon
- RadishRaphanus sativust0
- Treatment
- NH 4 ‐N nutritione0
- Outcome
- root growthe0
- Direction
- restrictede0
- Comparator
- NO 3 ‐N nutritione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth was restricted by NH 4 ‐N nutrition relative to NO 3 ‐N nutrition”
t0“Radish”
Claim · model-written summary
Nitrapyrin had little effect on plant growth.
- Taxon
- RadishRaphanus sativust0
- Treatment
- Nitrapyrine0
- Outcome
- plant growthe0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrapyrin as such had little effect on plant growth”
t0“Radish”
Claim · model-written summary
Nitrapyrin appeared to increase potential ammonium toxicity.
- Taxon
- RadishRaphanus sativust0
- Treatment
- Nitrapyrine1
- Outcome
- potential for NH 4 toxicitye0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“appeared to increase the potential for NH 4 toxicity”
t0“Radish”
e1“Nitrapyrin as such had little effect on plant growth”
Claim · model-written summary
With ammonium sulfate, nitrapyrin significantly reduced soil nitrate.
- Taxon
- RadishRaphanus sativust0
- Treatment
- Nitrapyrine0
- Outcome
- concentrations of NO 3 ‐N in the soile0
- Direction
- lowere0
- Qualifier
- (NH 4 ) 2 SO 4 fertilizatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrapyrin caused significantly lower concentrations of NO 3 ‐N in the soil with (NH 4 ) 2 SO 4 fertilization”
t0“Radish”
Claim · model-written summary
With potassium nitrate, nitrapyrin increased soil nitrate.
- Taxon
- RadishRaphanus sativust0
- Treatment
- Nitrapyrine1
- Outcome
- soil NO 3 ‐N levelse0
- Direction
- increasede0
- Qualifier
- KNO 3 treatmentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased soil NO 3 ‐N levels with KNO 3 treatments”
t0“Radish”
e1“Nitrapyrin as such had little effect on plant growth”
Claim · model-written summary
Soil liming had no effect on measured factors.
- Taxon
- RadishRaphanus sativust0
- Treatment
- Liming the soile0
- Outcome
- factors considered in this studye0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Liming the soil had no effect on any of the factors considered in this study”
t0“Radish”
The same questions in other papers
nitrapyrin · growth · Raphanus sativus (radish)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 papers →nitrogen · nutrient: content · Raphanus sativus (radish)Positive and negative results
3 papers in the same direction as this paper · 6 in the opposite direction
- negative
- positive
- positive
6 papers more in this group
See all 10 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.