Abstract
A pot experiment was conducted to study the effect of fertilizing chickpea with 15N-labelled urea alone, urea with hydroquinone, or organic plant materials on the stability of 15N enrichment of available soil nitrogen (N). An isotopic dilution method was used to estimate N2-fixation using a non-nodulating chickpea genotype as a reference crop. The use of hydroquinone-containing urea as well as the use of labelled organic material resulted in a stable 15N enrichment of the available soil N with time as compared with urea alone. Estimates of N2-fixation were not affected by the three different 15N-labelled fertilizer applications employed. The high N2-fixation in chickpea, and the appropriate use of a reference crop, which has a unique N uptake pattern, can adjust the error in the estimation of N2 fixation when a decline occurs in 15N enrichment. On the other hand, the addition of hydroquinone to urea significantly increased its efficient use as a nitrogen fertilizer as compared with urea alone.
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Claims 4
Claim · model-written summary
Hydroquinone-containing urea and labelled organic material gave a stable 15N enrichment of soil N over time, compared with urea alone.
- Taxon
- chickpea
Cicer arietinumt0 - Treatment
- hydroquinone-containing urea as well as the use of labelled organic materiale1
- Outcome
- 15N enrichment of the available soil Ne1
- Direction
- no_changeinferrede1
- Comparator
- urea alonee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2-FIXATION IN CHICKPEA”
e1“The use of hydroquinone-containing urea as well as the use of labelled organic material resulted in a stable 15N enrichment of the available soil N with time as compared with urea alone”
Claim · model-written summary
The three different 15N-labelled fertilizer applications did not affect estimates of N2 fixation in chickpea.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- three different 15N-labelled fertilizer applicationse2
- Outcome
- Estimates of N2-fixatione2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2-FIXATION IN CHICKPEA”
e2“Estimates of N2-fixation were not affected by the three different 15N-labelled fertilizer applications employed”
Claim · model-written summary
Adding hydroquinone to urea significantly increased its efficient use as a nitrogen fertilizer compared with urea alone.
- Taxon
- chickpeaCicer arietinumt0
- Treatment
- addition of hydroquinone to ureae4
- Outcome
- efficient use as a nitrogen fertilizere4
- Direction
- increasede4
- Comparator
- urea alonee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2-FIXATION IN CHICKPEA”
e4“On the other hand, the addition of hydroquinone to urea significantly increased its efficient use as a nitrogen fertilizer as compared with urea alone”
Claim · model-written summary
The high N2 fixation in chickpea allows the error in the estimation of N2 fixation to be adjusted when 15N enrichment declines, using a non-nodulating chickpea reference genotype.
- Taxon
- chickpeaCicer arietinumt0
- Outcome
- error in the estimation of N2 fixatione3
- Comparator
- non-nodulating chickpea genotypee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“N2-FIXATION IN CHICKPEA”
e3“The high N2-fixation in chickpea, and the appropriate use of a reference crop, which has a unique N uptake pattern, can adjust the error in the estimation of N2 fixation when a decline occurs in 15N enrichment”
e5“An isotopic dilution method was used to estimate N2-fixation using a non-nodulating chickpea genotype as a reference crop”
The same questions in other papers
fertilization · symbiosis · Cicer arietinum (chickpea)Results differ
4 papers in the same direction as this paper · 43 in the opposite direction
- positive
- positive
- positive
44 papers more in this group
See all 48 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.