Abstract
The nitrification inhibitors (NIs) effects on soil nitrogen (N) fates and maize yields were investigated in a loamy-sand soil in Thailand. The treatments were chemical fertilizer (CF) and CF with dicyandiamide (DCD) or neem oil at two rates of 5% and 10%. Compared to the CF plot, DCD and neem oil reduced the cumulative nitrous oxide (N2O) emission by the equivalent of 26% and 10%, respectively (P < 0.05). DCD and neem oil had a positive effect in slowing ammonium (NH4+)-conversion and prolonging NH4+-N in the soil with a maximum efficiency of 45% and 30%, respectively. NO3–N was higher in the NI plots (P < 0.05), but the effect was less pronounced later in the growing season. Adding the NIs increased maize yields and N uptake, but was only significant (P < 0.10) for neem oil. Results indicate that applying NIs is an effective method to mitigate soil N losses and enhancing N use efficiency in a tropical, agricultural field.
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Claims 8
Claim · model-written summary
DCD reduced cumulative N2O emission by 26% compared with the CF plot.
- Treatment
- DCDe1
- Outcome
- cumulative nitrous oxide (N2O) emissione1
- Direction
- reducede1
- Value
- 26%e1
- Comparator
- CF plote1
- Setting
- loamy-sand soil in Thailande0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea maysL.) Yield”
e0“investigated in a loamy-sand soil in Thailand”
e1“Compared to the CF plot, DCD and neem oil reduced the cumulative nitrous oxide (N2O) emission by the equivalent of 26% and 10%, respectively (P < 0.05)”
Claim · model-written summary
Neem oil reduced cumulative N2O emission by 10% compared with the CF plot.
- Treatment
- neem oile1
- Outcome
- cumulative nitrous oxide (N2O) emissione1
- Direction
- reducede1
- Value
- 10%e1
- Comparator
- CF plote1
- Setting
- loamy-sand soil in Thailande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea maysL.) Yield”
e0“investigated in a loamy-sand soil in Thailand”
e1“Compared to the CF plot, DCD and neem oil reduced the cumulative nitrous oxide (N2O) emission by the equivalent of 26% and 10%, respectively (P < 0.05)”
Claim · model-written summary
DCD slowed ammonium conversion, with a maximum efficiency of 45% compared with the CF plot.
- Treatment
- DCDe2
- Outcome
- ammonium (NH4+)-conversione2
- Direction
- slowinge2
- Value
- 45%e2
- Comparator
- CF plote1
- Setting
- loamy-sand soil in Thailande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea maysL.) Yield”
e0“investigated in a loamy-sand soil in Thailand”
e1“Compared to the CF plot, DCD and neem oil reduced the cumulative nitrous oxide (N2O) emission by the equivalent of 26% and 10%, respectively (P < 0.05)”
e2“DCD and neem oil had a positive effect in slowing ammonium (NH4+)-conversion and prolonging NH4+-N in the soil with a maximum efficiency of 45% and 30%, respectively”
Claim · model-written summary
Neem oil slowed ammonium conversion, with a maximum efficiency of 30% compared with the CF plot.
- Treatment
- neem oile2
- Outcome
- ammonium (NH4+)-conversione2
- Direction
- slowinge2
- Value
- 30%e2
- Comparator
- CF plote1
- Setting
- loamy-sand soil in Thailande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea maysL.) Yield”
e0“investigated in a loamy-sand soil in Thailand”
e1“Compared to the CF plot, DCD and neem oil reduced the cumulative nitrous oxide (N2O) emission by the equivalent of 26% and 10%, respectively (P < 0.05)”
e2“DCD and neem oil had a positive effect in slowing ammonium (NH4+)-conversion and prolonging NH4+-N in the soil with a maximum efficiency of 45% and 30%, respectively”
Claim · model-written summary
NO3–N was higher in the NI plots, with the effect less pronounced later in the growing season.
- Treatment
- NIe3
- Outcome
- NO3–Ne3
- Direction
- highere3
- Qualifier
- less pronounced later in the growing seasone3
- Setting
- loamy-sand soil in Thailande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea maysL.) Yield”
e0“investigated in a loamy-sand soil in Thailand”
e3“NO3–N was higher in the NI plots (P < 0.05), but the effect was less pronounced later in the growing season”
Claim · model-written summary
Adding nitrification inhibitors increased maize yields and N uptake.
- Treatment
- NIse4
- Outcome
- maize yields and N uptakee4
- Direction
- increasede4
- Setting
- loamy-sand soil in Thailande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“investigated in a loamy-sand soil in Thailand”
e4“Adding the NIs increased maize yields and N uptake, but was only significant (P < 0.10) for neem oil”
Claim · model-written summary
Neem oil significantly increased maize yield (P < 0.10).
- Treatment
- neem oile4
- Outcome
- maize yieldse4
- Direction
- increasede4
- Qualifier
- P < 0.10e4
- Setting
- loamy-sand soil in Thailande0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“investigated in a loamy-sand soil in Thailand”
e4“Adding the NIs increased maize yields and N uptake, but was only significant (P < 0.10) for neem oil”
Claim · model-written summary
Applying NIs is an effective method to mitigate soil N losses and enhance N use efficiency in a tropical agricultural field.
- Treatment
- applying NIse5
- Outcome
- mitigate soil N losses and enhancing N use efficiencye5
- Setting
- tropical, agricultural fielde5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize (Zea maysL.) Yield”
e5“applying NIs is an effective method to mitigate soil N losses and enhancing N use efficiency in a tropical, agricultural field”
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See all 18 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.