Abstract
A field study was conducted in the sub-humid tropical region of India to examine the effect of different nitrogen (N) management strategies on nitrate leaching, nitrous oxide (N2O) emission and N use efficiency in aerobic rice. Treatments were: control (no N), 120 kg N ha−1 applied as prilled urea (PU) in conventional method, 120 kg N ha−1 applied as neem coated urea (NCU) in conventional method, N applied as PU on the basis of leaf colour chart (LCC) reading, N applied as NCU on the basis of LCC reading, and 120 kg N ha−1 applied as PU and farm yard manure (FYM) in 1:1 ratio. Results showed that 3.4–16.1 kg NO3-N ha−1 was leached below 45 cm depth and 0.61–1.12 kg N2O-N ha−1 was emitted from aerobic rice during the growing season. NCU when applied conventionally reduced nitrate-nitrogen (NO3-N) leaching and N2O emission by 18.6% and 21.4%, respectively However when applied on the basis of LCC reading NCU reduced NO3-N leaching by 39.8% as compared to PU applied in conventional method. NCU when applied on the basis of LCC reading synchronized N supply with demand and reduced N loss, which resulted in higher yield and N use efficiency.
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Claims 8
Claim · model-written summary
Aerobic rice plots leached 3.4–16.1 kg NO3-N ha−1 below 45 cm.
Verbatim
e0“3.4–16.1 kg NO3-N ha−1 was leached below 45 cm depth”
t0“aerobic rice”
Claim · model-written summary
Aerobic rice plots emitted 0.61–1.12 kg N2O-N ha−1.
Verbatim
e0“0.61–1.12 kg N2O-N ha−1 was emitted from aerobic rice during the growing season”
Claim · model-written summary
Conventionally applied NCU reduced NO3-N leaching by 18.6%.
- Taxon
- aerobic ricet0
- Treatment
- NCU when applied conventionallye0
- Outcome
- nitrate-nitrogen (NO3-N) leachinge0
- Direction
- reducede0
- Value
- 18.6%e0
Not reportedComparator
Verbatim
e0“NCU when applied conventionally reduced nitrate-nitrogen (NO3-N) leaching and N2O emission by 18.6% and 21.4%, respectively”
t0“aerobic rice”
Claim · model-written summary
Conventionally applied NCU reduced N2O emissions by 21.4%.
- Taxon
- aerobic ricet0
- Treatment
- NCU when applied conventionallye0
- Outcome
- N2O emissione0
- Direction
- reducede0
- Value
- 21.4%e0
Not reportedComparator
Verbatim
e0“NCU when applied conventionally reduced nitrate-nitrogen (NO3-N) leaching and N2O emission by 18.6% and 21.4%, respectively”
t0“aerobic rice”
Claim · model-written summary
LCC-guided NCU reduced NO3-N leaching by 39.8% versus conventional PU.
Verbatim
e0“when applied on the basis of LCC reading NCU reduced NO3-N leaching by 39.8% as compared to PU applied in conventional method”
t0“aerobic rice”
Claim · model-written summary
LCC-guided NCU synchronized nitrogen supply with demand and reduced nitrogen loss.
- Taxon
- aerobic ricet0
- Treatment
- NCU when applied on the basis of LCC readinge0
- Outcome
- N losse0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“NCU when applied on the basis of LCC reading synchronized N supply with demand and reduced N loss”
t0“aerobic rice”
Claim · model-written summary
LCC-guided NCU resulted in higher rice yield.
- Taxon
- aerobic ricet0
- Treatment
- NCU when applied on the basis of LCC readinge0
- Outcome
- yielde0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“NCU when applied on the basis of LCC reading synchronized N supply with demand and reduced N loss, which resulted in higher yield and N use efficiency”
t0“aerobic rice”
Claim · model-written summary
LCC-guided NCU resulted in higher nitrogen use efficiency.
- Taxon
- aerobic ricet0
- Treatment
- NCU when applied on the basis of LCC readinge0
- Outcome
- N use efficiencye0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“NCU when applied on the basis of LCC reading synchronized N supply with demand and reduced N loss, which resulted in higher yield and N use efficiency”
t0“aerobic rice”
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