Abstract
Abstract To evaluate the contribution of mass flow to the absorption of topdressed N by paddy rice, a pot experiment was conducted under different rates of water uptake at the panicle formation stage. The rate of water uptake was !Dodified by using two different values of relative humidity (RH, 75% and 95%). Labelled N was used to determine the amount of absorbed fertilizer-derived N in the rice plants. The amount of ammonium N (NH4 +-N) in the floodwater was depleted within 48 h after topdressing (HAT) in all the treatments. The concentration of NH4 +-N in the soil solution decreased with depth in the top 0.03 m of soil. N in the soil solution from 0 to 0.03 m soil depth was almost depleted by 48 HAT. The percentage of fertilizer-derived N recovered by plants and the pattern of N accumulation were the same in all the RH treatments. However, in the course of the entire experiment, the amount of N absorbed through mass flow was larger in the 75% RH treatment during the first 48 h. Moreover, under 75% RH conditions, the percentage of topdressed N in the plants that was associated with N absorbed through mass flow was 78% at 48 HAT and 29% at 168 HAT. These values were significantly higher than -the previously reported values for basal N (2.5–6.3%). Therefore, it is concluded that the role of mass flow in N absorption is more significant for topdressed N than for basal N.
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Claims 9
Claim · model-written summary
Ammonium N in the floodwater was depleted within 48 h after topdressing in all treatments.
Verbatim
e1“To evaluate the contribution of mass flow to the absorption of topdressed N by paddy rice”
e2“The amount of ammonium N (NH4 +-N) in the floodwater was depleted within 48 h after topdressing (HAT) in all the treatments”
Claim · model-written summary
NH4+-N concentration in the soil solution decreased with depth in the top 0.03 m of soil.
Verbatim
e1“To evaluate the contribution of mass flow to the absorption of topdressed N by paddy rice”
e3“The concentration of NH4 +-N in the soil solution decreased with depth in the top 0.03 m of soil”
Claim · model-written summary
N in the soil solution from 0 to 0.03 m depth was almost depleted by 48 HAT.
Verbatim
e1“To evaluate the contribution of mass flow to the absorption of topdressed N by paddy rice”
e4“N in the soil solution from 0 to 0.03 m soil depth was almost depleted by 48 HAT”
Claim · model-written summary
The percentage of fertilizer-derived N recovered by plants and the pattern of N accumulation were the same across the two relative humidity treatments.
- Taxon
- paddy ricee1
- Treatment
- relative humidity (RH, 75% and 95%)e6
- Outcome
- percentage of fertilizer-derived N recovered by plants and the pattern of N accumulatione5
- Direction
- the samee5
Not reportedComparator
Verbatim
e1“To evaluate the contribution of mass flow to the absorption of topdressed N by paddy rice”
e5“The percentage of fertilizer-derived N recovered by plants and the pattern of N accumulation were the same in all the RH treatments”
e6“two different values of relative humidity (RH, 75% and 95%)”
Claim · model-written summary
The amount of N absorbed through mass flow was larger in the 75% RH treatment during the first 48 h.
- Taxon
- paddy ricee1
- Treatment
- 75% RHe6
- Outcome
- amount of N absorbed through mass flowe6
- Direction
- largere6
- Qualifier
- during the first 48 he6
Not reportedComparator
Verbatim
e1“To evaluate the contribution of mass flow to the absorption of topdressed N by paddy rice”
e6“the amount of N absorbed through mass flow was larger in the 75% RH treatment during the first 48 h”
Claim · model-written summary
Under 75% RH, 78% of topdressed N in the plants was associated with N absorbed through mass flow at 48 HAT.
Verbatim
e1“To evaluate the contribution of mass flow to the absorption of topdressed N by paddy rice”
e7“under 75% RH conditions, the percentage of topdressed N in the plants that was associated with N absorbed through mass flow was 78% at 48 HAT”
Claim · model-written summary
Under 75% RH, 29% of topdressed N in the plants was associated with N absorbed through mass flow at 168 HAT.
Verbatim
e1“To evaluate the contribution of mass flow to the absorption of topdressed N by paddy rice”
e7“under 75% RH conditions, the percentage of topdressed N in the plants that was associated with N absorbed through mass flow was 78% at 48 HAT and 29% at 168 HAT”
Claim · model-written summary
The percentage of topdressed N associated with mass flow was significantly higher than the previously reported values for basal N.
Verbatim
e1“To evaluate the contribution of mass flow to the absorption of topdressed N by paddy rice”
e7“the percentage of topdressed N in the plants that was associated with N absorbed through mass flow was 78% at 48 HAT and 29% at 168 HAT”
e6“These values were significantly higher than -the previously reported values for basal N (2.5–6.3%)”
Claim · model-written summary
Mass flow is more significant in N absorption for topdressed N than for basal N.
Verbatim
e1“To evaluate the contribution of mass flow to the absorption of topdressed N by paddy rice”
e2“the role of mass flow in N absorption is more significant for topdressed N than for basal N”
The same questions in other papers
humidity · nutrient: content · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
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.