Abstract
The paper studied the nitrogen dynamic in rice-soil-leakage water system under different N application levels based on split supply in paddy rice field. The result showed that N uptake of rice increased quickly with the N application up to (225) kg/hm~2, and N uptake amount changed little when the applied nitrogen were more than 225 kg/hm~2. Nitrogen accumulation dynamic in soil showed that the long-term fertility for rice crop growth could not be sustained under 75 kg/hm~2 N application, but when N supply exceeded 225 kg/hm~2, a lot of surplus nitrogen was accumulated in soil. There was significant correlation between nitrogen applied levels with average total N concentration of the leakage water andcoefficient is 0.943. The period of booting stage to grain-filling stage is an important time for rice nitrogen uptake. N accumulation in soil increased quickly and the peak of N content in leakage water appeared after basal nitrogen applied, which implied that basal nitrogen fertilizer being more than 50% of the total applied amount may be the main reason leading to soil nitrogen accumulation and water pollution.
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Claims 9
Claim · model-written summary
Rice nitrogen uptake increased rapidly as N application rose to 225 kg/hm~2.
- Taxon
- rice
Oryza sativae0 - Treatment
- N application up to (225) kg/hm~2e0
- Outcome
- N uptakee0
- Direction
- increased quicklye0
- Value
- (225) kg/hm~2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N uptake of rice increased quickly with the N application up to (225) kg/hm~2”
Claim · model-written summary
Rice nitrogen uptake changed little above 225 kg/hm~2 of applied N.
- Taxon
- Paddyt0
- Treatment
- applied nitrogen were more than 225 kg/hm~2e0
- Outcome
- N uptake amounte0
- Direction
- changed littlee0
Not reportedComparator
Verbatim
e0“N uptake amount changed little when the applied nitrogen were more than 225 kg/hm~2”
t0“Paddy Field System”
Claim · model-written summary
A 75 kg/hm~2 N application did not sustain long-term soil fertility for rice growth.
- Taxon
- riceOryza sativae0
- Treatment
- 75 kg/hm~2 N applicatione0
- Outcome
- long-term fertility for rice crop growthe0
- Direction
- could not be sustainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the long-term fertility for rice crop growth could not be sustained under 75 kg/hm~2 N application”
Claim · model-written summary
N supply above 225 kg/hm~2 led to substantial surplus nitrogen accumulation in soil.
- Taxon
- Paddyt0
- Treatment
- N supply exceeded 225 kg/hm~2e0
- Outcome
- surplus nitrogen was accumulated in soile0
- Direction
- accumulatede0
Not reportedComparator
Verbatim
e0“when N supply exceeded 225 kg/hm~2, a lot of surplus nitrogen was accumulated in soil”
t0“Paddy Field System”
Claim · model-written summary
N application level correlated significantly with average total N concentration in leakage water, with coefficient 0.943.
- Taxon
- Paddyt0
- Treatment
- nitrogen applied levelse0
- Outcome
- average total N concentration of the leakage watere0
- Value
- 0.943e0
Not reportedDirection
Verbatim
e0“significant correlation between nitrogen applied levels with average total N concentration of the leakage water andcoefficient is 0.943”
t0“Paddy Field System”
Claim · model-written summary
Booting through grain filling was identified as an important period of rice N uptake.
- Taxon
- riceOryza sativae0
- Organ / stage
- booting stage to grain-filling stagee0
- Outcome
- nitrogen uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The period of booting stage to grain-filling stage is an important time for rice nitrogen uptake”
Claim · model-written summary
Soil N accumulation increased rapidly after basal N application.
- Taxon
- Paddyt0
- Treatment
- basal nitrogen appliede0
- Outcome
- N accumulation in soile0
- Direction
- increased quicklye0
Not reportedComparator
Verbatim
e0“N accumulation in soil increased quickly and the peak of N content in leakage water appeared after basal nitrogen applied”
t0“Paddy Field System”
Claim · model-written summary
Leakage-water N content peaked after basal N application.
Not reportedComparator
Verbatim
e0“the peak of N content in leakage water appeared after basal nitrogen applied”
t0“Paddy Field System”
Claim · model-written summary
The authors suggest that basal N above half of total application may cause soil N accumulation and water pollution.
Verbatim
e0“basal nitrogen fertilizer being more than 50% of the total applied amount may be the main reason leading to soil nitrogen accumulation and water pollution”
t0“Paddy Field System”
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See all 511 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.