Abstract
Nitrogen uptake and grain yield effects of double cropping rice at different nitrogen application rates in the first crop of ratoon rice were studied. The results show that the N uptake of double cropping rice plants exhibits a parabola curve with N application rates in the first crop of ratoon rice. The N absorption rate is the highest at the panicle development phase in the first crop, the second highest is at the late tillering stage and the grain filling stage of the first crop and during the period from harvest stage of the first crop to full heading stage of the second crop of ratoon rice. Among the total N uptake of rice plants, the ratio of uptake of soil N decreases as N application rate enhances and the uptake of fertilizer N shows a parabola curve with the increasing of N application rates. At the grain filling stage, it is the main N source transported from vegetable parts to grains. The relationship between the dry matter accumulation of double cropping rice and the N application rates in the first crop is also a parabola curve, in that the net assimilation rate (NAR) significantly decreases when the N application is over limitation, in turn leading to reduced crop growth rate (CGR) and net dry matter accumulation. Grain yield has a closely significantly positive correlation with the total dry matter accumulation, specially a very close correlation with the net dry matter accumulation of the middle late stages in the first crop. The grain yield of the second crop also shows a very close correlation with the net dry matter accumulation of the middle late stages in the first crop. The net dry matter accumulations recorded in the middle late stages and the grain yield in the first and second crops are the highest after applying N 225～300kg/hm 2 in the first crop and suitable bud fertilizer in the rationed rice, indicating that the grain yield of the first crop is 10913～11300kg/hm 2 and that of the second crop of ratoon rice is 7565～7878kg/hm 2.
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Claims 13
Claim · model-written summary
N uptake of double-cropping rice followed a parabola curve with N application rate in the first crop of ratoon rice.
Not reportedComparator
Verbatim
e0“the N uptake of double cropping rice plants exhibits a parabola curve with N application rates in the first crop of ratoon rice”
Claim · model-written summary
The N absorption rate of rice was highest at the panicle development phase in the first crop.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- panicle development phasee0
- Outcome
- N absorption ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“The N absorption rate is the highest at the panicle development phase in the first crop”
Claim · model-written summary
The N absorption rate was second highest at late tillering and grain filling of the first crop and from first-crop harvest to full heading of the second crop.
- Taxon
- riceOryza sativat0
- Organ / stage
- late tillering stagee0
- Outcome
- second higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“the second highest is at the late tillering stage and the grain filling stage of the first crop and during the period from harvest stage of the first crop to full heading stage of the second crop of ratoon rice”
Claim · model-written summary
The share of soil N in total rice N uptake decreased as N application rate increased.
- Taxon
- riceOryza sativat0
- Treatment
- N application ratee0
- Outcome
- ratio of uptake of soil Ne0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“the ratio of uptake of soil N decreases as N application rate enhances”
Claim · model-written summary
Fertilizer N uptake followed a parabola curve with increasing N application rate.
- Taxon
- riceOryza sativat0
- Treatment
- N application ratese0
- Outcome
- uptake of fertilizer Ne0
- Direction
- parabola curvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“the uptake of fertilizer N shows a parabola curve with the increasing of N application rates”
Claim · model-written summary
Dry matter accumulation of double-cropping rice followed a parabola curve with first-crop N application rate.
- Taxon
- double cropping ricee0
- Treatment
- N application ratese0
- Outcome
- dry matter accumulatione0
- Direction
- parabola curvee0
Not reportedComparator
Verbatim
e0“The relationship between the dry matter accumulation of double cropping rice and the N application rates in the first crop is also a parabola curve”
Claim · model-written summary
Excess N application significantly decreased net assimilation rate, reducing crop growth rate and net dry matter accumulation.
- Taxon
- riceOryza sativat0
- Treatment
- N application is over limitatione0
- Outcome
- net assimilation rate (NAR)e0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“the net assimilation rate (NAR) significantly decreases when the N application is over limitation, in turn leading to reduced crop growth rate (CGR) and net dry matter accumulation”
Claim · model-written summary
Grain yield correlated significantly and positively with total dry matter accumulation.
- Taxon
- riceOryza sativat0
- Compound
- total dry matter accumulatione0
- Outcome
- Grain yielde0
- Direction
- positive correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“Grain yield has a closely significantly positive correlation with the total dry matter accumulation”
Claim · model-written summary
First-crop grain yield correlated very closely with net dry matter accumulation in the middle to late stages of the first crop.
- Taxon
- riceOryza sativat0
- Organ / stage
- middle late stages in the first crope0
- Outcome
- net dry matter accumulation of the middle late stagese0
- Direction
- very close correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“specially a very close correlation with the net dry matter accumulation of the middle late stages in the first crop”
Claim · model-written summary
Second-crop grain yield also correlated very closely with net dry matter accumulation in the middle to late stages of the first crop.
- Taxon
- riceOryza sativat0
- Organ / stage
- middle late stages in the first crope0
- Outcome
- grain yield of the second crope0
- Direction
- very close correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“The grain yield of the second crop also shows a very close correlation with the net dry matter accumulation of the middle late stages in the first crop”
Claim · model-written summary
Net dry matter accumulation and grain yield of both crops were highest with 225-300 kg/hm2 N in the first crop plus suitable bud fertilizer.
- Taxon
- riceOryza sativat0
- Treatment
- applying N 225～300kg/hm 2e0
- Outcome
- grain yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“The net dry matter accumulations recorded in the middle late stages and the grain yield in the first and second crops are the highest after applying N 225～300kg/hm 2 in the first crop and suitable bud fertilizer in the rationed rice”
Claim · model-written summary
First-crop grain yield was 10913-11300 kg/hm2.
- Taxon
- riceOryza sativat0
- Outcome
- grain yield of the first crope0
- Value
- 10913～11300kg/hm 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“the grain yield of the first crop is 10913～11300kg/hm 2”
Claim · model-written summary
Second-crop grain yield of ratoon rice was 7565-7878 kg/hm2.
- Taxon
- riceOryza sativat0
- Outcome
- second crop of ratoon ricee0
- Value
- 7565～7878kg/hm 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“double-cropping rice”
e0“that of the second crop of ratoon rice is 7565～7878kg/hm 2”
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