Abstract
Exploring Approaches To Optimizing Spatial Distributions of Leaf Area index (Lai) and Leaf Nitrogen Content (Lnc) Should Be Useful For increasing Grain Yield in Rice (Oryza Sativa). THe Primary Objective of This Study Was ToCharacterize The Variation of Lai and Lnc Distributions Within The Canopy in Relation To Grain Yield and N Uptake in Rice.Two Experiments With Different N Fertilization Rates Under Conventional and intermittent Irrigation (Ci and Ii, Respectively) Were Conducted in 2002 and 2003, Using Japonica Rice Cultivar Wuyujing9. The Results Showed That Grain Yield and N Uptake Were Significantly Different Among Application Rates of N (N Rates), But Did Not Differ Between Ci and Ii. Lai Distribution At Full Heading Was Affected Significantly By N Rate But Hardly By The Irrigation Method. individual Lai increased With The N Rate. To Achieve A High Yield, The Proper Distribution of Lai in The Canopy Can Be Designed As The Largest in The 2Nd Leaf From The Top, Followed By The 3Rd and 4Th Leaves, and The Smallest in The Top Leaf. Lnc On The Base of Both Area and Dry Matter At 15 Days After Full Heading Decreased From The Top To Lower Leaves in The Canopy, and Significantly increased With The N Rate. Grain Yield Was Enhanced Linearly With The increasing N Content of The Upper Two Leaves, But Hindered By The High N Content of Lower Leaves. These Results indicate That The Spatial Distributions of Both Lnc and Lai Could Be Optimized To Achieve Maximum Canopy Photosynthesis and Grain Yield in Rice.
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Claims 11
Claim · model-written summary
Grain yield differed significantly among N application rates.
- Taxon
- Rice
Oryza sativat0 - Treatment
- Application Rates of Ne0
- Outcome
- Grain Yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Grain Yield and N Uptake Were Significantly Different Among Application Rates of N (N Rates)”
Claim · model-written summary
N uptake differed significantly among N application rates.
- Taxon
- RiceOryza sativat0
- Treatment
- Application Rates of Ne0
- Outcome
- N Uptakee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Grain Yield and N Uptake Were Significantly Different Among Application Rates of N (N Rates)”
Claim · model-written summary
Grain yield and N uptake did not differ between conventional and intermittent irrigation.
- Taxon
- RiceOryza sativat0
- Treatment
- intermittent Irrigatione1
- Outcome
- Grain Yield and N Uptakee0
- Direction
- Did Not Differe0
- Comparator
- Conventionale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Grain Yield and N Uptake Were Significantly Different Among Application Rates of N (N Rates), But Did Not Differ Between Ci and Ii”
e1“Conventional and intermittent Irrigation (Ci and Ii, Respectively)”
Claim · model-written summary
LAI distribution at full heading was significantly affected by N rate.
- Taxon
- RiceOryza sativat0
- Treatment
- N Ratee0
- Outcome
- Lai Distribution At Full Headinge0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Lai Distribution At Full Heading Was Affected Significantly By N Rate”
Claim · model-written summary
Irrigation method hardly affected LAI distribution at full heading.
- Taxon
- RiceOryza sativat0
- Treatment
- Irrigation Methode0
- Outcome
- Lai Distribution At Full Headinge0
- Direction
- Hardlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Lai Distribution At Full Heading Was Affected Significantly By N Rate But Hardly By The Irrigation Method”
Claim · model-written summary
Individual LAI increased with N rate.
- Taxon
- RiceOryza sativat0
- Treatment
- N Ratee0
- Outcome
- individual Laie0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“individual Lai increased With The N Rate”
Claim · model-written summary
For high yield the suggested LAI distribution peaks in the second leaf, then third and fourth, with the top leaf smallest.
- Taxon
- RiceOryza sativat0
- Outcome
- Proper Distribution of Lai in The Canopye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“To Achieve A High Yield, The Proper Distribution of Lai in The Canopy Can Be Designed As The Largest in The 2Nd Leaf From The Top, Followed By The 3Rd and 4Th Leaves, and The Smallest in The Top Leaf”
Claim · model-written summary
LNC on area and dry-matter bases decreased from top to lower leaves after full heading.
- Taxon
- RiceOryza sativat0
- Organ / stage
- 15 Days After Full Headinge0
- Outcome
- Lnc On The Base of Both Area and Dry Mattere0
- Direction
- Decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Lnc On The Base of Both Area and Dry Matter At 15 Days After Full Heading Decreased From The Top To Lower Leaves in The Canopy”
Claim · model-written summary
LNC significantly increased with N rate.
- Taxon
- RiceOryza sativat0
- Treatment
- N Ratee0
- Outcome
- Lnce0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Lnc On The Base of Both Area and Dry Matter At 15 Days After Full Heading Decreased From The Top To Lower Leaves in The Canopy, and Significantly increased With The N Rate”
Claim · model-written summary
Grain yield rose linearly with N content in the upper two leaves.
- Taxon
- RiceOryza sativat0
- Organ / stage
- Upper Two Leavese0
- Outcome
- Grain Yielde0
- Direction
- Enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Grain Yield Was Enhanced Linearly With The increasing N Content of The Upper Two Leaves”
Claim · model-written summary
High N content of lower leaves hindered grain yield.
- Taxon
- RiceOryza sativat0
- Organ / stage
- Lower Leavese0
- Outcome
- Grain Yielde0
- Direction
- Hinderede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Grain Yield Was Enhanced Linearly With The increasing N Content of The Upper Two Leaves, But Hindered By The High N Content of Lower Leaves”
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