Abstract
Two rice cultivars of Shanyou 63(indica)and Lianjing 6(japonica)were grown in field experiments with two nitrogen(N)managements,site-specific N management(SSNM,N application according to soil fertility,leaf color and growth status,and cultivar types)and farmers' fertilizer practice(FFP).Present investigation was aimed to determine the effect of SSNM on roots growth and yield of rice.Results showed that the root dry weight in the FFP was higher as compared to that in the SSNM before heading,whereas it was lower at and after heading.During the whole growing season,SSNM significantly increased the root-shoot ratio.Compared with FFP,SSNM increased root oxidation activity(ROA)at and after panicle initiation,especially ROA per stem.SSNM also increased the photosynthetic rate of the flag leaves after heading.Compared with FFP,SSNM increased grain yield by 7.2%-9.4%,N partial-factor productivity(grain yield/amount of N applied)by 38%-46%,and N agronomic efficiency by 56%-77%.The enhancement of root growth at the latter growing stage would account for the increase in grain yield and N use efficiency under SSNM.
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Claims 9
Claim · model-written summary
Root dry weight under farmers fertilizer practice (FFP) was higher than under SSNM before heading.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- before headinge1
- Treatment
- FFPe1
- Outcome
- root dry weighte1
- Direction
- highere1
- Comparator
- SSNMe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“roots and yield of rice”
e1“Results showed that the root dry weight in the FFP was higher as compared to that in the SSNM before heading, whereas it was lower at and after heading”
Claim · model-written summary
Root dry weight under FFP was lower than under SSNM at and after heading.
- Taxon
- riceOryza sativat0
- Organ / stage
- at and after headinge1
- Treatment
- FFPe1
- Outcome
- root dry weighte1
- Direction
- lowere1
- Comparator
- SSNMe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“roots and yield of rice”
e1“Results showed that the root dry weight in the FFP was higher as compared to that in the SSNM before heading, whereas it was lower at and after heading”
Claim · model-written summary
SSNM significantly increased the root-shoot ratio during the whole growing season.
- Taxon
- riceOryza sativat0
- Treatment
- SSNMe2
- Outcome
- root-shoot ratioe2
- Direction
- increasede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“roots and yield of rice”
e2“During the whole growing season, SSNM significantly increased the root-shoot ratio”
Claim · model-written summary
SSNM increased root oxidation activity at and after panicle initiation compared with FFP.
- Taxon
- riceOryza sativat0
- Organ / stage
- at and after panicle initiatione3
- Treatment
- SSNMe3
- Outcome
- root oxidation activity(ROA)e3
- Direction
- increasede3
- Comparator
- FFPe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“roots and yield of rice”
e3“Compared with FFP,SSNM increased root oxidation activity(ROA)at and after panicle initiation,especially ROA per stem”
Claim · model-written summary
SSNM increased the photosynthetic rate of flag leaves after heading.
- Taxon
- riceOryza sativat0
- Organ / stage
- flag leavese4
- Treatment
- SSNMe4
- Outcome
- photosynthetic ratee4
- Direction
- increasede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“roots and yield of rice”
e4“SSNM also increased the photosynthetic rate of the flag leaves after heading”
Claim · model-written summary
SSNM increased rice grain yield by 7.2%-9.4% compared with FFP.
- Taxon
- riceOryza sativat0
- Treatment
- SSNMe5
- Outcome
- grain yielde5
- Direction
- increasede5
- Value
- 7.2%-9.4%e5
- Comparator
- FFPe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“roots and yield of rice”
e5“Compared with FFP,SSNM increased grain yield by 7.2%-9.4%,N partial-factor productivity(grain yield/amount of N applied)by 38%-46%,and N agronomic efficiency by 56%-77%”
Claim · model-written summary
SSNM increased N partial-factor productivity by 38%-46% compared with FFP.
- Taxon
- riceOryza sativat0
- Treatment
- SSNMe5
- Outcome
- N partial-factor productivitye5
- Direction
- increasede5
- Value
- 38%-46%e5
- Comparator
- FFPe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“roots and yield of rice”
e5“Compared with FFP,SSNM increased grain yield by 7.2%-9.4%,N partial-factor productivity(grain yield/amount of N applied)by 38%-46%,and N agronomic efficiency by 56%-77%”
Claim · model-written summary
SSNM increased N agronomic efficiency by 56%-77% compared with FFP.
- Taxon
- riceOryza sativat0
- Treatment
- SSNMe5
- Outcome
- N agronomic efficiencye5
- Direction
- increasede5
- Value
- 56%-77%e5
- Comparator
- FFPe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“roots and yield of rice”
e5“Compared with FFP,SSNM increased grain yield by 7.2%-9.4%,N partial-factor productivity(grain yield/amount of N applied)by 38%-46%,and N agronomic efficiency by 56%-77%”
Claim · model-written summary
Enhanced root growth at the latter growing stage would account for higher grain yield and N use efficiency under SSNM.
- Taxon
- riceOryza sativat0
- Treatment
- SSNMe6
- Outcome
- increase in grain yield and N use efficiencye6
- Qualifier
- enhancement of root growth at the latter growing stagee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“roots and yield of rice”
e6“The enhancement of root growth at the latter growing stage would account for the increase in grain yield and N use efficiency under SSNM”
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fertilization · nutrient: efficiency · Oryza sativa (rice)Positive and negative results
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- no effect
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3,182 papers in the same direction as this paper · 207 in the opposite direction · 65 reporting no difference from an alternative
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- no effect
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See all 3,455 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.