Abstract
Pot experiments were conducted in 2002-2003 using japonica variety Wuxiangjing 14 and hybrid rice Shanyou 63 as materials. Effects of lower soil Cu concentrations (100, 200 mg/kg) were light on rice height, leaf number of the main stem, elongated internode number and heading date. However, when soil Cu concentration reached 400 mg/kg,rice growth was inhibited seriously, and the degrees of damage on rice growth were enlarged with the increment of soil Cu concentration. With the increase of soil Cu concentration,the yield loss became significant. Which were attributed to the reduction of spikelet numbers per panicle under lower soil Cu concentration (100, 200mg/kg), and the decreases of panicle numbers and spikelet numbers per panicle under higher soil Cu concentration (400 mg/kg and above). The decreases of panicle numbers at higher soil Cu concentrations were mainly related to delay in reviving and establishment of plant,lower initial tillering velocity and maximum tiller numbers. The decrease of spikelet numbers per panicle at higher soil Cu concentrations was chiefly caused by the drop of dry matter weight per stem and spikelet surviving ability (the ratio of survived spikelet number per panicle to the dry matter weight per stem) at heading stage. Total biomass fell significantly with the increase of soil Cu concentration, while no significant decrease of economic coefficients were detected except at very higher soil Cu concentrations (800 mg/kg and (above).)
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Claims 9
Claim · model-written summary
Low soil copper concentrations had little effect on rice height, main stem leaf number, internode number and heading date.
- Taxon
- Rice
Oryza sativat0 - Treatment
- lower soil Cu concentrations (100, 200 mg/kg)e0
- Outcome
- rice height, leaf number of the main stem, elongated internode number and heading datee0
- Direction
- lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of lower soil Cu concentrations (100, 200 mg/kg) were light on rice height, leaf number of the main stem, elongated internode number and heading date.”
t0“Rice”
Claim · model-written summary
At 400 mg/kg soil copper, rice growth was seriously inhibited, with greater damage as copper concentration increased.
- Taxon
- riceOryza sativae0
- Treatment
- soil Cu concentration reached 400 mg/kge0
- Outcome
- rice growthe0
- Direction
- inhibitede0
- Value
- 400 mg/kge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when soil Cu concentration reached 400 mg/kg,rice growth was inhibited seriously, and the degrees of damage on rice growth were enlarged with the increment of soil Cu concentration.”
t0“Rice”
Claim · model-written summary
Rice yield loss increased significantly with soil copper concentration.
- Taxon
- RiceOryza sativat0
- Treatment
- soil Cu concentratione0
- Outcome
- yield losse0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the increase of soil Cu concentration,the yield loss became significant.”
t0“Rice”
Claim · model-written summary
Lower copper concentrations reduced spikelets per panicle.
- Taxon
- RiceOryza sativat0
- Treatment
- lower soil Cu concentration (100, 200mg/kg)e0
- Outcome
- spikelet numbers per paniclee0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduction of spikelet numbers per panicle under lower soil Cu concentration (100, 200mg/kg)”
t0“Rice”
Claim · model-written summary
Higher copper concentrations decreased panicle number and spikelets per panicle.
- Taxon
- RiceOryza sativat0
- Treatment
- higher soil Cu concentration (400 mg/kg and above)e0
- Outcome
- panicle numbers and spikelet numbers per paniclee0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases of panicle numbers and spikelet numbers per panicle under higher soil Cu concentration (400 mg/kg and above)”
t0“Rice”
Claim · model-written summary
Panicle number decreases at high copper were related to delayed establishment and reduced tillering.
- Taxon
- RiceOryza sativat0
- Treatment
- higher soil Cu concentrationse0
- Outcome
- decreases of panicle numberse0
- Direction
- decreasese0
- Qualifier
- delay in reviving and establishment of plant,lower initial tillering velocity and maximum tiller numberse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decreases of panicle numbers at higher soil Cu concentrations were mainly related to delay in reviving and establishment of plant,lower initial tillering velocity and maximum tiller numbers.”
t0“Rice”
Claim · model-written summary
The decline in spikelets per panicle at high copper was attributed to lower dry mass per stem and spikelet survival.
- Taxon
- RiceOryza sativat0
- Treatment
- higher soil Cu concentrationse0
- Outcome
- decrease of spikelet numbers per paniclee0
- Direction
- decreasee0
- Qualifier
- drop of dry matter weight per stem and spikelet surviving abilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease of spikelet numbers per panicle at higher soil Cu concentrations was chiefly caused by the drop of dry matter weight per stem and spikelet surviving ability”
t0“Rice”
Claim · model-written summary
Total rice biomass fell significantly as copper concentration increased.
- Taxon
- RiceOryza sativat0
- Treatment
- soil Cu concentratione0
- Outcome
- Total biomasse0
- Direction
- felle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total biomass fell significantly with the increase of soil Cu concentration”
t0“Rice”
Claim · model-written summary
Economic coefficients generally did not decrease significantly except at very high copper concentration.
- Taxon
- RiceOryza sativat0
- Treatment
- soil Cu concentrations (800 mg/kg and (above)e0
- Outcome
- economic coefficientse0
- Direction
- no significant decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant decrease of economic coefficients were detected except at very higher soil Cu concentrations (800 mg/kg and (above).)”
t0“Rice”
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See all 42 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.