Abstract
Abstract A 2‐year field experiment and a pot experiment were carried out to compare Mn uptake, tillering, and plant growth of lowland rice grown under different soil water conditions in the ground‐cover rice‐production system (GCRPS) in Beijing, North China. The field experiment was conducted in 2001 and 2002, including two treatments: lowland‐rice variety ( Oryza sativa L. spp. japonica ) grown under thin (14 μm) plastic‐film soil cover (GCRPS plastic ) at 80%–90% water‐holding capacity (WHC) and traditional lowland rice (paddy control) grown with 3 cm standing‐water table. The pot experiment was conducted in a greenhouse with four treatments: (1) traditional lowland rice: paddy control; (2) GCRPS, water‐saturated soil: GCRPS saturated ; (3) GCRPS at 90% water‐holding capacity (WHC): GCRPS 90%WHC ; and (4) GCRPS at 70% WHC: GCRPS 70%WHC . Results of the field experiment showed that dry‐matter production, number of tillers, as well as N and Mn concentrations in rice shoots of GCRPS were significantly lower than in paddy control, while there was no significant difference in shoot Fe, Cu, Zn, and P concentration and nematode populations. In the pot experiment, shoot Mn concentration significantly decreased with decreasing soil water content, while soil redox potential increased. Shoot–dry matter production and tiller number of GCRPS saturated were significantly higher than in other treatments. Significant correlations were observed between the shoot Mn concentration and tiller number at maximum tillering stage in the field and pot experiment, respectively. We therefore conclude that the limitation of Mn acquisition might contribute to the growth and yield reduction of lowland rice grown in GCRPS. The experiment provides evidence that GCRPS plastic combined with nearly water‐saturated soil conditions helps saving water and achieving optimum crop development without visual or latent Mn deficiency as observed under more aerobic conditions.
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Claims 14
Claim · model-written summary
Field GCRPS rice had significantly lower dry matter production than paddy control.
Verbatim
t0“lowland rice”
e0“dry‐matter production, number of tillers, as well as N and Mn concentrations in rice shoots of GCRPS were significantly lower than in paddy control”
Claim · model-written summary
Field GCRPS rice had significantly fewer tillers than paddy control.
Verbatim
t0“lowland rice”
e0“dry‐matter production, number of tillers, as well as N and Mn concentrations in rice shoots of GCRPS were significantly lower than in paddy control”
Claim · model-written summary
Field GCRPS rice had significantly lower shoot nitrogen concentration than paddy control.
Verbatim
t0“lowland rice”
e0“N and Mn concentrations in rice shoots of GCRPS were significantly lower than in paddy control”
Claim · model-written summary
Field GCRPS rice had significantly lower shoot manganese concentration than paddy control.
Verbatim
t0“lowland rice”
e0“N and Mn concentrations in rice shoots of GCRPS were significantly lower than in paddy control”
Claim · model-written summary
Shoot Fe, Cu and Zn concentrations did not differ significantly between GCRPS and paddy control.
Verbatim
t0“lowland rice”
e0“dry‐matter production, number of tillers, as well as N and Mn concentrations in rice shoots of GCRPS were significantly lower than in paddy control, while there was no significant difference in shoot Fe, Cu, Zn, and P concentration and nematode populations”
Claim · model-written summary
Shoot P concentration did not differ significantly between GCRPS and paddy control.
Verbatim
t0“lowland rice”
e0“dry‐matter production, number of tillers, as well as N and Mn concentrations in rice shoots of GCRPS were significantly lower than in paddy control, while there was no significant difference in shoot Fe, Cu, Zn, and P concentration and nematode populations”
Claim · model-written summary
Nematode populations did not differ significantly between GCRPS and paddy control.
- Taxon
- lowland ricet0
- Treatment
- GCRPSe0
- Outcome
- nematode populationse0
- Direction
- no significant differencee0
- Comparator
- paddy controle0
Not reportedInteractorInteractor role
Verbatim
t0“lowland rice”
e0“dry‐matter production, number of tillers, as well as N and Mn concentrations in rice shoots of GCRPS were significantly lower than in paddy control, while there was no significant difference in shoot Fe, Cu, Zn, and P concentration and nematode populations”
Claim · model-written summary
Shoot manganese concentration decreased significantly as soil water content declined in pots.
- Taxon
- lowland ricet0
- Treatment
- decreasing soil water contente0
- Outcome
- shoot Mn concentratione0
- Direction
- decreasede0
Not reportedComparator
Verbatim
t0“lowland rice”
e0“shoot Mn concentration significantly decreased with decreasing soil water content”
Claim · model-written summary
Soil redox potential increased as soil water content declined in pots.
- Taxon
- lowland ricet0
- Treatment
- decreasing soil water contente0
- Outcome
- soil redox potentiale0
- Direction
- increasede0
Not reportedComparator
Verbatim
t0“lowland rice”
e0“shoot Mn concentration significantly decreased with decreasing soil water content, while soil redox potential increased”
Claim · model-written summary
Shoot dry matter production was significantly higher under saturated GCRPS than other pot treatments.
Verbatim
t0“lowland rice”
e0“Shoot–dry matter production and tiller number of GCRPS saturated were significantly higher than in other treatments.”
Claim · model-written summary
Tiller number was significantly higher under saturated GCRPS than other pot treatments.
Verbatim
t0“lowland rice”
e0“Shoot–dry matter production and tiller number of GCRPS saturated were significantly higher than in other treatments.”
Claim · model-written summary
Shoot manganese concentration and tiller number were significantly correlated at maximum tillering in field and pot experiments.
- Taxon
- lowland ricet0
- Organ / stage
- maximum tillering stagee0
- Outcome
- tiller numbere0
- Qualifier
- shoot Mn concentratione0
Not reportedDirection
Verbatim
t0“lowland rice”
e0“Significant correlations were observed between the shoot Mn concentration and tiller number at maximum tillering stage in the field and pot experiment, respectively.”
Claim · model-written summary
The authors infer that limited manganese acquisition contributes to reduced growth and yield under GCRPS.
Verbatim
t0“lowland rice”
e0“the limitation of Mn acquisition might contribute to the growth and yield reduction of lowland rice grown in GCRPS.”
Claim · model-written summary
GCRPS plastic with nearly water saturated soil was judged to save water and support optimum crop development without observed Mn deficiency.
- Taxon
- lowland ricet0
- Treatment
- GCRPS plastic combined with nearly water‐saturated soil conditionse0
- Outcome
- optimum crop development without visual or latent Mn deficiencye0
- Comparator
- more aerobic conditionse0
Not reportedDirection
Verbatim
t0“lowland rice”
e0“GCRPS plastic combined with nearly water‐saturated soil conditions helps saving water and achieving optimum crop development without visual or latent Mn deficiency as observed under more aerobic conditions.”
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See all 10 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.