Abstract
Summary A field experiment on an alkali soil (ESP 94) studied the effect of gypsum applied at 0, 2·5, 5 and 10t/ha and zinc sulphate applied at 0, 10, 20, 30 and 40 kg/ha on the growth, yield and chemical composition of rice. The effects of gypsum and zinc applications were additive. Optimum response of rice was to 10 kg zinc sulphate/ha at the 5 and 10 t/ha gypsum levels. At low levels of gypsum, plant growth was poor owing to toxicity of Na and/or deficiency of Ca, and higher levels of zinc sulphate gave a yield response. Zinc-deficient plants had significantly lower Zn concentration but higher concentrations of Fe, Mn, Cu, Ca and Mg than the healthy plants. Application of gypsum decreased the concentration of Na, Fe and Zn in rice plants and increased the concentration of Ca, K, Mn and Cu. in plots not treated with gypsum, the Zn concentration of plants was higher but grain yield was lower than that of gypsum-treated plots. Application of zinc increased the DTPA-extractable Zn but gypsum decreased the soil sodicity and DTPA-extractable Zn in alkali soils.
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Claims 12
Claim · model-written summary
Gypsum and zinc effects on rice were additive.
- Taxon
- rice
Oryza sativat0 - Outcome
- effects of gypsum and zinc applications were additivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of gypsum and zinc applications were additive.”
t0“rice”
Claim · model-written summary
Rice had an optimum response to 10 kg zinc sulphate/ha at 5 and 10 t/ha gypsum.
- Taxon
- riceOryza sativae0
- Treatment
- 10 kg zinc sulphate/hae0
- Outcome
- Optimum responsee0
- Qualifier
- 5 and 10 t/ha gypsum levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum response of rice was to 10 kg zinc sulphate/ha at the 5 and 10 t/ha gypsum levels.”
Claim · model-written summary
Rice grew poorly at low gypsum levels, attributed to sodium toxicity or calcium deficiency.
- Taxon
- riceOryza sativat0
- Treatment
- low levels of gypsume0
- Compound
- Na and/or deficiency of Cae0
- Outcome
- plant growth was poore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low levels of gypsum, plant growth was poor owing to toxicity of Na and/or deficiency of Ca, and higher levels of zinc sulphate gave a yield response.”
t0“rice”
Claim · model-written summary
Higher zinc sulphate levels produced a yield response at low gypsum levels.
- Taxon
- riceOryza sativat0
- Treatment
- higher levels of zinc sulphatee0
- Outcome
- yield responsee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low levels of gypsum, plant growth was poor owing to toxicity of Na and/or deficiency of Ca, and higher levels of zinc sulphate gave a yield response.”
t0“rice”
Claim · model-written summary
Zinc-deficient rice had significantly lower zinc concentration than healthy rice.
- Taxon
- riceOryza sativat0
- Material
- Zinc-deficient plantse0
- Outcome
- Zn concentratione0
- Direction
- lowere0
- Comparator
- healthy plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zinc-deficient plants had significantly lower Zn concentration but higher concentrations of Fe, Mn, Cu, Ca and Mg than the healthy plants.”
t0“rice”
Claim · model-written summary
Zinc-deficient rice had higher Fe, Mn, Cu, Ca and Mg concentrations than healthy rice.
- Taxon
- riceOryza sativat0
- Outcome
- concentrations of Fe, Mn, Cu, Ca and Mge0
- Direction
- highere0
- Comparator
- healthy plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zinc-deficient plants had significantly lower Zn concentration but higher concentrations of Fe, Mn, Cu, Ca and Mg than the healthy plants.”
t0“rice”
Claim · model-written summary
Gypsum reduced rice Na, Fe and Zn concentrations.
- Taxon
- riceOryza sativae0
- Treatment
- gypsume0
- Outcome
- concentration of Na, Fe and Zne0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of gypsum decreased the concentration of Na, Fe and Zn in rice plants and increased the concentration of Ca, K, Mn and Cu.”
Claim · model-written summary
Gypsum increased rice Ca, K, Mn and Cu concentrations.
- Taxon
- riceOryza sativae0
- Treatment
- gypsume0
- Outcome
- concentration of Ca, K, Mn and Cue0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of gypsum decreased the concentration of Na, Fe and Zn in rice plants and increased the concentration of Ca, K, Mn and Cu.”
Claim · model-written summary
Without gypsum rice had higher zinc concentration than gypsum-treated rice.
- Taxon
- riceOryza sativat0
- Treatment
- plots not treated with gypsume0
- Outcome
- Zn concentration of plantse0
- Direction
- highere0
- Comparator
- gypsum-treated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in plots not treated with gypsum, the Zn concentration of plants was higher but grain yield was lower than that of gypsum-treated plots.”
t0“rice”
Claim · model-written summary
Without gypsum rice had lower grain yield than gypsum-treated rice.
- Taxon
- riceOryza sativat0
- Treatment
- plots not treated with gypsume0
- Outcome
- grain yielde0
- Direction
- lowere0
- Comparator
- gypsum-treated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in plots not treated with gypsum, the Zn concentration of plants was higher but grain yield was lower than that of gypsum-treated plots.”
t0“rice”
Claim · model-written summary
Zinc application increased soil DTPA-extractable zinc.
Not reportedTaxonComparator
Verbatim
e0“Application of zinc increased the DTPA-extractable Zn but gypsum decreased the soil sodicity and DTPA-extractable Zn in alkali soils.”
Claim · model-written summary
Gypsum decreased soil sodicity and DTPA-extractable zinc.
Not reportedTaxonComparator
Verbatim
e0“Application of zinc increased the DTPA-extractable Zn but gypsum decreased the soil sodicity and DTPA-extractable Zn in alkali soils.”
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See all 136 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.