Abstract
A greenhouse experiment was conducted with an acid soil, with and without lime, pretreated with cadmium at rates up to 10.0 micrograms per gram of soil in factorial combination with low to high amounts of copper, nickel, and zinc. The treated soils were placed in sealed pots, flooded, and cropped to rice under flooded management to have a measure of Cd availability at low addition rates, as influenced by low to high addition rates of Cu, Ni, and Zn under unlimed and limed conditions. Yield of rice grain was related to metal treatments and soil pH through multiple regression analysis. The most significant equation revealed the parameters influencing grain yields to be only soil pH and the Cu addition rate (combining the unlimed and limed soil experiments). Disregarding the high Ni treatment, we found the Cd content of rice grain to be dependent upon the Cd addition rate and soil pH only; additions of Cu, Ni, and Zn had no significant effect on Cd uptake and accumulation in rice grain. The maximum permissible Cd addition rate was found to be strongly pH dependent.
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Claims 4
Claim · model-written summary
Rice grain yield was influenced by soil pH and copper addition rate.
Not reportedTaxonSettingDirection
Verbatim
e0“parameters influencing grain yields to be only soil pH and the Cu addition rate”
Claim · model-written summary
Rice grain cadmium content depended on cadmium addition rate and soil pH except under high nickel treatment.
- Taxon
- rice
Oryza sativae0 - Treatment
- Cd addition ratee0
- Outcome
- Cd content of rice graine0
- Direction
- dependent upone0
- Qualifier
- Disregarding the high Ni treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disregarding the high Ni treatment, we found the Cd content of rice grain to be dependent upon the Cd addition rate and soil pH only”
Claim · model-written summary
Copper, nickel and zinc additions had no significant effect on rice grain cadmium uptake and accumulation.
- Taxon
- riceOryza sativae0
- Treatment
- additions of Cu, Ni, and Zne0
- Outcome
- Cd uptake and accumulation in rice graine0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“additions of Cu, Ni, and Zn had no significant effect on Cd uptake and accumulation in rice grain”
Claim · model-written summary
Maximum permissible cadmium addition rate depended strongly on soil pH.
- Taxon
- riceOryza sativae1
- Treatment
- Cd addition ratee0
- Outcome
- maximum permissible Cd addition ratee0
- Direction
- strongly pH dependente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum permissible Cd addition rate was found to be strongly pH dependent”
e1“Cd content of rice grain”
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