Abstract
Abstract The yield of rice was significantly reduced when the soil reaction exceeded pH 7.0. Further significant yield decreases were obtained when Crowley silt loam was adjusted to pH 7.5 with, dolomitic limestone. A highly significant quadratic relationship was found between the yield of rice and soil reaction (pH). The soil pH accounted for 45.77. of the variability in yield. A highly significant positive linear relationship was found between yield and Zn extracted from the soil with DTPA‐TEA. Extractable Zn accounted for 42.2% of the variability in yield. Significantly lower rice yields were obtained on soils that did not receive supplementary Zn and contained less than 1 ppm of extractable Zn. Increasing the soil reaction from pH 6.5 to pH 8.0 resulted in a significant linear reduction in Zn extracted from the Crowley soil with DTPA‐TEA. A critically low level of soil‐Zn was found when the soil reaction was adjusted to pH 7.5 and no Zn was applied. A highly significant curvilinear relationship was found between the concentration of Zn in rice leaves and extractable soil‐Zn. Approximately 23% of the variability of leaf‐Zn was accounted for in the extractable Zn content of the soil. Data were presented that indicated that DTPA‐TEA extractable soil‐Zn and the Zn concentration in the ‘leaves of rice plants at the 2 mm panicle stage of development may be used as an effective diagnositc technique in determining the Zn‐nutrient status of the soil and plant.
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Claims 12
Claim · model-written summary
Rice yield fell significantly above soil pH 7.0.
- Taxon
- rice
Oryza sativae0 - Treatment
- soil reaction exceeded pH 7.0e0
- Outcome
- yielde0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of rice was significantly reduced when the soil reaction exceeded pH 7.0.”
Claim · model-written summary
Liming Crowley silt loam to pH 7.5 further reduced rice yield.
- Taxon
- rice plantsOryza sativat0
- Treatment
- dolomitic limestonee0
- Outcome
- yielde0
- Direction
- decreasese0
- Setting
- Crowley silt loame0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further significant yield decreases were obtained when Crowley silt loam was adjusted to pH 7.5 with, dolomitic limestone.”
t0“rice plants”
Claim · model-written summary
Rice yield had a significant quadratic relationship with soil pH.
- Taxon
- riceOryza sativae0
- Treatment
- soil reaction (pH)e0
- Outcome
- yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A highly significant quadratic relationship was found between the yield of rice and soil reaction (pH).”
Claim · model-written summary
Soil pH explained 45.77. of rice yield variability.
- Taxon
- rice plantsOryza sativat0
- Treatment
- soil pHe0
- Outcome
- variability in yielde0
- Value
- 45.77.e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soil pH accounted for 45.77. of the variability in yield.”
t0“rice plants”
Claim · model-written summary
Rice yield was positively linearly related to extractable soil zinc.
- Taxon
- rice plantsOryza sativat0
- Compound
- Zne0
- Outcome
- yielde0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A highly significant positive linear relationship was found between yield and Zn extracted from the soil with DTPA‐TEA.”
t0“rice plants”
Claim · model-written summary
Extractable zinc explained 42.2% of rice yield variability.
- Taxon
- rice plantsOryza sativat0
- Compound
- Extractable Zne0
- Outcome
- variability in yielde0
- Value
- 42.2%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extractable Zn accounted for 42.2% of the variability in yield.”
t0“rice plants”
Claim · model-written summary
Without supplemental zinc, soils below 1 ppm extractable zinc produced significantly lower rice yield.
- Taxon
- riceOryza sativae0
- Treatment
- did not receive supplementary Zne0
- Outcome
- rice yieldse0
- Direction
- lowere0
- Qualifier
- less than 1 ppm of extractable Zne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significantly lower rice yields were obtained on soils that did not receive supplementary Zn and contained less than 1 ppm of extractable Zn.”
Claim · model-written summary
Raising soil pH from 6.5 to 8.0 significantly reduced extractable zinc in Crowley soil.
- Treatment
- Increasing the soil reaction from pH 6.5 to pH 8.0e0
- Outcome
- Zn extracted from the Crowley soile0
- Direction
- reductione0
- Comparator
- pH 6.5e0
Not reportedTaxon
Verbatim
e0“Increasing the soil reaction from pH 6.5 to pH 8.0 resulted in a significant linear reduction in Zn extracted from the Crowley soil with DTPA‐TEA.”
Claim · model-written summary
Soil zinc was critically low at pH 7.5 without added zinc.
- Treatment
- soil reaction was adjusted to pH 7.5 and no Zn was appliede0
- Outcome
- critically low level of soil‐Zne0
Not reportedTaxon
Verbatim
e0“A critically low level of soil‐Zn was found when the soil reaction was adjusted to pH 7.5 and no Zn was applied.”
Claim · model-written summary
Leaf zinc concentration had a significant curved relationship with extractable soil zinc.
- Taxon
- riceOryza sativae0
- Compound
- extractable soil‐Zne0
- Outcome
- concentration of Zn in rice leavese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A highly significant curvilinear relationship was found between the concentration of Zn in rice leaves and extractable soil‐Zn.”
Claim · model-written summary
Extractable soil zinc explained approximately 23% of leaf zinc variability.
- Taxon
- rice plantsOryza sativat0
- Compound
- extractable Zne0
- Outcome
- variability of leaf‐Zne0
- Value
- 23%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Approximately 23% of the variability of leaf‐Zn was accounted for in the extractable Zn content of the soil.”
t0“rice plants”
Claim · model-written summary
Soil extractable zinc and rice leaf zinc at the 2 mm panicle stage may diagnose zinc nutrient status.
- Taxon
- rice plantsOryza sativae0
- Organ / stage
- 2 mm panicle stage of developmente0
- Outcome
- Zn‐nutrient status of the soil and plante0
- Comparator
- DTPA‐TEA extractable soil‐Zne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DTPA‐TEA extractable soil‐Zn and the Zn concentration in the ‘leaves of rice plants at the 2 mm panicle stage of development may be used as an effective diagnositc technique in determining the Zn‐nutrient status of the soil and plant.”
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