Abstract
Abstract Soil pot culture experiment was conducted on 22 soils of Balewal‐Phaguwala‐Narike (BPN) and 24 soils of Isri‐Langrian‐Narike (ILN) associations using rice (PR 106) as test crop at 0 and 7.5 ppm Zn levels. Chelating extractants 0.005M DTPA, 0.01M EDTA‐(NH4)2CO3 and 0.05M EDTA, extracted more soil Zn than double‐acid and were significantly correlated with each other as well as with soil pH and clay in BPN and only with clay in ILN soil association. Soil CaCO3 governed the double‐acid extractable Zn in these soils. Dry matter yield and Zn uptake by rice significantly increased with 7.5 ppm Zn application. The response was higher in ILN than BPN soil association, The DTPA method gave the highest correlation with Bray's yield and Zn uptake (r =0.72 and 0.55) followed by 0.05M EDTA (r ‐ 0.75 and 0.61) or EDTA‐(NH4)2CO3 (r =0.70 and 0.61). The predictability of rice yield improved from 18–27 to 27–35, 32–43, 34–44 and 51–55 percent as a result of stepwise inclusion of pH, CaCO3, organic carbon (OC) and clay respectively in the regression equation alongwith Zn extracted by chelating agents. The critical levels of DTPA, EDTA‐(NH4)2CO3 and EDTA extractable Zn significantly differed in the two associations and were 0.69, 0.82 and 1.24 ppm in BPN and O.BC, 1.09 and 1.42 ppm in ILN soil association. Soil properties further affected the critical levels. This for DTPA available Zn was 0.80 and 1.03 ppm in soil containing less and greater than 2% CaCO3, 1.03 and 0.80 ppm in soils containing less and greater than 0.25% OC. These values for EDTA‐(NH4)2CO3 available Zn were 1.09 and 0.91 ppm Zn in soils containing less and greater than 15% clay suggesting that critical levels of Zn for each category of soil properties should be considered while making recommendations of Zn fertilization of crops.,
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Claims 7
Claim · model-written summary
Chelating extractants removed more soil zinc than double acid.
Verbatim
e0“Chelating extractants 0.005M DTPA, 0.01M EDTA‐(NH4)2CO3 and 0.05M EDTA, extracted more soil Zn than double‐acid”
Claim · model-written summary
Rice dry matter yield rose with zinc application.
- Taxon
- rice
Oryza sativae0 - Treatment
- 7.5 ppm Zn applicatione0
- Outcome
- Dry matter yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter yield and Zn uptake by rice significantly increased with 7.5 ppm Zn application.”
Claim · model-written summary
Rice zinc uptake rose with zinc application.
- Taxon
- riceOryza sativae0
- Treatment
- 7.5 ppm Zn applicatione0
- Outcome
- Zn uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter yield and Zn uptake by rice significantly increased with 7.5 ppm Zn application.”
Claim · model-written summary
Rice response was greater in ILN than BPN soils.
Not reportedTaxon
Verbatim
e0“The response was higher in ILN than BPN soil association”
Claim · model-written summary
DTPA had the highest reported correlation with Bray yield and zinc uptake.
Verbatim
e0“The DTPA method gave the highest correlation with Bray's yield and Zn uptake (r =0.72 and 0.55)”
Claim · model-written summary
Adding soil properties improved rice yield predictability.
- Taxon
- riceOryza sativae0
- Outcome
- predictability of rice yielde0
- Value
- 51–55 percente0
- Comparator
- 18–27e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The predictability of rice yield improved from 18–27 to 27–35, 32–43, 34–44 and 51–55 percent as a result of stepwise inclusion of pH, CaCO3, organic carbon (OC) and clay respectively”
Claim · model-written summary
Critical zinc test levels differed between the soil associations.
Verbatim
e0“The critical levels of DTPA, EDTA‐(NH4)2CO3 and EDTA extractable Zn significantly differed in the two associations”
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