Abstract
Micronutrient availability can be affected by the increase of the soil pH due to surface liming. A field trial was carried out on a loamy, kaolinitic, thermic Typic Hapludox at Ponta Grossa, Paraná State, Brazil. The main objective was to evaluate the effects of surface liming and re-liming on the availability of micronutrients [copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn)] for wheat (Triticum aestivum L.) cropped under a no-till system. A randomized complete block design was used in a split-plot arrangement. The main plots received surface lime applications (2, 4, and 6 Mg ha-1) in July 1993. In the subplots, surface lime (3 Mg ha-1) was applied again in June 2000. In 2003, before the wheat sowing, soil samples were taken at 0-5, 5-10, and 10-20 cm layers. Soil cationic micronutrients concentrations using different extractants (DTPA-TEA, Mehlich-1, HCl, and Mehlich-3) and solution/soil ratios were determined. Application of lime increased soil pH at 0-5, 5-10, and 10-20 cm. The increase in soil pH by liming did not affect soil organic carbon content. The Mehlich-3 solution had a greater capacity in extracting soil micronutrients. Increasing solution/soil ratio of the DTPA-TEA, Mehlich-1, and HCl solutions generally increased the extraction of Cu, Fe, Mn, and Zn. Liming and re-liming caused a decrease in Mn concentration in the wheat leaves. Leaf concentrations of Cu, Fe and Zn were not affected by liming treatments. The solutions of DTPA-TEA, Mehlich-1, HCl, and Mehlich-3 were ineffective to predict the soil cationic micronutrients availability for a wheat crop after surface application of lime.
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Claims 7
Claim · model-written summary
Surface lime increased soil pH across three sampled depths.
- Treatment
- Application of limee0
- Outcome
- soil pHe0
- Direction
- increasede0
- Qualifier
- 0-5, 5-10, and 10-20 cme0
Not reportedTaxonComparator
Verbatim
e0“Application of lime increased soil pH at 0-5, 5-10, and 10-20 cm.”
Claim · model-written summary
Liming did not affect soil organic carbon content.
Not reportedTaxonComparator
Verbatim
e0“The increase in soil pH by liming did not affect soil organic carbon content.”
Claim · model-written summary
Mehlich-3 extracted more soil micronutrients.
Not reportedComparatorValue
Verbatim
e0“The Mehlich-3 solution had a greater capacity in extracting soil micronutrients.”
Claim · model-written summary
Increasing extractant solution-to-soil ratio generally increased Cu, Fe, Mn and Zn extraction.
- Treatment
- Increasing solution/soil ratioe0
- Outcome
- extraction of Cu, Fe, Mn, and Zne0
- Direction
- increasede0
Not reportedTaxonComparator
Verbatim
e0“Increasing solution/soil ratio of the DTPA-TEA, Mehlich-1, and HCl solutions generally increased the extraction of Cu, Fe, Mn, and Zn.”
Claim · model-written summary
Liming and re-liming decreased Mn in wheat leaves.
- Taxon
- wheat
Triticum aestivume0 - Organ / stage
- leavese0
- Treatment
- Liming and re-liminge0
- Outcome
- Mn concentratione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Liming and re-liming caused a decrease in Mn concentration in the wheat leaves.”
Claim · model-written summary
Liming treatments did not affect wheat leaf Cu, Fe and Zn concentrations.
Not reportedTaxonComparator
Verbatim
e0“Leaf concentrations of Cu, Fe and Zn were not affected by liming treatments.”
Claim · model-written summary
Four extraction solutions failed to predict micronutrient availability for wheat after surface liming.
- Taxon
- wheatTriticum aestivume0
- Outcome
- soil cationic micronutrients availabilitye0
- Qualifier
- ineffective to predicte0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The solutions of DTPA-TEA, Mehlich-1, HCl, and Mehlich-3 were ineffective to predict the soil cationic micronutrients availability for a wheat crop after surface application of lime.”
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