Abstract
To investigate the effect of low soil pH caused by fertilization on soil available zinc in calcareous soil, this study was conducted based on a long-term experiment consisting of: (a) no fertilization (CT); (b) mineral fertilizer application coupled with 7500 kg/ha of wheat straw (WS-NPK); (c) mineral fertilizer application coupled with 3750 kg/ha of wheat straw (1/2WS-NPK); (d) mineral fertilizer application alone (NPK). Long-term fertilization results in a significant increase in soil DTPA-extractable zinc. However, the increased soil DTPA-extractable zinc is unavailable to crops and mainly confined to 0.25 mm > and 0.25 mm to 1 mm aggregates. Compared to CT, soil DTPA-extractable zinc under fertilization is more than 9.67% and 122.36% higher in 0.25 mm > and 0.25 mm to 1 mm aggregates, respectively. Furthermore, plant-available zinc in the 0-15 cm soil layer and wheat grain zinc are both significantly positive related to soil DTPA-extractable zinc in > 2 mm aggregates. Therefore, plant-available zinc in the 0-15 cm layer is closely associated with DTPA-extractable zinc in > 2 mm aggregates, and the low soil pH caused by long-term fertilization could not enhance plant-available zinc in the surface soil layer nor elevate wheat grain zinc concentration because of the occlusive effect of soil aggregates.
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Claims 6
Claim · model-written summary
Long-term fertilization significantly increased soil DTPA-extractable zinc
- Taxon
- wheat
Triticum aestivume4 - Treatment
- Long-term fertilizatione1
- Outcome
- soil DTPA-extractable zince1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the low soil pH caused by long-term fertilization could not enhance plant-available zinc in the surface soil layer nor elevate wheat grain zinc concentration because of the occlusive effect of soil aggregates”
e1“Long-term fertilization results in a significant increase in soil DTPA-extractable zinc”
Claim · model-written summary
Soil DTPA-extractable zinc under fertilization was 9.67% higher than control in the 0.25 mm and larger aggregates
- Taxon
- wheatTriticum aestivume4
- Treatment
- fertilizatione2
- Outcome
- soil DTPA-extractable zince2
- Direction
- highere2
- Value
- 9.67%e2
- Qualifier
- 0.25 mm >e2
- Comparator
- CTe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the low soil pH caused by long-term fertilization could not enhance plant-available zinc in the surface soil layer nor elevate wheat grain zinc concentration because of the occlusive effect of soil aggregates”
e2“Compared to CT, soil DTPA-extractable zinc under fertilization is more than 9.67% and 122.36% higher in 0.25 mm > and 0.25 mm to 1 mm aggregates, respectively”
Claim · model-written summary
Soil DTPA-extractable zinc under fertilization was 122.36% higher than control in 0.25 to 1 mm aggregates
- Taxon
- wheatTriticum aestivume4
- Treatment
- fertilizatione2
- Outcome
- soil DTPA-extractable zince2
- Direction
- highere2
- Value
- 122.36%e2
- Qualifier
- 0.25 mm to 1 mme2
- Comparator
- CTe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the low soil pH caused by long-term fertilization could not enhance plant-available zinc in the surface soil layer nor elevate wheat grain zinc concentration because of the occlusive effect of soil aggregates”
e2“Compared to CT, soil DTPA-extractable zinc under fertilization is more than 9.67% and 122.36% higher in 0.25 mm > and 0.25 mm to 1 mm aggregates, respectively”
Claim · model-written summary
Plant-available zinc in the 0-15 cm soil layer and wheat grain zinc are significantly positively related to DTPA-extractable zinc in aggregates larger than 2 mm
- Taxon
- wheatTriticum aestivume3
- Compound
- DTPA-extractable zince3
- Outcome
- plant-available zinc in the 0-15 cm soil layer and wheat grain zince3
- Direction
- significantly positive relatede3
- Qualifier
- in > 2 mm aggregatese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“plant-available zinc in the 0-15 cm soil layer and wheat grain zinc are both significantly positive related to soil DTPA-extractable zinc in > 2 mm aggregates”
Claim · model-written summary
Low soil pH from long-term fertilization could not enhance plant-available zinc in the surface soil layer
- Taxon
- wheatTriticum aestivume4
- Treatment
- low soil pH caused by long-term fertilizatione4
- Outcome
- plant-available zinc in the surface soil layere4
- Direction
- could not enhancee4
- Qualifier
- because of the occlusive effect of soil aggregatese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the low soil pH caused by long-term fertilization could not enhance plant-available zinc in the surface soil layer nor elevate wheat grain zinc concentration because of the occlusive effect of soil aggregates”
Claim · model-written summary
Low soil pH from long-term fertilization did not elevate wheat grain zinc concentration
- Taxon
- wheatTriticum aestivume4
- Treatment
- low soil pH caused by long-term fertilizatione4
- Outcome
- wheat grain zinc concentratione4
- Direction
- nor elevatee4
- Qualifier
- because of the occlusive effect of soil aggregatese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the low soil pH caused by long-term fertilization could not enhance plant-available zinc in the surface soil layer nor elevate wheat grain zinc concentration because of the occlusive effect of soil aggregates”
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