Abstract
Long-term use of nitrogen (N) fertilizers can lead to fertility-lowering soil chemical changes. To examine this in geologically young soils in the northern Great Plains of North America, we present near-surface (0–7.6 cm) soil chemistry data from 16 years of two crop rotations: continuous crop (CC; spring wheat [Triticum aestivum L.]—winter wheat [T. aestivum]—sunflower [Helianthus annuus L.]) and crop-fallow (C-F; spring wheat—fallow) that underwent factorial tillage (none, minimum, conventional) and N rate (low, medium, high) treatments. For CC, the N rate (but not tillage) had a significant effect on pH, with the high N rate leading to the largest pH decline (−0.76). The nitrogen rate also had a significant effect on cation exchange capacity (CEC) for CC, whereby CEC increased with the N rate. Managers utilizing high N rates should be aware of the potential for soil acidification, even in the northern Great Plains of North America.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
In continuous crop rotations, N rate significantly affected soil pH, with the high N rate giving the largest pH decline (-0.76).
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous crop (CC; spring wheat [Triticum aestivum L.]—winter wheat [T. aestivum]—sunflower [Helianthus annuus L.])”
e1“the N rate (but not tillage) had a significant effect on pH, with the high N rate leading to the largest pH decline (−0.76)”
Claim · model-written summary
In continuous crop rotations, tillage had no significant effect on soil pH.
- Taxon
- spring wheat
Triticum aestivume0 - Treatment
- tillagee1
- Outcome
- pHe1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous crop (CC; spring wheat [Triticum aestivum L.]—winter wheat [T. aestivum]—sunflower [Helianthus annuus L.])”
e1“the N rate (but not tillage) had a significant effect on pH”
Claim · model-written summary
For continuous crop rotations, cation exchange capacity increased with N rate.
- Taxon
- spring wheatTriticum aestivume0
- Treatment
- nitrogen ratee1
- Outcome
- cation exchange capacity (CEC)e1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous crop (CC; spring wheat [Triticum aestivum L.]—winter wheat [T. aestivum]—sunflower [Helianthus annuus L.])”
e1“The nitrogen rate also had a significant effect on cation exchange capacity (CEC) for CC, whereby CEC increased with the N rate”
Claim · model-written summary
Managers using high N rates should be aware of the potential for soil acidification.
- Outcome
- potential for soil acidificatione0
Not reportedTaxon
Verbatim
e0“Managers utilizing high N rates should be aware of the potential for soil acidification”
The same questions in other papers
nitrogen · soil: chemistry · Triticum aestivum (wheat)Positive and negative results
10 papers in the same direction as this paper · 38 in the opposite direction
- positive
- positive
- positive
45 papers more in this group
See all 49 papers →tillage · soil: chemistry · Triticum aestivum (wheat)Positive and negative results
5 papers in the same direction as this paper · 50 in the opposite direction
- positive
- positive
- positive
52 papers more in this group
See all 56 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.