Abstract
A field trial was conducted in 2007 and 2008 to investigate the difference in soil nutrients and grain yield of spring wheat ( Triticum aestivum ) as influenced by regulated deficit irrigation (RDI) in an arid area. Three RDI treatments and a no-water-deficit control (CK) were designed to subject wheat to various degrees of soil water deficit at different crop developmental stages. Significant differences (p<0.05) occurred in soil organic matter (SOM) and soil available potassium (SAK) contents in both growing seasons, but no difference (p>0.05) occurred among the RDI treatments. Meanwhile, no differences were found in soil total nitrogen (STN) and soil total phosphorus (STP) contents among the treatments and CK. SOM content was improved by 6.2% to 7.2% in RDI treatments than in the CK over the two growing seasons, while the STN, STP, and SAK contents were increased by 1.2% to 2.5%, 1.4% to 5.6%, and 9.0% to 11.2%, respectiely. The STP (t=10.900, p<0.001), soil available phosphorus (SAP, t=8.894, p<0.001), and SAK (t=11.706, p<0.001) contents in 0~40 cm soil layer at wheat harvest were significantly lower in 2008 than in 2007, while the SOM (t=-2.513, p<0.05) and STN (t=-9.950, p<0.001) contents were significantly higher in 2008. Soil organic C, STN, and SAP balance was greatly influenced by RDI in two growing seasons. Compared to the no-water-deficit control, grain yields over the two years were respectively improved by 16.5% to 24.9% in RDI plots.The relationship between grain yield and the soil nutrients was described as y=15843.4 +713.3SOM-20989.1STN+38.7SAN-15.0SAP-39.7SAK (R 2 =1, p<0.001).
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Claims 5
Claim · model-written summary
Regulated deficit irrigation raised soil organic matter by 6.2% to 7.2% versus the control.
- Taxon
- Triticum aestivum
Triticum aestivumt0 - Treatment
- RDI treatmentse0
- Outcome
- SOM contente0
- Direction
- improvede0
- Value
- 6.2% to 7.2%e0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOM content was improved by 6.2% to 7.2% in RDI treatments than in the CK over the two growing seasons”
t0“Spring Wheat (Triticum aestivum)”
Claim · model-written summary
RDI raised soil total nitrogen by 1.2% to 2.5%.
- Taxon
- Triticum aestivumTriticum aestivumt0
- Outcome
- STNe0
- Direction
- increasede0
- Value
- 1.2% to 2.5%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the STN, STP, and SAK contents were increased by 1.2% to 2.5%, 1.4% to 5.6%, and 9.0% to 11.2%, respectiely”
t0“Spring Wheat (Triticum aestivum)”
Claim · model-written summary
RDI raised soil total phosphorus by 1.4% to 5.6%.
Not reportedTaxon
Verbatim
e0“the STN, STP, and SAK contents were increased by 1.2% to 2.5%, 1.4% to 5.6%, and 9.0% to 11.2%, respectiely”
Claim · model-written summary
RDI raised soil available potassium by 9.0% to 11.2%.
Not reportedTaxon
Verbatim
e0“the STN, STP, and SAK contents were increased by 1.2% to 2.5%, 1.4% to 5.6%, and 9.0% to 11.2%, respectiely”
Claim · model-written summary
Grain yields in RDI plots improved by 16.5% to 24.9% versus the control.
- Treatment
- RDIe0
- Outcome
- grain yieldse0
- Direction
- improvede0
- Value
- 16.5% to 24.9%e0
- Comparator
- no-water-deficit controle0
Not reportedTaxon
Verbatim
e0“Compared to the no-water-deficit control, grain yields over the two years were respectively improved by 16.5% to 24.9% in RDI plots”
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