Abstract
Crop modelling can facilitate researchers' ability to understand and interpret experimental results, and to diagnose yield gaps. In this paper, the Decision Support Systems for Agrotechnology Transfer 4.6 (DSSAT) model together with the CENTURT soil model were employed to investigate the effect of low nitrogen (N) input on wheat (Triticum aestivum L.) yield, grain N concentration and soil organic carbon (SOC) in a long-term experiment (19 years) under a wheat-maize (Zea mays L.) rotation at Changping, Beijing, China. There were two treatments including N0 (no N application) and N150 (150 kg N ha−1) before wheat and maize planting, with phosphorus (P) and potassium (K) basal fertilizers applied as 75 kg P2O5 ha−1 and 37.5 kg K2O ha−1, respectively. The DSSAT-CENTURY model was able to satisfactorily simulate measured wheat grain yield and grain N concentration at N0, but could not simulate these parameters at N150, or SOC in either N treatment. Model simulation and field measurement showed that N application (N150) increased wheat yield compared to no N application (N0). The results indicated that inorganic fertilizer application at the rates used did not maintain crop yield and SOC levels. It is suggested that if the DSSAT is calibrated carefully, it can be a useful tool for assessing and predicting wheat yield, grain N concentration, and SOC trends under wheat-maize cropping systems.
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Claims 5
Claim · model-written summary
The DSSAT-CENTURY model satisfactorily simulated measured wheat grain yield and grain N concentration at N0.
- Taxon
- wheat
Triticum aestivume1 - Outcome
- grain yield and grain N concentratione1
- Qualifier
- at N0e1
- Comparator
- measurede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The DSSAT-CENTURY model was able to satisfactorily simulate measured wheat grain yield and grain N concentration at N0, but could not simulate these parameters at N150, or SOC in either N treatment”
t0“simulate wheat yield”
Claim · model-written summary
The DSSAT-CENTURY model could not simulate wheat grain yield, grain N concentration or SOC at N150 or SOC in either N treatment.
- Taxon
- wheatTriticum aestivume1
- Outcome
- these parameterse1
- Qualifier
- at N150, or SOC in either N treatmente1
- Comparator
- N0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The DSSAT-CENTURY model was able to satisfactorily simulate measured wheat grain yield and grain N concentration at N0, but could not simulate these parameters at N150, or SOC in either N treatment”
t0“simulate wheat yield”
Claim · model-written summary
Model simulation and field measurement showed that N application at 150 kg N/ha increased wheat yield compared with no N application.
- Taxon
- wheatTriticum aestivume2
- Treatment
- N application (N150)e2
- Outcome
- wheat yielde2
- Direction
- increasede2
- Comparator
- no N application (N0)e2
- Setting
- Changping, Beijing, Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Changping, Beijing, China”
e2“Model simulation and field measurement showed that N application (N150) increased wheat yield compared to no N application (N0)”
t0“simulate wheat yield”
Claim · model-written summary
Inorganic fertilizer application at the rates used did not maintain wheat crop yield and SOC levels.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- inorganic fertilizer application at the rates usede3
- Outcome
- crop yield and SOC levelse3
- Direction
- did not maintaine3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The results indicated that inorganic fertilizer application at the rates used did not maintain crop yield and SOC levels”
t0“simulate wheat yield”
Claim · model-written summary
DSSAT may be a useful tool for assessing and predicting wheat yield, if the model is calibrated carefully.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- a useful tool for assessing and predicting wheat yielde5
- Qualifier
- if the DSSAT is calibrated carefullye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“if the DSSAT is calibrated carefully, it can be a useful tool for assessing and predicting wheat yield”
t0“simulate wheat yield”
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