Abstract
In this study, the mentioned model was evaluated and modified for simulation of winter wheat (Sabalan cul.) under irrigated and rainfed conditions in Maragheh area (Eastern Azarbayejan province) of Iran for three consecutive crop years (1999 - 2000 to 2001 -2002). The simulated and measured grain yields were compared. Results show that the model was simulated satisfactory for the grain yield under irrigated condition, but the model was not able to simulate the grain yield under rainfed condition. The simulated grain yield was less than observed values under rainfed condition and it sounded that soil water content in this condition was simulated lower. Therefore, the coefficient of soil readily available water was changed from 0.65 to 0.90 for rainfed grain yield simulation. The model was able to predict more available water for plant transpiration using this scheme. The modified model properly simulated the grain yield under rainfed condition. Furthermore, it was found that this model was not able to simulate the grain yield for crop year (2001 - 2002) with high rainfall during the growing season in spring and summer due to plant disease infection. The amount of this rainfall was more than 140 mm and the model was modified for this parameter. Therefore, the modified model for excess rain was able to simulate the grain yield of Sabalan winter wheat under irrigated and rainfed conditions in the Maragheh area even for years with high rainfall during the growing season in spring and summer. Finally, the modified model was validated by data obtained for Alamoot cultivar and the results indicated that there was no significant differences at 5% level between measured and predicted grain yield. Key words: Crop modeling, grain yield simulation, winter wheat cultivar.
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Claims 8
Claim · model-written summary
The model simulated grain yield of winter wheat satisfactorily under irrigated conditions.
- Taxon
- winter wheat
Triticum aestivume0 - Material
- Sabalan cul.e0
- Treatment
- irrigated conditione2
- Outcome
- grain yielde2
- Comparator
- measured grain yieldse1
- Setting
- Maragheh area (Eastern Azarbayejan province) of Irane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Evaluation and modification of model for the prediction of wheat yield at Iran region”
e0“simulation of winter wheat (Sabalan cul.) under irrigated and rainfed conditions in Maragheh area (Eastern Azarbayejan province) of Iran”
e1“The simulated and measured grain yields were compared”
e2“Results show that the model was simulated satisfactory for the grain yield under irrigated condition, but the model was not able to simulate the grain yield under rainfed condition”
Claim · model-written summary
The model could not simulate grain yield of winter wheat under rainfed conditions.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Sabalan cul.e0
- Treatment
- rainfed conditione2
- Outcome
- grain yielde2
- Comparator
- measured grain yieldse1
- Setting
- Maragheh area (Eastern Azarbayejan province) of Irane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Evaluation and modification of model for the prediction of wheat yield at Iran region”
e0“simulation of winter wheat (Sabalan cul.) under irrigated and rainfed conditions in Maragheh area (Eastern Azarbayejan province) of Iran”
e1“The simulated and measured grain yields were compared”
e2“Results show that the model was simulated satisfactory for the grain yield under irrigated condition, but the model was not able to simulate the grain yield under rainfed condition”
Claim · model-written summary
Simulated grain yield of winter wheat under rainfed conditions was lower than observed values.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Sabalan cul.e0
- Treatment
- rainfed conditione4
- Outcome
- simulated grain yielde4
- Direction
- lesse4
- Comparator
- observed valuese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“simulation of winter wheat (Sabalan cul.) under irrigated and rainfed conditions in Maragheh area (Eastern Azarbayejan province) of Iran”
e4“The simulated grain yield was less than observed values under rainfed condition”
Claim · model-written summary
Changing the soil readily available water coefficient from 0.65 to 0.90 was used for rainfed grain yield simulation.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Sabalan cul.e0
- Treatment
- coefficient of soil readily available watere5
- Outcome
- rainfed grain yield simulatione5
- Value
- 0.65 to 0.90e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“simulation of winter wheat (Sabalan cul.) under irrigated and rainfed conditions in Maragheh area (Eastern Azarbayejan province) of Iran”
e5“the coefficient of soil readily available water was changed from 0.65 to 0.90 for rainfed grain yield simulation”
Claim · model-written summary
The modified model properly simulated rainfed grain yield of winter wheat.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Sabalan cul.e0
- Treatment
- rainfed conditione6
- Outcome
- grain yielde6
- Comparator
- measured grain yieldse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“simulation of winter wheat (Sabalan cul.) under irrigated and rainfed conditions in Maragheh area (Eastern Azarbayejan province) of Iran”
e1“The simulated and measured grain yields were compared”
e6“The modified model properly simulated the grain yield under rainfed condition”
Claim · model-written summary
The model could not simulate grain yield in the high-rainfall crop year 2001-2002, attributed to plant disease infection with rainfall above 140 mm.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Sabalan cul.e0
- Treatment
- high rainfall during the growing season in spring and summere7
- Outcome
- grain yielde7
- Value
- more than 140 mme2
- Qualifier
- due to plant disease infectione7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“simulation of winter wheat (Sabalan cul.) under irrigated and rainfed conditions in Maragheh area (Eastern Azarbayejan province) of Iran”
e7“it was found that this model was not able to simulate the grain yield for crop year (2001 - 2002) with high rainfall during the growing season in spring and summer due to plant disease infection”
e2“The amount of this rainfall was more than 140 mm”
Claim · model-written summary
The modified model for excess rain simulated grain yield under irrigated and rainfed conditions even in years with high rainfall.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Sabalan cul.e0
- Treatment
- excess raine2
- Outcome
- grain yielde2
- Comparator
- measured grain yieldse1
- Setting
- Maragheh areae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“simulation of winter wheat (Sabalan cul.) under irrigated and rainfed conditions in Maragheh area (Eastern Azarbayejan province) of Iran”
e1“The simulated and measured grain yields were compared”
e2“the modified model for excess rain was able to simulate the grain yield of Sabalan winter wheat under irrigated and rainfed conditions in the Maragheh area even for years with high rainfall during the growing season in spring and summer”
Claim · model-written summary
The modified model validated on Alamoot cultivar showed no significant difference from measured grain yield at the 5% level.
- Taxon
- wheatTriticum aestivumt0
- Material
- Alamoot cultivare1
- Outcome
- grain yielde1
- Comparator
- measured and predicted grain yielde1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Evaluation and modification of model for the prediction of wheat yield at Iran region”
e1“the modified model was validated by data obtained for Alamoot cultivar and the results indicated that there was no significant differences at 5% level between measured and predicted grain yield”