Daer all,
I have simulated crop yields in Arcswat. For the resaerch area, I only have the potential crop yield which I think can be acheived only in no water stress and nutrient condition.
However, crop yields are too low. I suppose I should consider following steps to increase crop yield to the potential one:
1-auto irrigation
2-auto fertilization
3-adjusting crop parameters
I have data regarding actual fertilization , but no data about irrigation and no data about actual yield.
my questions are as follows:
1-what are some realistice value for parameters in auto irrigation and auto fertilization?
2-how can I calibrate (adjust) crop parameters such as HI, BLAI, and BIO-E just with potential crop yields in the whole area?
3-the research area is in north of germany. does any body have experience/data/information to share with me in this area?
Thanks for any support and I look forward to hearing your valuable help!
Best
Shima
Dear Shima,
Though I am not experienced with ArcSWAT, in case it works like APSIM, I wouldn't recommend you to modify the LAI of the crop (Since it is usually well calibrated across a range of environments), but in the crop module, search for the cultivar you are using. If it is a cereal, just increase the number of grains per cob for instance. You will then see yield potential increasing and will have to adjust it to your reasonable values.
Good luck,
Alaiin
Most important would be to have a cross-validation of predicted values with those of ground truth data in order to establish the reliability of your simulation ..
The person who is working on ArcSWAT can answer nicely.....I think.......
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