Why do we have a flat optimization curve with rice in Cotonou?

[akouete-kpakpo]

Maybe we are just playing with a crop which does not work at all in a given location.

Examples in which the optimization curve should not be flat:

• [ ] sugarcane with variety Sugarcane_VanHeemst_1988 in Ouagadougou
• [ ] cowpea with variety Cowpea_VanHeemst_1988 in Dun-Le-Palestel
• [ ] millet with variety Millet_VanHeemst_1988 in Kolkata.
• [ ] sugarbeet with variety Sugarbeet_601 in Dun-Le-Palestel