The wheat crop is starting to "head," which is what we call it when the panicle emerges from the sheath. The panicle is the cluster of flowers where the grains will eventually form. In the top photo, the heads are just emerging. Rice looks very similar to this when it heads, and the Thai people call this stage "smiling rice." So we'll call it smiling wheat. In just a few days, the entire field will look like the bottom photo, with fully emerged heads ready to be pollinated by the wind.
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