This is wheat. Why is the dew at the tip of the leaf, not below?

Because the cold air touches the blade tip first and there is nest wind under the blade tip, the condition of cold air forming water droplets lags behind the blade tip. Because the tip of the blade is close to the balcony, the moon comes first, and after the water droplets form, the air humidity drops, and dew may not form under the leaves. Only when the air humidity is high enough, dew will also form under the lagging blades.