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Wheat: Precipitation The EPA has stressed that this model is not a perfect prediction of the future, especially since water patterns are difficult to predict. However, the model shows wheat's strong dependence on water. Since there is often not enough precipitation to provide crops with the water necessary for proper growth, many farmers must irrigate their land. Photo: Irrigation structures. Photo courtesy of Steven Croft. On the other hand, it is possible to have too much precipitation. If the wheat is too wet, it cannot be harvested because it will clog up the machines. If the wheat is dry but the fields are saturated with water, the wheat still cannot be harvested because the heavy machinery used to harvest it will get stuck in the muddy field. The longer mature wheat remains in the field, while the farmer waits for proper harvesting conditions, the more susceptible the crop is to damage. Two common sources of damage to wheat crops in extremely wet conditions are bacterial disease and fungal growth. Both of these can severely decrease wheat yield.
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