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Growers in the San Joaquin Valley were surveyed to determine what fraction of their crop residue is field-burned and during what seasons field burning commonly occurs for each crop. Survey results show that only four crops - rice, almonds, walnuts, and wheat — account for 88% of the crop residue burned in the San Joaquin Valley, and 95% of the crop residue burned in the state (exclusive of forestry). Rice and almonds respectively account for 64% and 18% of the residue burned statewide.