I'd be interested in solid numbers, but my own guess is that they will differ in the opposite direction, with the average farmer dumping many more chemicals per acre than the average lawn owner does. Crop-dusting in some areas happens daily, and when not daily, 1-3x per week. By contrast, very few lawn owners will apply pesticide to their lawn every day. Few will do it even once a week. The norm where I've lived seems to be 1-2x per year, which is hilariously infrequent to a farmer. Even if they over-apply in their very occasional pesticide treatment, they're starting from a baseline of much less frequent application.