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Nearly all the field crops grown on the farms are planted by machines called planters or drills. These machines cut furrows in the soil, drop seeds into each furrow, and cover the seeds with soil – all in one operation. Some fertilizers and pesticides are applied to the soil during planting. Equipment to distribute the chemicals may be attached to the seed drill. Herbicides applied before or during planting kill many kinds of weeds, but not all. Some weeds may develop with the crops. Farmers control such weeds with cultivators. These devices stir the soil between rows and so uproot and bury any weeds.
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Some fertilizers and pesticides are …
grown on the farms
planted by planters or drills
attached to the seed drill
applied to the soil during planting