Sweet potato plants gobble up a lot of nutrients from the soil to feed their burgeoning roots and extensive vines, which for some varieties may reach 15 to 20 feet in a long growing season. Fertilizing is a delicate matter, too much plant food -- especially nitrogen -- will produce skinny potatoes. With too much nitrogen, the vine portion of the plant dominates the growth, and root formation is delayed. But with too little fertilizer, the harvest won't meet your expectations. When using commercial fertilizer, the basic guideline is about four to five pounds of 5-10-10 for each 100-foot-row. If your soil is fairly fertile, you can cut this recommendation to two or three pounds for each 100-foot-row. The simplest way to apply the fertilizer is to broadcast it before making your ridges. Spread it uniformly over the row and include some of the soil area you will use for building your ridge.
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