Fertilizing Sweet Potato Plants

Choose the Right Fertilizer: Select a balanced, all-purpose fertilizer with equal parts nitrogen (N), phosphorus (P), and potassium (K). A fertilizer labeled as 10-10-10 or similar works well for sweet potatoes.

NOTE: This is part 4 in a series of 8 articles. For a complete background on how to grow sweet potato plants, we recommend starting from the beginning.

Timing is Crucial: Apply fertilizer before planting and again when the vines start to spread. Avoid excessive nitrogen, especially during the early stages, as it can lead to lush foliage but hinder tuber development.

Incorporate Organic Matter: Prior to planting, enrich the soil with organic matter such as compost or well-rotted manure. This provides essential nutrients and improves soil structure.

Side-Dress During Growth: Side-dress the sweet potato plants with fertilizer when they begin to vine out. Create shallow trenches or furrows beside the rows and apply the fertilizer, keeping it a few inches away from the plants.

Watering After Fertilization: Water the plants thoroughly after applying fertilizer. This helps to dissolve the nutrients and deliver them to the root zone.

Monitor Plant Health: Keep an eye on the plants for any signs of nutrient deficiencies or excesses. Adjust fertilizer applications if needed based on visual cues from the plants.

Use Controlled-Release Fertilizers: Consider using controlled-release fertilizers for a steady nutrient supply over an extended period. This can simplify the fertilization process and reduce the risk of overfeeding.

Cease Fertilizing Before Harvest: Stop fertilizing the sweet potato plants about 3-4 weeks before the anticipated harvest date. This helps the tubers mature properly and enhances their flavor.

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