How to Fertilize Potato
When Should I Start Feeding My Potato?
Potatoes are planted after the last frost, so your feeding schedule depends on when the ground is workable and soil temperatures reach at least 45 degrees F in your region.
How Often Should I Fertilize My Potato?
Apply your first dose at planting by mixing granular fertilizer into the soil or trench. This gives the seed potatoes a nutrient-rich start as they sprout.
Side-dress every 3 to 4 weeks once the plants are about 6 inches tall. Pull soil up around the stems (hilling) at the same time, which buries the fertilizer and encourages more tuber sites along the buried stem.
Stop feeding once the plants begin to flower or when the foliage starts to yellow and die back. Late-season nitrogen delays tuber maturation and can reduce storage quality.
What Is the Best Fertilizer for Potato?
Potatoes do best with a balanced or slightly phosphorus-forward granular fertilizer at planting, such as 10-10-10 or 5-10-10. Phosphorus supports strong root and tuber development early on, which sets the stage for a good harvest.
Once the plants are up and growing, switch to a nitrogen-rich side-dressing to fuel the leafy top growth that powers tuber formation. A 10-5-5 or similar high-nitrogen option works well for these mid-season feedings.
Avoid high-nitrogen fertilizer at planting, as it can push excessive vine growth at the expense of tubers. The goal is to front-load phosphorus and potassium, then add nitrogen steadily through the growing season.
How Do I Fertilize My Potato?
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