Answer: If your potato plants are growing well--good, lush green foliage, no major insect or disease problems, then you are doing everything right when planting. Also, that tells me that your soil is just fine. Are you waiting long enough to harvest your potatoes? Begin harvesting when the plants begin flowering, for small "new" potatoes. Harvest full-size potatoes once the foliage begins to die back. Sometimes too much fertilizer, especially nitrogen, will encourage the growth of the foliage at the expense of the tubers. I would cut back on your fertilizing once the plants are about a foot tall, and see if that helps stimulate them to produce tubers. Also, have you been hilling them? Once the plants are about 6 inches tall, gently mound the soil up over the plants, so the top few inches are showing. As the plant grows, continue every two weeks or so until the flowers appear. This mound of soil will give the plant extra room in which to develop tubers. Also, don't overwater--try to keep soil evenly moist, watering only as necessary when there hasn't been enough rain. I hope you get a better harvest this year!
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