What is a good food to mix in the soil for growing potatoes ?
Multnomah County Oregon
Thank you for asking about growing potatoes. Generally, if you don't have sandy-loam soil, (and here in the Portland Metro area few of us do), amending with organic matter is helpful for the soil structure and improves the fertility some. By “food” for the soil, do you mean fertilizer? We don’t have a standard suggestion for type and amount of fertilizer for potatoes grown in Western Oregon. A soil test is the best way to determine what your garden area needs. I recommend you contact this lab for information about the tests available, costs, and how to collect the sample. Tell them what you want to grow, so that your results are the most helpful. A & L Western Agricultural Laboratories, 10220 SW Nimbus Ave., Bldg. K-9, Portland, OR 97223, Phone (503) 968-9225
“OSU recommends colorful potatoes for home gardens” is a short article you may find help helpful, though it doesn’t speak to fertilizer recommendations. http://extension.oregonstate.edu/gardening/osu-recommends-colorful-potatoes-home-gardens