Yield of potatoes.
Method weigh a number of potato plants at harvest and average.
I did some tests over several years. The average is less than 3 pounds per plant. I have got a high a six pounds by carefully watering and having ideal weather.
The method of seed potato weight to harvest is without merit. For example a seed potato could be cut into several pieces to enhance the figures.
A field crop is somewhere between 2 and 3 pounds per plant. I have in some cases with good weather and careful watering got as high a six pounds per plant. Rare but possible.
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