http://www.durgan.org/URL/?MTQAO 19 May 2010. Test to determine quantity by weight of four Yukon Gold potatoes.
A box 4 by 4 feet by 11 inches high was made in ideal soil and location to determine the quantity of potatoes by weight that can be produced. Each plant has about a foot on each side to insure minimum crowding of the root system. The seed potato was planted just below ground level and covered with soil about two inches on top.
Soil was placed in the corners for the first hilling. After the first hilling the growing plant will be covered adequately with bedding wood chips until the end of the season.
This test is to establish by weight the quantity, and size quality of potatoes that can be grown in a small space.
http://www.durgan.org/URL/?YJSOC 26 June 2010 Yukon Gold Potato Growth in 4 by 4 foot Test Box
The potatoes were hilled once and heavily mulched. A string was tied around the vegetation to keep upright. The premise being that the more vegetation exposed to the sun feeds the new tubers. This opposed to deep hilling and hiding the vegetation.