Cultural tests with the Jerusalem artichoke
1929
Anderson, A. | Kiesselbach, T.A.
As an average for three years, 1925-1927, the Jerusalem artichoke yielded 6.17 tons of tubers and 5.02 tons of tops per acre, or a total yield of 11.19 tons per acre. Reduced to a moisture-free basis these yields were 1.51, 1.87, and 3.38 tons per acre, respectively. Comparable moisture-free forage yields of sunflowers and corn planted in rows for silage and orange sorghum grown in close drills for hay were 2.26, 2.96, and 3.56 tons per acre, respectively. The three-year average yield of 6.17 tons of fresh tubers per acre would produce 1.07 tons sugar which is 17.1% of the tuber weight. Results based on a two-year average suggest that there may be considerable range in planting date during the latter part of March and the first part of April without materially affecting the yield. As a two-year average the highest total yield per acre was secured from spacing the seed pieces 14 inches apart in the row. Seven-inch spacing produced a slightly higher acre yield of tubers, but they were noticeably smaller in size. As a two-year average, there was very little difference in total yield from planting small, medium, or large seed pieces. There was, however, an increase of about 10% in the yield of tubers and a decrease of 15% in the yield of tops as the number of seed pieces per pound was reduced from 50 to 10. Spacing seed pieces of this smallest size 7 inches apart in the row would require approximately 425 pounds of tubers per acre. The highest net yield of tubers (gross acre yield less tubers planted), however, was obtained from spacing the small tuber pieces 21 inches apart.
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