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Buckwheat Planting Date and Stand Density
A buckwheat planting date trial was conducted at the Carrington Research Extension Center in 1994 and 1995. The varieties 'Mancan' and 'Manor' were planted at four dates: May 25 or 26, June 6, June 21 or 23, and July 6 (1994 only). Across years and varieties, seed yield averaged 1410, 960, and 810 lb/acre with late May, early June, and late June plantings, respectively. Seed yield across varieties in 1994 averaged 1435, 970, 865, and 705 lb/acre with late May, early June, late June, and early July planting, respectively. The data indicates that seed yield may be satisfactory with late-planted buckwheat, but yield is substantially reduced (30 to 50 percent) compared to late-May planting and the crop is at risk if an early frost occurs.
An established stand of buckwheat should have a density of about 800,000 plants per acre or 16 to 20 plants/sq ft. Buckwheat has the ability to compensate if stand density is less than desired. Stands as low as 6 plants/sq ft have produced adequate yields. In a 1985 buckwheat study conducted at the Langdon Research Extension Center, an average of 9.2 plants/sq ft yielded 1280 lb/acre or only about 10 percent less than a stand of 14.4 plants/sq ft that yielded 1430 lb/acre.
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