2 O 5 and K 2 O recommendations for adzukis. May. Earlier planted adzukis may take up to 20 days to emerge. Adzukis planted between May 11 and June 7 have yielded well at several Minnesota locations. Seeding rate should achieve 6 plants per foot of row in 30-inch row spacings. Because of seed size and germination rate differences, growers should calculate rates based on their seed lot.
Legumes require neutral to alkaline soil for maximum N fixation by nodule bacteria.
Soils with pH 5.8 to 6.4 have been used for adzuki production with few problems. Soils should be tested and, if necessary, limed to at least pH 6.0. Dolomitic limestone would need to be applied at least one year prior to adzuki production. Soils need to have medium to high soil test levels of P and K to ensure adequate fertility levels for maximum crop yield. In Wisconsin, these soil test levels are 31 to 60 lbs per acre and 221 to 300 lb K per acre depending on subsoil category.