Growers in the Southern Minnesota Beet Sugar Cooperative area are concerned about potassium nutrition. There have been an increasing number of potassium soil test values from production fields that are decreasing into the 100 to 120 mg per kg range. The loss of root yield from the lower soil test values and the loss of root quality if potassium is applied is also a concern. The objective of this study is to determine the effect of nitrogen and potassium application on sugar beet root yield and quality. A study at six sites from 2010 to 2012 in the Southern Minnesota Beet Sugar Cooperative growing was established to meet the objectives. The treatments included a factorial arrangement of four N rates (0, 44, 88, and 134 kg per ha) and six potassium rates (0, 33, 66, 99, 336, and 560 kg K 2 O per ha. The study was replicated five times. Root yield and quality were measured. Results indicate that potassium application increased root yield and quality at 50% of the sites. Nitrogen application increased root yield at 50 % of the sites and decreased quality at 75 % of the sites.
County Road 21, Renville, MN 56284. Influence of starter fertilizer on optimum nitrogen rate.Nitrogen management for optimum sucrose production is the goal of the nutrient management research in the Southern Minnesota Beet Sugar Cooperative growing area. Recent research results have caused growers to adopt the use of seed placed fertilizer on their sugar beet crop as a phosphorus source. The question growers have, will this use of starter affect the nitrogen rate needed for optimum sucrose? This research project was design to determine if the use of seed placed liquid fertilizer (10-34-0) affects sugar beet yield or quality and if the use of this practice affects revenue.Eight sites were established over a period of three years. The treatments included a factorial arrangement of the use of seed placed liquid fertilizer (28 L ha -1 , 10-34-0) and nitrogen rates of 0, 22, 45, 67, and 90 kg N ha -1 with 4 to 6 replication depending on the location. The N was applied broadcast as urea (45-0-0). Sugar beet root yield and quality were measured.The soil nitrate-N to a depth of 120 cm before the trials were established ranged from 32 to 109 kg ha -1 . The root yield, extractable sucrose ha -1 , and revenue ha -1 responded to the seed placed fertilizer and nitrogen applications differently at each location. In most cases, the response was to seed placed fertilizer was either none or a positive increase to root yield. The change in root yield expressed itself in the extractable sucrose ha -1 and the revenue ha -1 . The extractable sucrose Mg -1 of root was increased by the use of seed placed fertilizer and the use of nitrogen fertilizer did not affect the use of starter. This information indicates that the use of seed placed liquid fertilizer does not affect the nitrogen management of sugar beet for yield and quality.
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