Wirkung differenzierter K-Düngung auf bodenphysikalische Eigenschaften, Bodenwassergehalt und Ertrag von Zuckerrüben und Sommergerste auf einem Tschernosem im Mitteldeutschen Trockengebiet
2013
The water balance in the soil profile and soil moisture dynamic (available water content [%]) under sugar beet 2009 and spring barley 2010 were investigated in selected treatments of a long-term K-fertilization trial on a chernozem developed from loess in Bernburg, Germany (21% clay, 73% silt, 1.5% Cₒᵣg), which received an annual K-fertilization of 0/0 and 249/124.5 kg ha⁻¹, respectively, to sugar beet/spring barley within the last 14 years. Intensive K-fertilization increased the K content of topsoil and subsoil as well as available water capacity up to 60 cm soil depth. Under water stress conditions in August 2009, the treatment with high K-fertilization achieved the highest sugar beet yield, sugar content (°S) and white-sugar-yield at final harvest. Combined with the higher beet yield, the water use efficiency was also increased and the water pool of the subsoil was used more efficiently. In the following year (2010), weather conditions were relatively wet. Under these conditions, no differences in yield parameters and water consumption of sugar beet and spring barley between both K-levels were observed.
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