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Crop rotation effects on yield, technological quality and yield stabilityof sugar beet after 45 trial years

  • Autor/in: Götze. P.; J. Rücknagel, M. Wensch-Dorendorf, B. Märländer, O. Christen
  • Jahr: 2017
  • Zeitschrift: European Journal of Agrnomy 82
  • Seite/n: 50-59
  • Stichworte: Ecovalence, linear regression analysis, coefficient of variation, cropping interval

Abstract

tLong-term field trials constitute an essential basis for research into the effects of agricultural managementpractices on yield and soil properties. The long-term field trial Etzdorf (Germany) was set up in 1970 anduses various crop rotations with sugar beets (Beta vulgaris L., SB) to investigate the influence of increasingcropping concentrations (20 %–100 %) and decreasing cropping intervals (0–4 years) on the yield andquality parameters of SB. However, evaluation of the yield stability of SB in diverse crop rotations has notbeen conducted in this context so far. For this reason, the yield for the last 13 years of the trial (2002 until2014) was subjected to such an evaluation. Besides cropping interval and cropping concentration, thecrop rotations investigated also differed in terms of the complementary crops cultivated (winter wheat,Triticum aestivum L.; alfalfa, Medicago ssp.; potato, Solanum tuberosum L. and grain maize, Zea mays L.).Both SB root yield and white sugar yield increased with an increasing cropping interval or decreasingcropping concentration of SB in the crop rotation. In addition, a positive effect on root yield and whitesugar yield was seen when integrating alfalfa, while cultivating SB after SB displayed the lowest root yieldand white sugar yield. Sugar content was lowest in SB monoculture. In order to assess stability of whitesugar yield, the coefficient of variation and ecovalence were calculated, and a linear regression analysisof the individual crop rotations’ annual yield was performed for the annual average of all crop rotations.When considering these three parameters, the crop rotations with a cropping interval of at least 2 yearsdisplayed higher yield stability, with simultaneously higher white sugar yield, than the crop rotationswith a cropping interval of 0 and 1 year. By integrating alfalfa into the crop rotation, it was also possibleto achieve above-average white sugar yield with high yield stability for a cropping interval of 1 year.
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