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European Food Research and Technology

, Volume 234, Issue 1, pp 33–44 | Cite as

Effects of nutrition strategy on the levels of nutrients and bioactive compounds in blackberries

  • Liaqat Ali
  • Beatrix W. Alsanius
  • Anna Karin Rosberg
  • Birgitta Svensson
  • Tim Nielsen
  • Marie E. Olsson
Original Paper

Abstract

The effects of nutrition strategy on levels of nutrients and bioactive compounds in fruit and leaves of blackberries were studied in greenhouse-grown blackberry plants fertilised with combinations of two levels (low, high) of nitrogen (60 and 100 kg ha−1, respectively) and potassium (66.4 and 104 kg ha−1, respectively). Plant concentrations of organic phytochemicals were quantitatively analysed by high-performance liquid chromatography. High amounts of both fertilisers produced high amounts of all nutrients and bioactive compounds analysed in fruit except total acidity and ellagic acid. There were major differences in compounds affecting taste in fruit, e.g., sugars (fructose and glucose), total soluble solids and pH, and also in anthocyanin content. The concentrations of secondary metabolites, vitamin C and ellagic acid in fruit also varied significantly between treatments, although the differences were smaller. Storage of blackberries showed variable effects in the different levels of compounds, and the changes found were small. Nutrient regime did not affect blackberry leaves to the same extent, and only minor changes were found. The findings show that by optimising plant nutrition, phytonutrient levels can be maximised and maintained in fresh and stored berry crops, especially those grown in greenhouses, where conditions can easily be regulated.

Keywords

Nitrogen Potassium Fertilisation Nutrients HPLC Storage 

Notes

Acknowledgments

The authors are grateful to the Swedish Farmers’ Foundation for Agricultural Research (Stockholm) for financial support in this project. Our thanks to research engineer Karl-Erik Gustavsson for skilful technical assistance during HPLC analysis and to Assistant Professor Jan-Eric Englund for statistical advice. The Higher Education Commission (HEC) of Pakistan is gratefully acknowledged for a PhD scholarship.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Liaqat Ali
    • 1
  • Beatrix W. Alsanius
    • 1
  • Anna Karin Rosberg
    • 1
  • Birgitta Svensson
    • 1
  • Tim Nielsen
    • 2
  • Marie E. Olsson
    • 1
  1. 1.Department of HorticultureSwedish University of Agricultural SciencesAlnarpSweden
  2. 2.SIK, IdeonLundSweden

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