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Changes in content of phenolic compounds in orchard soil after replantation of apple trees in relation to fertilization and irrigation

Barbara Politycka*, Dorota Adamska*, Eugeniusz Pacholak**

**Department of Plant Physiology
**Agricultural University
**Wołyńska 35, 60-637 Poznań, Poland
**Department of Pomology
**Agricultural University
**D±browskiego 157, 60-594 Poznań, Poland

The present studies were undertaken to elucidate the effect of irrigation and fertilization on the content of phenolic compounds in orchard soil, which have been considered as one of the causes of replant disease in a young apple orchard. Three irrigation levels and six fertilizer treatments were used in the experiment. In the third and fourth year after replantation, the total phenolic content in the orchard soil was determined and the degree of its phytotoxicity estimated. Initially high phenolic content in the soil decreased with the passage of time. The degree of soil phytotoxicity was closely correlated with its phenolic content. The rapidity of the observed changes in phenolic content depended on the soil moisture, since a negative correlation was found between the intensity of irrigation and phenolic content. However, fertilization had no effect on the recorded changes in the level of these compounds.

Politycka B., Adamska D., Pacholak E., 2001. Changes in content of phenolic compounds in orchard soil after replantation of apple trees in relation to fertilization and irrigation. Folia Horticulturae 13/1: 55-63.