Abstract
The same young cropping 'Regina' sweet cherry trees were foliar treated with prohexadione-calcium (Pro- Ca) in two consecutive years at a concentration of [ 125, 125 x 2, 250 ]-(A) and [ 250, 375, 500 ]-(B) mg ProCa l<sup>-1</sup>, respectively. The following year some trees from A-treatments were left untreated to observe carry-over effects (C). None of A-treatments influenced tree trunk, shoot extension and internode growth, whereas B-treatments reduced shoot extension and internode length, simultaneously increasing flower bud density, particularly by 500 mg ProCa l<sup>-1</sup>. There were no carry-over effects produced by C-trees, except some retardation in shoot extension. None of the treatments influenced the tree cropping level. Fruit diameter was reduced by A-treatments, but fruit shape (L/D ratio) and mass were reduced by treatments B, and such reduction was also exhibited by C-trees (residual effects).
Highlights
Most of existing and newly planted sweet cherry orchards in Poland still use trees on vigorous rootstocks
Periodical measurements of branch terminal shoots in the active period of growth performed in 2000 did not exhibit any growth retardation except some caused by 250 mg ProCa l-1 that occurred only in the first month after spraying
Despite the lack of data on 2001branch terminal growth, significant differences were found in branch total growth per branch unit (BTEG) and Branch total extension growth (BTEG) calculated per cm2 of branch cross-sectional area (BCSA) between treated and control trees
Summary
Most of existing and newly planted sweet cherry orchards in Poland still use trees on vigorous rootstocks. The application of dwarfing rootstocks nowadays is somewhat limited. One of the possibilities to solve the tree growth problem in dense plantings is the application of either special training methods ( Sitarek , 2 0 0 4 ) or growth controlling substances 2 0 0 3 ) , or both techniques ( Jacyna and Buczek , 2 0 0 8 ). A plant bioregulator prohexadione-calcium (Regalis®, BASF, Germany) offers an effective growth control in pome
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