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Six fertilization programs were applied to three woody plants:  Physocarpus opulifolius  `Nanus',  Spiraea  ×  bumalda  `Gold flame', and  Weigela florida  `Rumba'. The objective of this study was to determine fertilization programs best adapted to container woodyplant production. Treatments were: 1) Nutricote (5 g/liter of growth medium) + weekly fertigation of 20N–20P–20K (300 mg N/liter); 2) Coïc-LeSaint solution for each irrigation; 3) Nutricote + weekly fertigation of liquid 9N-9P–9K (300 mg N/liter); 4) fertigation with complete nutrient solution (125 mg N/liter); 5) Polyon + weekly fertigation of 20N–20P–20K (300 mg N/liter); and 6) Nutralene + weekly fertigation of 20N–20P–20K (300 mg N/liter). The experiment took place between 25 June 1991 and 15 Aug. 1992. Results show that, independent of species, plants given fertilization program 4 had lower plant height (57 cm) and stem dry weight (97 g) than plants under other treatments, the average for each parameter being 72 cm and 127 g, respectively. Plant height was highest in  Physocarpus  with treatment programs 2, 4, 5, and 6.  Weigela  had greater growth under program 2, while  Spiraea  had more growth with programs 1, 3, and 6. Consequently, differences exist between optimum fertilization programs used for each species studied.

EFFECT OF NUTRIENT SOURCE ON THE GROWTH OF PHYSOCARPUS OPULIFOLIUS `NANUS', WEIGELA FLORIDA `RUMBA', AND SPIRAEA × BUMALDA `GOLDFLAME'