Istraživani su rast i rodnost stabala šljive uzgajane na teškom tlu u razdoblju od tri godine nakon sadnje (2005-2007). Eksperimentom su bile obuhvaćene sorte šljive Topfirst, Topfive, Topstar plus, Topgigant plus, Top 2000, Tophit plus, JoJo i Haganta cijepljene na podlozi WaxWa, sađene na razmaku 4,0 x 2,5 m (1000 stabala/ha).
Vegetativni rast, izražen površinom poprečnog presjeka debla u velikoj mjeri je ovisio o sorti i bio je manji u sorata Topgigant, Top 2000 i Haganta, veći u sorti Topfirst i Topfive, te još veći u sorte Topstar, a najveći u sorte Tophit. Prema vremenu dozrijevanja i kakvoći plodova posebnu su vrijednost očitovale sorte Topfirst, Topfive i Jojo. Podloga WaxWa se pokazala prikladnom za intenzivan uzgoj šljive u gustom sklopu.An investigation into the growth and cropping of plum trees, which were cultivated on heavy soil, was conducted for three years after planting (2005-2007). The experiment included plum cultivars Topfirst, Topfive, Topstar plus, Topgigant plus, Top 2000,
Tophit plus, JoJo and Haganta, grafted on rootstock WaxWa, and planted at the distance 4.0 x 2.5 m (1000 trees/ha). Tree vigour expressed as trunk cross-sectional area of Topgigant, Top 2000 and Haganta was lower than of Topfirst and Topfive, whereas tree
vigour of Topstar was higher and of Tophit was the highest. In our growing conditions, among cultivars in the trial, Topfirst, Topfive and Jojo showed good properties in view of ripening time, yield and fruit quality. Rootstock WaxWA looks as promising for modern, intensive plum growing at high density
