FEATURES OF LAYERS ROOTING OF THE UNIVERSAL CLONAL ROOTSTOCK UUPROZ-6 IN THE MOTHER PLANTATION

The experiments on growing the new universal clonal rootstock of the apple subfamily (Maloideae) UUPROZ-6 in the mother plantation for layers were carried out in the conditions of the Ukraineʼs Western Polyesye. The method of the plantation establishment was studied as well as organic substrates for earthing up. The novelty was the use of a substrate which stayed after growing Pleurotus ostreatus Fr. Kumm. The period from the first shoots earthing up to the beginning of the root formation on them appeared to be 36 days. Earthing up of the layers with half-decayed pine sawdust and the above mentioned substrate made it possible to reduce this period by 2-4 days. The average root-neck thickness of the UUPROZ-6 vertical layers for the 3 researches years was 9.2-9.7 mm, of the horizontal ones 8.2-9.0 mm. The height of the vertical layers was 121-136 cm, of the horizontal ones 106-116 cm. When using the sawdust and fungous substrate the thickness and height of the vertical layers increased and of the horizontal ones decreased. The positive quality of UUPROZ-6 is complete absence of lateral branching on the layers. Its another positive characteristic is high field resistance to Phyllosticta pirina Sacc. The application of the sawdust and fungous substrate as well as the horizontal placement of shoot-formative wood improves the layers rooting. The summary roots length on one layer when using sawdust and fungous substrate was 145-157 and 126-142 cm respectively (while earthing up 67-75 cm)