EFFECTS OF SUPPLEMENTAL MASS POLLINATION (SMP) IN A YOUNG AND A MATURE SEED ORCHARD OF PINUS-SYLVESTRIS

The effects of supplemental mass pollination (SMP) were studied in two Pinus sylvestris seed orchards differing in pollen production. Pollen was dusted over the whole tree during the period of peak female recep tivity using a pressurized backpack sprayer. The success of SMP was as sessed by means of allozyme markers. In the orchard with high pollen p roduction, detectable differences in SMP success rate were found betwe en clones, but the success rate was not influenced by the number of po llinations per day. The average estimated success rate of SMP was 19%. In the orchard with low pollen production, no significant differences in SMP success rate were found between years (22 versus 34%) or betwe en clones. The SMP success rate in the low pollen production orchard v aried between 14 and 69%.