The aim of the study was to determine the influence of microirrigation (microjet sprinkling and drip irrigation) and organic fertilization (compost prepared on the base of sewage sludge) on a seedling vigour and a degree of mycorrhiza of one-year old Scot pine seedlings (Pinus sylvestris L.) produced on a post-agricultural ground with the use of zoo-melioration. Two-year (2003-2004) field experiments were carried out on an experimental field of Department of Land Reclamation and Agrometeorology in Kruszyn Krajeński near Bydgoszcz. Investigations were conducted on a loose sandy soil belonging to VI quality class (degraded meadow black earth formed from coarse sandy soil on a shallow loose sandy soil). The first row factor was irrigation used in three treatments: without irrigation (control), drip irrigation, microjet sprinkling. The second row factor was fertilization, used in two variants: mineral fertilization (standard applied in forest nurseries), organic fertilization (compost).
Irrigation significantly increased the height and the diameter of Scot pine seedligs. There were no significant differences in the characters of the growth between the two irrigation systems. Fertilization of Scot pine seedlings with the compost increased significantly the height of seedlings. Interaction of irrigation with organic fertilization in shaping of Scot pine seedling height and diameter was occured. Pine seedlings grown on fertilized with compost plots under irrigation conditions were characterized by larger height and diameter. Factors of experiments differentiated the micorrhiza number of pine seedlings. The highest mean micorrhiza number was detected in variant of organic fertilization under drip irrigation conditions. Joint effect of organic fertilization and microjet sprinkling positively influenced the number and the species number of Oribatida. Gatherings of Oribatida on control positions were characterized by dominance of Oribatula tibialis. Irrigation positions were characterized by the great number of Tectocepheus velatus. Obtained results indicated that the amelioration measures used in the experiment can positively inluence on the production of Scot pine seedligs on post-agricultural ground.
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