November 2013, Vol. 7, No. 11, pp. 1179-1184 Journal of Life Sciences, ISSN 1934-7391, USA Influence of Biopreparations on Maiden Growth of Sour Cherry (Prunus cerasus L.) in Organic Nursery – Preliminary Results Zygmunt Stanisław Grzyb, Wojciech Piotrowski, Lidia Sas Paszt and Paweł Bielicki Department of Pomology, Research Institute of Horticulture, Pomologiczna 18, Skierniewice 96-100, Poland Received: August 06, 2013 / Accepted: September 06, 2013 / Published: November 30, 2013. Abstract: A study was conducted in an organic nursery in 2010 and 2011 on the maiden growth of sour cherry cultivars “Debreceni Bötermö” and “Sabina” grafted on Mahaleb cherry seedlings (Prunus mahaleb L.). The young trees were grown at a spacing of 25 cm × 1.0 m on a podzolic soil. The study focused on the differences in diameter and height of the maiden stock, the branch number, lateral shoots in the crown and their length, among treatments with various bioproducts applied to the maidens once or twice, such as granulated manure, Micosat, Humus UP (humus cultivated), Humus Active + Aktywit PM (positive microorganisms), BioFeed Amin, BioFeed Quality, Tytanit and Vinassa. The control maidens were not fertilized at all, or fertilized with NPK (nitrogen, potassium, phosphorus). The first time when these products were applied in the nursery was mid-May, and the second time was one month later. Repeating the application of humic preparations (vermiculites) and a formulation containing mycorrhizal fungi (Micosat) gave better results than applying them only once, but in the case of BF Quality and the preparation Tytanit treating the plants for the second time did not increase their growth vigour compared to the plants treated only once. And the effectiveness of the biopreparations was different for the treated cultivars changed. Key words: Maiden, cherry, bioproduct, nursery, application. 1. Introduction The cultivation of young sour cherry trees by ecological methods is not typical [1]. The unique aspect of them is that this species is high susceptible to the leaf spot disease, and lose their leaves already at the beginning of the second half of summer and stop growing [2-5]. Therefore, everything must be done to ensure them manage to acquire the largest size possible during their very short period of vegetation. To achieve this objective, attempts are made to stimulate their growth from the beginning of spring by fertilizing the soil or leaves with different products [6-11]. In organic farming, it is permissible to use only organic products and some others, such as Corresponding author: Zygmunt Stanisław Grzyb, Ph.D., Prof., research fields: ecology, nursery, gene resources, stone fruits. E-mail: zygmunt.grzyb@inhort.pl. Tytanit, to stimulate biological processes occurring in plants [12-16]. However, there is not enough relevant information in horticultural literature as to in what doses and how many times during the growing season they should be used to obtain the desired results. For apple, such findings have been presented by Grzyb et al. [17-19]; but for sour cherry the same thing does not yet exist. The aim of this study is to assess the frequency effect of using preparations in an organic nursery on the quality of maiden sour cherry trees as determined mainly by the size of the whole tree and the overall architecture of its crown. 2. Materials and Methods The study was conducted in 2010-2011 in an experimental nursery located in Mokra Lewa near Skierniewice, Poland, on a podzolic soil. Analysis of D DAVID PUBLISHING