The main aim of this study was to be established productivity of tomato plants, grown in conditions of late field production, depending of the composition of seedling mixture. The experiments were carried out during the period 2012-2013 on experimental field, Department of Horticulture at the Agricultural University -Plovdiv with cultivar Opal F1. The variants with additives of different components of organic and organo-mineral origin to the standard peat-pearlitic mixture and peat-pearlitic mixture with absorbent were tested. The yield of standard fruits was highest in the variant peat-pearlitic mixture with absorbent and addition of organic fertilizer Boneprot 2%.© 2015 PSCI Publisher All rights reserved. Key words: tomato, seedling, containers, seedling mixture, yield.Abbreviations: PPM -peat-pearlitic mixture; PPMA -peat-pearlitic mixture with adsorbent Fiba sorb; PPM+L -peatpearlitic mixture with Lumbrikal; PPMA+L -peat-pearlitic mixture with adsorbent Fiba sorb with Lumbrikal; PPM+SS -peat-pearlitic mixture with sea sapropels; PPMA+SS -peat-pearlitic mixture with adsorbent Fiba sorb with sea sapropels; PPM+B -peat-pearlitic mixture with adsorbent Fiba sorb with Boneprot; PPMA+B -peat-pearlitic mixture with adsorbent Fiba sorb with Boneprot.
IntroductionThe late field production of tomatoes provides a real opportunity for extending the marketing of fresh fruits, which have significantly higher biological value and better taste than processed at the same time in greenhouses (Murtazov, 1984). A significant part of the harvested product direction in this production is produced by postharvest ripening of the preserved standard green fruits harvested before the fall of the first autumn frosts (Ignatov, 1976;Cholakov, 1987). With good organization and proper conditions the postharvest ripening may continue to December (Dimitrov, 1968). This was associated with significantly longer period of consumption of fresh tomatoes from field production and increasing its efficiency.The use of high quality seedlings is essential for realizing the biological potential of plants in the field production of tomatoes and receiving good economic results (Markovic et al., 1997). Cultivation of high quality seedlings requires compliance with several main technological elements, one of which is the composition of the culture mixture (Murtazov, 1980). In Bulgaria research related to the composition of the seedling mixture in container growing of tomato seedlings are made (Panayotov et al., 2004;Dintcheva and Tringovska, 2011), but information for late field production of tomatoes absence. The favorable influence of different organic products on plant productivity (cucumber, cabbage, pepper) during growing season is established (Dimov et al., 2007; Vlahova and Popov, 2014), but there is no scientific information on the productivity of late tomato plants, during the growing season, depending on the composition of seedlings mixture, used for growing seedlings in containers. Unclear are a number of important issues relating to optimizing ...