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Published in Scientific Papers. Series B. Horticulture., Vol. LVII
Written by Georgeta CAREŢU, Liana Melania DUMITRU, Corina GAVĂŢ

The containerized culture of the ornamental plants has an increasing importance for producers. These are interested in finding the proper solutions for the insurance of the best growth conditions for the plants. Fertilizers are indispensable for success of the type of culture at high parameters.Researches have been done at the Fruit Research Development Constanta between 2004-2006.The biological material used for studies was represented by plants of Thuja Occidentalis Columna. Substratum for culture, resulted by mixing some compounds, were represented by: Substratum 1 made by: ground celery, ground leaf, peat and sand 1:1:1:0,5; Substratum 2 made by: forest compost and perlit 3:1. Experimental scheme included 6 variants: 2 controls unfertilized, with plants cultivated in the two substratum; 2 variants with substratum fertilized with forest compost NPK 15:15:15; 2 variants fertilized during vegetation with Coïc nutritive solution. There were organized (6) six variants with four (4) replications. During the three years of studies has been done agrochemical analysis of substratum from containers, in May and in September, to establish: pH; total nitrogen; humus %,; organic substance; phosphorus; potassium. The observations made on the plants consisted in: biometric measurements of the plants in May and September regarding: height of plants (cm), trunk thickness diameter (mm), number of offshoots; agrochemical analysis for finding the provisioning level in nutritive elements of the plants. The best substratum for Thuja Occidentalis “Columna” was represented by substratum 1 with complex fertilizer (NPK) 15:15:15 applied 5 kg/mc before planting in containers. Substratum 1, fertilized before planting in containers leaded to significant growth. Coïc solution applied during vegetation had also considerable influence on plants growth.

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