Velicica Davidescu, Roxana Madjar, Gabriela Neata


For the potted species, the case of ornamental the soil has been gradual substituted, into the cultural technologies, with substrates, in principal organic materials. Culture substrates can assure an equilibrate level of water and nutrients to the root system. Substrate reaction is one of the most important agrochemical indices which affect the plants by their different requirements from this point of view.(1)The researches during 2003, 2004 and 2004 have been followed by investigate some acidifying substances, the applied effect in the substrate, the quantities and the methods of applied for decreasing the substrate pH. The concerning of the research was to correcting the substrate pH with the acidifying substances applied with best results during the vegetation period at the ornamental plants cultivated in containers. The tested ornamental species was Chamaecyparis, three years old, cultivated in containers with 5L capacity, in 5 variants of substrate. The acidifying substance, sulphur, was applied in 3-g/L doses, or 15 g/pot. The sulphur applied technique was on the substrate surface (not to disturb the plant roots) and the sulphur incorporation was obtained with irrigation water. At the beginning of the experience specific analysis was made on all 5 variants of substrate. The pH monitoring and the analysis for other agrochemical index were made 1, 3, 7, 10 and 14 days after the acidifying substance was applied. (2) During the vegetation period of two month, the growing dynamics of the plants height from containers was monitored. During the vegetation period, the plants dynamics growing was different, depending on the variant substrate. It is known that coniferous plants have difficulty in growing, takes time and cost in obtained planting material from nurseries plant. The total growing per variant indicates variant V3 with the higher growing (21.34 cm), even at the vegetation start the plant has the lower height (47.66 cm). In all variants, the vegetative growing was monitored in time stating from March. In conclusion, the substrate composed by forestry compost and sand (V3) has a favorable reaction in pH correction and the plants cultivated on that substrate have in dynamics the best results in high growing (21.34 cm). The substrates from variants V2 (peat + sand) and V5 (forestry compost + leaves compost +sand) reacted significantly to the pH modification, the high plant growing being of 13 cm and 14.17 cm, respectively.


culture substrate; ornamental plants; pH substrate; acidifying substances

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