Effetti della tecnica di concimazione sull'allevamento di Pelargonium zonale L. in vaso

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[automatically translated] The choice of an appropriate fertilization technique, in the nursery industry, is particularly important as it has a significant influence on the success of the product intended for marketing, and a considerable incidence on production costs. Fertigation is the most widespread practice of fertilization in the nursery, however, more and more significant, is the recourse to the use of formulated to slow effect that allow considerable savings sull'impiantistica and workmanship. With this research we proposed was to evaluate the vegetative and productive response to different methods of fertilization, a very popular plant as a pot plant species: geranium. Have been compared three different methods of fertilization: fertilization controlled release fertilizer (Osmocote - 18: 9: 10; 2 MgO) (thesis A), fertigation continues (thesis B) and fertilization with controlled release fertilizer integrated with fertigation. The nutrient solution on the thesis B was prepared to make the same dose of fertilizer administered with the controlled release formulation. For the thesis C fertilization has been integrated with the administration of a nutrient solution containing the mineral elements periodically detected in the leachate of the thesis A in order to maintain constant the level of available nutrients (thesis C). Plants fertilized with only Osmocote have pointed out more stunted growth rates than the other, reaching lower heights and differentiating a lower number of plant-1 inflorescences. The differences between the theses were also evident on the number of leaves plant-1, especially in the last period. At the end of the cycle, the plants of the dissertation A showed signs of distress, such as fallen leaves and yellowing. Even the production of inflorescences and inflorescence-1 flowers have experienced a sharp decrease, particularly evident in June. It is likely that the dell'Osmocote effect has not been sufficient or has run out in earlier than stated on the label and that the plants have suffered damage from nutrient deficiency. The plants of the theses B and C were very lush and appreciable from an aesthetic point of view. In particular, the plants fertilized with Osmocote and fertigated have highlighted a strong floribundità and peduncle shorter flowering which gave them a harmonious picture and a great aesthetic value. From the search results it appears clear the importance of being able to superimpose the transfer curve of the nutrients of the formulations to that of absorption by the plant. It is not unusual, as was also found by the present research, that in times of peak demand on the part of the crop, there is not a proper release of macro and microelements in the substrate. Conversely it is possible that in the culture medium there is an availability of excessive nutrients compared to the demand of the plant and that, accordingly, it is to have the losses by percolation or it is determined a saline stress to the excessive electric conductivity of the nutritive solution. As found in other studies, the formulation at a slow effect did detect a different efficiency of energy usage from that stated on the label (8-9 months).
Original languageItalian
Number of pages1
Publication statusPublished - 2010

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