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Master Thesis

Compréhension du comportement d'engrais organiques dans les terreaux destinés au marché amateur

Abstract : With growing concerns about environmental problems, the organic growing media market has been developing for the past few years. Organic growing media is fertilized with organic fertilizers, which encompass a wide variety of natural components. The behavior of these fertilizers can vary a great deal, especially regarding nitrogen mineralization. In order for a company to ensure the quality of these growing media for individual use, their chemical evolution during storage must be assessed along with the consequences of this evolution on growth and germination of plants. We first investigate the impact of pH on the evolution of peat-based mixes during storage and on plants grown in these growing media after storage. pH doesn't seem to be of major importance regarding plant germination as long as it stays within the 5.5 - 6.5 range. Thus a growing media with a pH of 5.5 to 6.5 should ensure a good nitrogen mineralization while allowing good plant germination. In a second part, we follow the evolution of nitrogen mineralization in a group of growing media bags stored as a plastic-wrapped palette and we try to measure the impact of this special kind of storage on plant germination and growth. Some mixes can undergo rapid and important NH4+ accumulation along with N03- rarefaction. These phenomena can cause a decline in plant growth and germination but further study is required to try and isolate precise levers of action that could provide a way of avoiding such negative outcomes.
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Master Thesis
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Submitted on : Tuesday, November 19, 2013 - 9:33:09 AM
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  • HAL Id : dumas-00905965, version 1

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Boris Calvet. Compréhension du comportement d'engrais organiques dans les terreaux destinés au marché amateur. Sciences agricoles. 2013. ⟨dumas-00905965⟩

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