In the diploma thesis, we determined whether the indigenous soil from the abandoned land can be enriched with the addition of chicken manure to the extent that it could replace the professional horticultural substrate. We had two basic substrates in the experiment: sifted indigenous soil (A) and artificially prepared mineral soil from soil excavations and crushed natural rocks (B). We added settled and weathered chicken manure to the basic substrates in 0, 5, 10, 25, and 50 percent by volume and prepared soil mixtures - horticultural substrates. We checked the quality with chemical analyses and a test plant. For control (K) we used a professional substrate from Humko d.o.o. We filled one-liter pots with the mixtures prepared in this way and planted pelargonium cuttings in them. Each treatment was performed in three replicates. During the period of 11 weeks (April - June), we monitored the growth of the plants and measured the length of the shoots, the number of leaves, and flower appendages several times. From time to time, we watered the plants more vigorously to take samples of the leachate, and the pH value, electrical conductivity, and nitrate concentration were controlled in the laboratory. Before and after the experiment, we performed laboratory measurements of soil samples and found that we enriched native soil with doses of chicken manure that had similar properties to the professional substrate, some even better. The best results were in pots with 25 and 50 percent of manure. In all measurements, substrates made from indigenous soil were better than substrates made from artificial mineral soil; even better than the professional substrate due to the good starting supply of nutrients. A higher percentage of manure meant better fertility, which was very intensively demonstrated in the case of mixtures of chicken manure and artificial mineral substrate, which had a very poor initial supply of nutrients and humus.
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