Keywords
fertiliser
granulation
organic waste
How to Cite
Abstract
This study aimed to investigate the physicochemical properties of fertiliser granules and compare their fertiliser value. The study used analytical methods, including potentiometric pH determination, the Kjeldahl method for nitrogen determination, spectrophotometry for phosphorus determination, and flame photometry for potassium and sodium determination. The content of heavy metals (Cr, Ni, As, Cd, Pb) was determined by inductively coupled plasma mass spectrometry (ICP-MS). The test material consisted of pellets made from compost (consisting of green waste: grass cuttings, leaves, and pruned branches) and slurry made from dried nettle. The results showed that the granules had pH values ranging from 7.44 to 8.20. The nitrogen content ranged from 1.77 to 2.18%, phosphorus from 0.17 to 0.38%, potassium from 0.77 to 0.90%, and sodium from 0.02 to 0.05%. In addition, the concentrations of heavy metals (Cr, Ni, As, Cd, Pb) were within acceptable limits for organic fertilisers. Studies have shown that granules made from compost and nettle slurry have favourable physicochemical properties that allow their use as a supplement to mineral fertilisation. They are characterised by an optimal pH value and a balanced content of key nutrients such as nitrogen, phosphorus, potassium, and sodium while maintaining acceptable concentrations of heavy metals. The results confirm that the tested materials meet standards for nitrogen, phosphorus, potassium, and heavy metals, confirming their suitability as safe and effective organic fertilisers. Their use can contribute not only to improving soil quality and increasing crop yields but also support sustainable development goals and fit into the concept of a circular economy.
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