Retention and release of nutrients from polyhalite to soil
| Autor: | Luke Harrold, Timothy D. Lewis, Graeme I. Paton, Paul D. Hallett |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Chemistry
Magnesium Polyhalite Potassium Soil Science chemistry.chemical_element 04 agricultural and veterinary sciences 010501 environmental sciences engineering.material Calcium complex mixtures 01 natural sciences Pollution Nutrient Environmental chemistry Leaching (pedology) 040103 agronomy & agriculture engineering 0401 agriculture forestry and fisheries Soil horizon Fertilizer Agronomy and Crop Science 0105 earth and related environmental sciences |
| Zdroj: | Soil Use and Management. 36:117-122 |
| ISSN: | 1475-2743 0266-0032 |
| Popis: | Recent discoveries of polyhalite (K₂SO₄.MgSO₄.2CaSO₄.2H₂O) in the UK provide an alternative to conventional fertilizer sources. This work investigated the interaction of polyhalite, commercially known as POLY4, with soil using leaching columns. Different physical forms of polyhalite (powder, crushed rock and granules) were compared to potassium chloride (KCl) for the movement of potassium, calcium, magnesium and sulphur (as sulphate) through the soil profile using 19.7 L of water, equivalent to 4,500 mm rainfall. The nutrients from polyhalite were found to be available at 30 cm depth, with calcium showing signs of interacting with the soil clay particles to release cationic nutrients. Polyhalite granules showed the greatest release of sulphate, magnesium and calcium as a proportion of the additional nutrient with 127%, 71% and 102%, respectively leached. For potassium, all forms of polyhalite had greater release than KCl (powder = 58%; granules = 86%; crushed rock = 57% and KCl 16%). Nutrients from polyhalite and those mobilized from soil interactions are present in soil solution indicating availability for plant growth. |
| Databáze: | OpenAIRE |
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