A film of a laboratory demonstration using a rain simulator shows clearly how Polysulphate fertilizer dissolves gradually, releasing plant nutrients to the growing crop.
From field to laboratory
Solubility is hard to see, let alone measure, at soil level in the field. But the behavior of granular Polysulphate fertilizer in the soil is replicable in a simulator. In a laboratory, granular Polysulphate is held in a tray and over a period of 160 hours it is ‘rained’ on. The simulated rainfall is at a rate of 10mm per hour.
Gradual and gentle nutrient release
Almost all of the Polysulphate dissolves during the test period, releasing all the nutrients for plant uptake. In the field, conditions would be different: the actual rainfall would affect the speed of dissolving. However the principle of the nature and the proportion of solubility is the same.
To see this demonstration of solubility in detail watch the film Demonstrating Polysulphate fertilizer solubility with a Rain simulator available now on the Polysulphate YouTube channel.