While I Usually implement MKP being a foliar sprays, from time to time I will use it like a soil drench for my durian saplings. three. Implement the fertilizer. Potassium sulfate fertilizer may be applied to the soil at any time of year, however it is best to use it https://organicpotassiumsulphatef03467.mybuzzblog.com/13523231/the-basic-principles-of-best-sop-fertilizer-for-rice-farming