Development of a Slow-Release Fertilizer and Its Efficiency Test

A new slow-release fertilizer was developed by laboratory and cultivated trials. Selected by the soluble rate of the treatments designed by orthogonalty design, its components include urea formaldehyde(N source), CaHPO4 (P source), methyl cellulose(adhesive), K, Mg, S and all microelements. It was tested that its efficiency is long than 14 months, and 7.5 g of it per kilogram soil (in particles) is more suitable than other treatments. It is profitable for gardening of saving time from management.