... behind N, P and K.Although most turf is built up on sand, which contains silicon dioxide, ... very important to use Silicon fertilizer.This product is ore fertilizer with pH of around 7, which ... the residual elements in the soil, cell-wall is thinner than before ,then the leaves become harder, so ... for use:Need watering for 5-10 minutes after applying, application rate is 15-25g per square metresgranular ...