Silicon is one of the most abundant elements found in soil, comprising 50-70% of soil mass, and some plants have been shown to accumulate large amounts of silica in their tissues. In fact, silica can often accumulate in plant tissues to higher levels than calcium, magnesium and phosphorus! But because of the relative abundance of silica in quartz-based sand and its lack of obvious deficiency symptoms in plants, agronomists have largely ignored the use of silicon as a fertiliser. Lately, however, some agronomists are taking a second look at silica. Although silicon is still not recognised as an “essential” element, its beneficial effects on plant growth are well documented… improving stress tolerance, disease resistance and yield for a wide range of plants.