Nutrient Requirements of Kauri Pine On a Lateritic Podzolic Soil in Southern Queensland

SUMMARY

Field trials undertaken to determine the nutrient requirements of kauri pine (Agathis robusta C. Moore) on a lateritic podzolic soil in coastal south Queensland are described. The primary limiting nutrient was nitrogen and very little growth occurred unless this element was added. Phosphorus depressed height growth in the absence of fertilizer nitrogen but increased growth when nitrogen was present. A slight response was obtained to potassium and to a trace element mixture containing copper, zinc, boron and molybdenum; the latter treatment improved the potassium status of the trees.