Nutritional Disorders and Fertilizer Trials in Pinus radiata Stands in Waimea County, Nelson

Authors: E.J. Appleton, L.J. Slow
Publication: New Zealand Journal of Forestry, Volume N.Z.J.For. 1966, Issue N.Z.J.For. 11(2) 1966, pp 185-201, Aug 1966
Publisher: New Zealand Institute of Forestry

---

Abstract: Nutritional disorders in Pinus radiata stands in Waimea County are caused primarily by nitrogen or boron deficiency. Growth in nitrogen-deficient stands can be increased appreciably by nitrogenous fertilizers, but the improvement may be only temporary. Leguminous plants seem to offer an alternative means of supplying nitrogen, but the establishment of most species is difficult under local conditions and fertilizer applications are necessary to promote vigorous growth. Gorse (Ulex europaeus) is a common weed species in the district and will supply nitrogen to adjacent trees, provided adequate phosphorus, boron and other nutrients are available.
Boron deficiency is widespread and symptoms often appear in stands treated with nitrogenous fertilizers. Foliar sprays and applications of boron fertilizers correct the deficiency. Phosphorus is also a limiting factor on some sites and on others there are indications of responses to magnesium.
Many fertilizers cause severe mortality if in direct contact with the roots of seedling trees but are normally safe to use alongside the planting hole. The treatment of boron deficiency and the application of fertilizers at or soon after planting is now routine in some areas.

---