Derivation of fertiliser regimes for radiata pine nurseries with contrasting soils.  P. Hopmans and D. W. Flinn.  March 1983.  11 pp. (unpubl.)

SUMMARY

The nutrient status of Pinus radiata D. Don (radiata pine) seedlings raised in 1981 in three Victorian nurseries, under a balanced fertiliser regime based on estimated nutrient requirements, was compared with that of the 1975 seedling crops. Concentrations of the eight nutrients examined in the 1981 crops were generally at levels considered to be desirable for satisfactory seedling growth; this represented a significant improvement in seedling nutrient status compared with earlier crops. However, fertiliser efficiency was low for the macro-nutrients, and there was evidence of increased salinity in the surface soil at one of the nurseries following substantial pre-sowing fertiliser applications.

Modified fertiliser regimes are outlined that take into account both soil nutrient reserves immediately prior to sowing and estimated nutrient requirements of the seedling crop. The modified regimes place emphasis on the use of foliar fertilisers and side dressings during the growing season to improve fertiliser efficiency and reduce the likelihood of salting. In addition, a three-year crop rotation has been intensified in the three nurseries in an attempt to maintain soil structure and fertility. This involves several green crops over a period of 18-20 months followed by a short fallow period prior to sowing of the P. radiata crop.

Also published:

Hopmans, P and Flinn, D.W. (1983) Nutrient requirements in three radiata pine nurseries with contrasting soils.  Aust. For. 46 (2): 111-17.