Impact of Site Preparation on Wind Resistance of Young Pinus radiata

Abstract

Young trees were damaged by winds blowing at 39 m/s speed in the southern Cape Province. The frequency and the extent of wind damage was investigated in an establishment experiment comprising four methods of soil cultivation, two levels of weed control, and two size classes of planting stock. The incidence of tree damage was higher for augering or pitting than for discing or ripping. The significant variables required to predict the incidence of wind damage included: soil phosphorus and nitrogen contents, penetration resistance, weed cover, height and biomass, soil water retention, and ground water tables.