Performance of Grevillea robusta A. cunn. ex r. br. under different farming and spacing regimes

Silver oak (Grevillea robusta) is one of the important tree species in Agroforests of Kodagu, India. The present study generated information on growth performance and yield of the species in different farming situations at different spacing and ages. The results indicated that the spacing and farming situation has a pronounced effect on growth (diameter at breast height, height, basal area and volume of individual trees) of silver oak at different ages. At the age of five, the average diameter at breast height (DBH) varied significantly under different farming situations with values ranging from 12.74 cm (monoculture) to 13.69 cm (silver oak with coffee). The effect of spacing and farming situations was not found to be significant on survival rate in most of the ages. The influence of farming systems on yield was observed at the age of five years, where there was significant variation on average volume per hectare with highest yield under monoculture (10.44 m³ha⁻¹) followed by silver oak with coffee and pepper (9.75 m³ ha⁻¹) and silver oak with coffee (7.01 m³ ha⁻¹).