Eucalyptus Seedlings per Hectare

Eucalyptus seedlings per hectare

To get the seedling count, use seedlings/ha = 10,000 / (row spacing · in-row spacing), with the spacings in meters. The patterns you see most often in Brazil are 3 × 2 m = 1,667 trees/ha (the pulpwood standard), 3 × 3 m = 1,111 trees/ha, and 3.5 × 2.5 m = 1,143 trees/ha, which targets sawlogs. So 3 × 2 m works out to 10,000 / 6 = 1,667. Open the spacing up and you plant fewer trees and the canopy takes longer to close, but each log comes in thicker, which suits sawnwood and posts. Pack them tighter and you squeeze more biomass per hectare for cellulose and charcoal, at the cost of a shorter rotation. IBÁ (Indústria Brasileira de Árvores) reports ~7.6 Mha of planted eucalyptus in Brazil.

Applications

It shows up in commercial silviculture for cellulose (Suzano, Klabin), charcoal for steelmaking, sawnwood, posts and energy biomass. It also helps when you're laying out machinery rows and sizing a seedling nursery.

FAQ

Why is 3 × 2 m the most common spacing? It hits a sweet spot between how fast the canopy closes, the MAI (mean annual increment) and room for harvest machinery, which is what 6–7-year cellulose rotations need.

Does wider spacing always mean thicker trunks? On average it does. With more light, water and nutrients reaching each tree, competition drops and the DBH (diameter at breast height) ends up larger.

What about clones? Clonal eucalyptus runs on the same density math. What you gain there is genetic uniformity, not a different geometric formula.