First main plastic house crop in paper pots after 50 days i.e. 50 days after sowing. Black spruce, 1+0, container stock, paper pots.

A general view of plastic greenhouses to grow paper pots; each house can grow 2 million seedlings. Greenhouse.

A general view of transplant lines after enlargement of field. Black spruce, 2+2, transplants.

Chemically thinned with "gramoxone." Black spruce, 3+0, thinning.

Comparison of seedlings used for transplant stock: on left (yellow) seedlings from overwintered beds; on right those from stock lifted in fall and frozen stored until transplanting.

Rooted black spruce cutting taken from outstanding plantation tree. Black spruce, 1+0, cutting.

Details of harrows on Danish cultivator. Cultivation.

Cultivating a la Niels Kreiberg in transplant stock. Black spruce, 2+1, cultivating.

Details of mechanical harvester developed at nursery. Lifting, with harvester.

Seedling harvester developed at nursery, note manner of movement of seedlings to remove soil. Lifting, seedling harvester.