Potassium deficiency in Corsican pine. Saint-Front, Dordogne.

Potassium deficiency in Corsican pine. Saint-Front, Dordogne.

Norway spruce planted on large clearcut (coup a blanc). Poitiers.

Norway spruce planted on large clearcut (coup a blanc). Poitiers.

Maritime pine. Person is Professor Douglas Malcolm (Edinburgh). Les Landes.

View of fertilizer and drainage. Large trees had both, smaller trees had fertilizer only. Mimizan.

Tower view of area of fertilizer trials. Mimizan.

Fertilizer trial in maritime pine, 14 years. n.b person at control plot is W. Pritchett (University of Florida).

One-way disk plow. La Mouliere, Les Landes.

Disk plow, La Mouliere. Les Landes.