Control plot no fertilizer addition to Douglas fir. Razès.

Norway spruce planted 1967, 6 years. Person is Professor George Switzer (Mississippi State University). Razès.

Douglas plot with N, P, K and Cu added. c.f. slide 989 and note the difference in growth and colour. Razès.

Nitrogen deficiency in Norway spruce planted 1967, 6 years. Razès.

Copper deficiency in Douglas fir. n.b. crook in stem. Razès.

Copper deficiency in Douglas fir. n.b. crook in stem which is a symptom of Cu deficiency. Razès.

Copper deficiency in Douglas fir. n.b. crook in stem which is a symptom of Cu deficiency. Razès.

Oil profile-sol brun acide. Heathland, that has been cultivated then planted with Douglas fir which now has a copper deficiency. Razès.

Root system of 8 year old Douglas fir. n.b. how limited the system is. Dussac, Dordogne.

Root system of 8 year old Douglas fir. n.b. how limited the system is. Dussac, Dordogne.