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Boron Deficiency in Pinus radiata And P. pinaster

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In Pinus radiata and P. pinaster boron deficiency produces characteristic injuries to first year shoots following an initial period of normal elongation. "Shoot dieback" is marked by death, needle loss and distortion of an unlignified outer portion, above a transition zone with shortened discolored needles and maculate pith; abundant fascicle shoots arise below. In "tip dieback" only the shoot apex is damaged but elongation and needle length are reduced, and fascicle meristems are stimulated to form buds. Occurence and severity vary within wide limits. Affected trees have less than 8 ppm B in undamaged first year needles. Borax applications prevent dieback and increase growth.

Document Type: Journal Article

Affiliations: Principal Scientific Officer, Forest Research Inst., Rotorua, New Zealand

Publication date: December 1, 1965

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