Nutritional and Sexual Responses of Jack Pine to Ammonium Nitrate and Gibberellins
The nutritional and sexual responses of jack pine (Pinus banksiana Lamb.) seed orchard trees to NH4NO3 fertilization and GA4/7 foliar sprays were examined in seedling and grafted orchards at an Ontario location where soils were low N acidic sandy loams and in a Saskatchewan grafted orchard on high N calcareous sandy clay loams. High seed strobilus abortion and low pollen strobilus production and seed yields characterized the Saskatchewan trees. NH4NO3 fertilizer increased soil NH4+ and NO3- at both locations, current-year needle N and Mg in Ontario, Fe in Saskatchewan, and Ca at both locations, seed strobilus initiation and seed yields in Ontario; it decreased K in Saskatchewan. GA4/7 increased needle senescence and current-year needle N and P at both locations, K at Saskatchewan, seed and pollen strobilus initiation in Ontario, seed strobilus initiation and abortion in Saskatchewan, and seed yields per tree in Ontario; it decreased Ca at both locations, Mg at Saskatchewan, and diameter increments the year following treatments in Ontario. NH4NO3 and GA4/7 treatments did not interact for strobilus counts. Sexual expression varied with clones in Saskatchewan but not with families in Ontario. Clones interacted with GA4/7 but not NH4NO3 for seed strobilus initiation. For. Sci. 45(1):136-153.
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Document Type: Journal Article
Affiliations: 1514 Edgeclifse Cliff Avenue, Ottawa, Ontario K1Z 8G1
Publication date: 1999-02-01
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