"This USDA website will not be updated during a lapse in federal funding. Content on this website will not be current or maintained until funding issues have been resolved. However, if there is information that affects security, life, and property, this website will continue to update that information during a funding lapse."

Home Publications Tree Improvement and Genetics Southern Forest Tree Improvement Conference 13th Southern Forest Tree Improvement Conference (1975) Fertilizer Timing And Formulation Affect Flowering In A Loblolly Pine Seed Orchard

Fertilizer Timing And Formulation Affect Flowering In A Loblolly Pine Seed Orchard

Fertilizer trials in a Mississippi seed orchard showed that N stimulated flowering, P did not, and N + P was no better than N alone. Of three nitrogen sources tested, NH4NO3 proved most effective in one experiment; but response to NH4NO3 and to NaNO 3 was about the same in another experiment. Fertilizing in mid to late summer produced the greatest increase in flowering (as much as 300 percent); the best treatment (fertilized July 26) tripled cone yield and quadrupled yield of sound seed. Fertilized ramets were no taller than controls, but diameter growth was improved by treatments. Clone x treatment interactions were always significant.


Download this file:

PDF document Download this file — PDF document, 396Kb

Details

Author(s): Ronald C. Schmidtling

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1975

Personal tools