Maleic Hydrazide Unsuitable for Controlling Height Growth of Green Ash and Shumard Oak Seedlings
نویسنده
چکیده
In southern nurseries, hardwood seedlings often grow so large that they are difficult to lift and plant. In a study at the Southern Hardwoods Laboratory, maleic hydrazide (MH) was tested as a means of halting height growth when seedlings reach suitable size. Seeds of green ash (Fraxinus pennsylvanica Marsh.) and Shumard oak (Quercus shumardii Buckl.) were nursery sown during the summer of 1961. When the seedlings were 15 inches tall (August 1), 30,000 and 15,000 p.p.m. were applied as sprays; the sprays were in amounts sufficient to run off the leaves. A third area was left unsprayed. The spray was applied about 8 a.m.; a shower the night before had left the seedlings turgid. The treatments reduced height growth during the remainder of the season, but there was no Significant difference between MH levels (table O. The average height difference between treated and untreated seedlings was much greater for green ash than for Shumard oak. MH also slowed the diameter growth of green ash and apparently increased that of TABLE 2. --Average heights of green ash and Shumard oak after one growing season, depending on amount of MIl application
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