Volume 45 Number 4 Article 13
Year 1991 Month 10
Title: Rooting Characteristics of Apple Rootstocks at Two NC-140 Trial Locations
Authors: R. Thomas Fernandez, R.L. Perry and D.C. Ferree
Abstract:
Root distribution of nine apple rootstocks at
the Michigan and Ohio sites for the 1980 NC-
140 Uniform Apple Regional Rootstock Trial
was determined using the trench profile method.
Cultural practices and training systems were
similar at the two sites.
The two locations
differed greatly in soil type, a Marlette fine
sandy loam at Michigan and a Canfield silt
loam with a fragipan at Ohio.
Roots were
counted and separated into three size categories:
less than 2 mm in diameter, 2 to 5 mm in
diameter and greater then 5 mm in diameter.
Number of roots counted per tree could be
separated into 3 rootstock groups for the Michi
gan location: MAC.24 with the most roots count
ed per tree; OAR 1, M.26 EMLA and M.9
EMLA as the intermediate group; and M.7
EMLA, O.3, M.9, MAC.9 and M.27 EMLA with
the least.
In Ohio MAC.24 was the only rootstock
that was clearly distinguishable from the
others.
Percent of roots was greatest for all
rootstocks at both locations for the less than 2
mm size and least for the greater than 5 mm
size.
Percent of roots smaller than 2 mm was
greater at the Michigan than the Ohio location.
Percent of roots in the 2 to 5 mm and the greater
than 5 mm categories was greater for the Ohio
than the Michigan location.
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