Volume 45 Number 4 Article 9
Year 1991 Month 10
Title: Dry Matter Partitioning in 'Starkspur Supreme Delicious' on Nine Rootstocks
Authors: D. Strong and A. Miller-Azarenko
Abstract:
The dry matter partitioning to vegetative and
reproductive components of 'Starkspur Su
preme' on 9 rootstocks in the 1980-81 NC-140
apple rootstock trials was determined in 1990.
Trees on MAC.24 and M.7 EMLA had the
heaviest aboveground dry weight and the lowest
harvest index (HI); M.26 EMLA trees were
intermediate for both. 'Starkspur Supreme' on
OAR 1, O.3, M.9 EMLA, M.9, MAC.9 , and
M.27 EMLA accumulated the least dry matter
and had the highest Hi's.
Total aboveground
dry weight in March ranged from 40.8 kg for
MAC.24 to 1.5 kg for M.27 EMLA. Hi's ranged
from a high of 0.55 for M.27 EMLA to 0.36 for
MAC.24. Trees with less aboveground dry
weight partitioned a higher percentage of their
total to spurs and spur leaves.
The percent of
spur dry weights ranged from 8.1 for M.27
EMLA to 2.1 for MAC.24. Spur leaf dry weight
percentages ranged from 6.0 for M.27 EMLA to
2.7 for MAC.24.
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