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Hello,
The effect of miracle grow on fruit set may be due
to a prepollination effect on ovule development. Ovule development occurs as the
flower opens and not all flowers have functional ovules. With increased N
availability at this time the proportion of flowers with functional ovules may
be increased. The effect may also be post-pollination in that the
increased N availability may inhibit the abortion of fruit with few seed. (This
taken from Faust: Physiology of temperate zone fruit trees, a mighty fine book)
Kristine, zone 3
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