It could take a few weeks before a seedlings root system is actively searching soil
for nutrients.
Sowing a dry seed coat, waking the embryo, emergence....barely the beginning of a
root and all food needed is contained in its own little seed cell. A couple weeks,
sometimes three before much interaction with surrounding soil. The soil is just providing the
needed moisture for germination. Why we mist the top for the few days after
sowing.
At the same time the nasty soil is getting nice and oxygenated and steady damp. yum.
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