Transplanting and Fertilizing Seedlings

Q.  How soon do we transplant our seedlings?  And what fertilizer do we put in the seedling flats?  Do we continue to water with plain water?
A.  it’s best to wait until the plant has at least one set of true leaves before transplanting.  I have transplanted when the plants only had their seed-leaves,  but the plants do better when they’re a little stronger, with leaves that can photosynthesize better.
Put 40 grams (1 1/2 ounces, or 3 tablespoons) of Pre-Plant mix plus 20 grams (3/4 ounce or 1 1/2 tablespoons) of Weekly Feed in each 18″ X 18″ flat of soil mixture when doing seedling transplanting, and 2/3 those amounts if using 10″ X 20″ plastic trays.
It’s important to understand the difference between planting seeds and transplanting seedlings.  When planting seeds, germinating seeds are subject to being burned by any Weekly Feed fertilizers, and so we only put in the Pre-Plant calcium, etc. which will not burn, and water with plain water.  Then as soon as we see plants emerging we begin feeding with the Dilute Fertilizer Solution of 450 grams (16 ounces) in the 55 gallon (210 liter) barrel.  That translates into 1 ounce (28 grams) in 3 gallons (12 liters).
But seedlings being transplanted are best served by having a little Weekly Feed in the soil mixture, as well as the Dilute Fertilizer Solution in their daily water.