Your seedlings need ferts. That is why the lowest leaves are turning yellow.
Your soil did have a low dose of nutes in it. But, I am willing to bet this is just a water soluble fert sprayed onto it to get the plants you tranplant into it a quick boost. (It should not advertise lasts 3 months or something because this can burn seedlings) Being water soluble, its long gone and probably has been washed from the soil...some of it at first wetting. There is nothing left except hopefully dolomite lime.
Promix is ready to go out of the bag. You can plant directly into it. You will be adjusting your fert water ph to 5.8 to 6 so the soil will go toward this if a little low or high in ph. Don't add more lime to compensate for the fact that dolomite lime gets washed from the soil and breaks down. You add gypsum and epsom salts to get more calcium and magnesium every third fert or so to boost levels with dolomite lime and when you need a boost or the dolomite lime is almost gone you can add these 2 everytime. It does not harm the plant at 1/4 teaspoon of both per gallon of water.
20-20-20 is twice as concentrated as 10-10-10. You would use 1/2 as much 20-20-20 as 10-10-10 to feed the same amount. Peters 20-20-20 is handy to have around because its considered high in phosphorus. This might be good for the seedlings first feed. 1/4 teaspoon per gallon = 60 ppm nitrogen. When the seedlings begin growing, increase this to 100 ppm nitrogen or a little less than a 1/2 teaspoon.
Peters and alot of cheap ferts have the source of nitrogen as urea or ammonia. Alot is not desirable. You should have at least 50% nitrate nitrogen or more in your ferts with little urea or ammonia. See the checklist I posted before about what to look for in a fert for veg.
Stickyicky had the same problem as you. Not knowing if he needed to apply ferts to his soil cause they had some to start. At my suggestion, he applied some and now they are budding. Here is his story...http://www.icmag.com/ic/showthread.php?t=35711&page=6&pp=15
Your soil did have a low dose of nutes in it. But, I am willing to bet this is just a water soluble fert sprayed onto it to get the plants you tranplant into it a quick boost. (It should not advertise lasts 3 months or something because this can burn seedlings) Being water soluble, its long gone and probably has been washed from the soil...some of it at first wetting. There is nothing left except hopefully dolomite lime.
Promix is ready to go out of the bag. You can plant directly into it. You will be adjusting your fert water ph to 5.8 to 6 so the soil will go toward this if a little low or high in ph. Don't add more lime to compensate for the fact that dolomite lime gets washed from the soil and breaks down. You add gypsum and epsom salts to get more calcium and magnesium every third fert or so to boost levels with dolomite lime and when you need a boost or the dolomite lime is almost gone you can add these 2 everytime. It does not harm the plant at 1/4 teaspoon of both per gallon of water.
20-20-20 is twice as concentrated as 10-10-10. You would use 1/2 as much 20-20-20 as 10-10-10 to feed the same amount. Peters 20-20-20 is handy to have around because its considered high in phosphorus. This might be good for the seedlings first feed. 1/4 teaspoon per gallon = 60 ppm nitrogen. When the seedlings begin growing, increase this to 100 ppm nitrogen or a little less than a 1/2 teaspoon.
Peters and alot of cheap ferts have the source of nitrogen as urea or ammonia. Alot is not desirable. You should have at least 50% nitrate nitrogen or more in your ferts with little urea or ammonia. See the checklist I posted before about what to look for in a fert for veg.
Stickyicky had the same problem as you. Not knowing if he needed to apply ferts to his soil cause they had some to start. At my suggestion, he applied some and now they are budding. Here is his story...http://www.icmag.com/ic/showthread.php?t=35711&page=6&pp=15
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