Cucumber plants dying at bottom of stalk?

Question

I planted some Japenese Cucumber seeds and they popped up great, now the stalk has grown about 3 to 5 inches. I went out to check all my plants this morning and they all looked great. I went out that afternoon and the Cuc plant stalk at the bottom looked dead as a door k**b. It was green and strong in the morning and now it looks like a dehidrated pepper.

What could have happened? I have it planted in a 20 gallon pot and water it normally with 1.2 gallons of water every 3 days unless the average temp runs above the 90's then I will add a little water inbetween.

The pot is filled with black topsoil and a mixture of manure/compost. I also spray my plants with Serenade and organic spray for fungus and blite disease. (Spray treatment is done within manufacturers guidelines)

Some pics....

http://www.masteringthemarkets.com/forum//attachment.php?attachmentid=1105&d=1213317300

http://www.masteringthemarkets.com/forum//attachment.php?attachmentid=1106&d=1213317300

Answer 1

When you click on the link ..the page comes up with a logo in the middle saying "we are now a private site"...pictures would have helped..but you tried..get an account at photobucket.com and upload the photos then post that link here

Answer 2

your soil is lacking super phosphate, mix a handful in a bucket of water and sprinkle round the plant, you can save the others that way