sound s like you need to apply land plaster before planting again.if potatoes have black spots inside its the same thing---if the tomato blooms fall of its a differant problem---also tomatos will grow get a tiny spot on bottom and rot from there.also dont groww tomatoes or other vegs in the same spot.with a small garden do a couple rows of corn then a couple rows of tomatoes or whatever then next year just reverse.concider what you are growing in a small garden and find produce that are simular on nutrition needs.potatoes<sweet and white,yellow>want potassium amnd potash where tomatoes dont---so have a seperate patch for potatoes,carrots,beets,etc anything.yes i have at times had a few harvests that werent found or friends stealing-----as i have aged 60--i seem to tolarate people sqrewing with my stuff less and less --shot a punk kid a few yrs back with a 410 shotgun.i gave him plenty of time to run and then let him know i wasnt happy.he hid under my neighbors car and told them i was trying to kill him.he just didnt say why he was in my back yard at 3:30 in the morning.sometimes it just aint worth it.i still try a few gorilla grows evry now and then for wife and my personal use.i buy cheap weed for the company--- i just cut a auto day before yesterday.pic in in outdoor grow section