Solarizing

So, I came to the realization that solarizing (at least in my garden) is not going to build up enough heat to kill seeds. That would have to reach 160 degrees down to about a foot depth. Instead, it has a different method of working. 

What it actually does is build enough heat and moisture for seeds to germinate. Then deprives them of energy, so the plants that sprout die off as their roots become exhausted. Plus microbes feed on material in the deeper soil. 

What I have seen is a huge spike in snail and sow bug population as they feed on the debris. 

Understanding the process lets me know why it takes as long as it does. It also tells me it may be safe to remove most of the plastic in the next few weeks because that process will be mostly or entirely complete. The exception is the two most recently covered sections. Those will remain covered the rest of the season. 

However, in general I have found extensive value in this and some areas of the ground will be routinely covered every year from now on. It helped the tomatoes so much I'll keep this practice. Helps with weeds, grass, insects and moisture stability. Lower branches don't get yellowed even if they hang on the ground because irrigation is under the plastic. I was worried about soil oxygen but the plants absorb enough through the leaves. 

I am hoping it will also help the pumpkins. I may keep some additional areas covered where longer crops grow which were started in pots. Only uncovering where I want to direct plant carrots and such.