60 Percent would probably be overkill, causing leggy-ness in the crops.
This year im using 50 on my lettuce. The secret is also using micro sprinklers. Found at Lowes in the aisle with drip irrigation stuff. I just upped the time to every 4 hours, from the previous 6 hours. They run 5 minutes. Just enough to cool everything down.
Within a couple day after installing the shade cloth, I noticed increased growth.
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