Issue growing outdoors

Growing outdoors in sheep manure/promix tested my ph of soil with bluelab soil ph tester and it’s at 7 . Anyone have any idea why the tops are starting to die like this ? Thanks

I think u need to drop the ph to 5.5 at least.

looks like a sunburn to me. Make sure your plant has enough moisture in the root zone when the sun is as the strongest in the afternoon.