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Hi,/ading thru the post I came upon a few growers having problems growing lettuce in hot weather. Well I live in South America and I am growing leaf lettuce semi-commercially. Our daily temp is often over 80 F that is over 30 Celsius and in my growroom it is well 90 F that is 40 C . Tropical conditions and I have no problems save the bugs. My question, does anyone know a hydroponic solution with no ammonium and no ureum mixed as ingredients?