Bubba Gump

Some of the lower branch leaves started to turn yellow and kind of dried. I suppose it was the temperature because some days it raised to 30° C ( 86°F ) due to the hot weather here where I live. Could it be a deficiency in the fertilizer? some people say that Delta 9 is so strong tha if you don´t feed them right after using it some leaves might show deficiency due to the accelerated metabolism of the plant (there is even people who might feed the day before the application of Delta 9).