A hot soldering iron can make nice neat holes in the bottoms of plastic cups and pails without cracking.
Special Thanks to:
Gentle Readers everywhere.
General Hydroponics - FloraMicro
Micronutrient values may show a zero value for missing data. Over time the dataset will improve, but keep in mind that in some instances; especially with natural materials, the listed values given are rough estimates and will vary with samples from different sources.