4568
The BLM approach , which incorporated competition of Mg ( 2 + ) with Cu ( 2 + ) to occupy the biotic ligands on root surfaces , was developed to predict Cu rhizotoxicity and accumulation by grapevine roots .
 Chemical: Mg ( 2 + ); Chemical: Cu ( 2 + ); Chemical: Cu
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Mg ( 2 + ); Chemical: Cu ( 2 + ); Chemical: Cu