3897
It was found that when soybean seedlings were treated with 1 . 5 mg / L BPA , the growth of roots was improved , the content of nitrate in roots was increased , the content of ammonium in roots was decreased , and the activities of nitrate reductase and nitrite reductase in roots were not changed .
 Chemical: BPA; Chemical: nitrate; Chemical: ammonium; Chemical: nitrate; Chemical: nitrite
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: BPA; Chemical: nitrate; Chemical: ammonium; Chemical: nitrate; Chemical: nitrite