15541
The sources of nitrogen used were 100 % urea ( 70 kg N ha ( - 1 ) ) , 75 % urea ( 52 . 5 kg N ha ( - 1 ) ) + 25 % Azocompost ( 3 . 85 tonha ( - 1 ) ) , 50 % urea ( 35 kg N ha ( - 1 ) ) + 50 % Azocompost ( 7 . 77 tonha ( - 1 ) ) , 25 % urea ( 17 . 5 kg N ha ( - 1 ) ) + 75 % Azocompost ( 11 . 55 tonha ( - 1 ) ) , and 100 % Azocompost ( 15 . 55 tonha ( - 1 ) ) .
 Chemical: nitrogen; Chemical: urea; Chemical: urea; Chemical: urea; Chemical: urea
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: nitrogen; Chemical: urea; Chemical: urea; Chemical: urea; Chemical: urea