I readthis paper titled as," Microbial response to CaCO3 application in an acid soil in southern China" which helps me a lot in my project . Although this paper insights the vast information. Sir I have a question and Query which I did not understand the table 1 on page no 3 and Fig 1 on page 4. Sir in Fig 4 you have mentioned b to control and so on. Can anyone please elaborate these words and what these alphabet represents. I will attach the Figure for your reference.