Hello! When i started work with 1-3 fields i hadn't problems with humus and their fertilize, but when i created additional fields i understood that fertilize every field it's very annoying process. I propose to create additional function for fields (Fertilize). When you clcik right mouse button on the field, you can see function so as, Inspect and Fertilize. When you click at fertilize you can choice, how many humus you will want to fertilize in field (in this option we can use count tab, which we see when split money).
Thanks for your attention and have a nice day!