We have to use fertilizers and fungicides or any other pesticides simultaneously for the growth and development as well as protection of crops from diseases or insects or any kinds of pests. But before using them at a time we should have to know whether they are compatible or incompatible. Copper fungicides like Bordeaux mixture is a popular fungicide which is commonly used in Bangladesh for protecting disease of crops. So, it is very important to know which fertilizers are compatible with copper (Cu) fungicides?