Which of the following is not an advantage of using manure?

Manure is a valuable organic fertilizer that can improve soil health and increase crop yields. However, it is important to consider the potential drawbacks of using manure. 

One of the disadvantages of manure as a fertilizer is that it can contain weed seeds and pathogens that can harm crops. 

Additionally, if manure is not properly composted, it can emit unpleasant odours and contribute to air pollution. 

Another potential disadvantage of manure is that it may contain high levels of salt, which can be harmful to some crops. 

However, it is important to note that these disadvantages can be minimized by properly handling, composting, and applying manure in accordance with best practices.