The incorrect statement about fertilizers is option 1: "Urea is a phosphorus-containing fertilizer." Urea is actually a nitrogen-containing fertilizer and does not contain phosphorus.

Option 2 is a correct statement. The application of fertilizers to the soil increases the soil`s fertility by providing essential nutrients to plants, such as nitrogen, phosphorus, and potassium. These nutrients are necessary for plant growth and development.

Option 3 is also correct. Urea can be synthesized by combining ammonia and carbon dioxide under high pressure and temperature conditions. This reaction produces urea, which is a common and widely used nitrogen fertilizer.

Option 4 is a correct statement. Urea does contain more nitrogen compared to other types of fertilizers. It typically has a nitrogen content of around 46%, making it a concentrated source of nitrogen for plants.

To summarize, the incorrect statement is option 1, as urea does not contain phosphorus.