DAP fertilizer, also known as diammonium phosphate, is a type of fertilizer that is commonly used in agriculture to provide plants with essential nutrients such as nitrogen and phosphorus.DAP fertilizer is highly water-soluble and therefore easily absorbed by plants. It is often used as a starter fertilizer for crops, especially those that require high amounts of phosphorus, such as corn, wheat, and soybeans. It can also be used as a topdressing fertilizer for established crops to supplement their phosphorus and nitrogen needs..While DAP fertilizer can be highly effective in improving crop yields, it is important to use it in appropriate amounts and with proper timing to avoid potential negative impacts on the environment. Overuse of DAP fertilizer can lead to nutrient runoff and contamination of water bodies, which can harm aquatic ecosystems and contribute to algal blooms.

Rock phosphate is often used in organic farming as a natural alternative to chemical fertilizers. It is slowly released into the soil over time, providing a long-lasting source of phosphorus for plants. It is also beneficial for soil health as it can improve the soil's physical properties and increase microbial activity.