What type of fertilizer is known for immediate nutrient availability?

Synthetic fertilizer is known for its immediate nutrient availability due to its formulation, which typically includes concentrated amounts of nutrients in readily soluble forms. These nutrients, such as nitrogen, phosphorus, and potassium, are chemically synthesized, allowing them to be quickly absorbed by plants upon application. This immediate impact can lead to rapid plant growth and a swift response in health.

In contrast, organic fertilizers are derived from natural sources and may take longer to break down and release nutrients, leading to a slower release of nutrients into the soil. Similarly, slow-release fertilizers are specifically designed to release nutrients gradually over time, providing a prolonged feeding effect but not the immediate availability that synthetic fertilizers offer. Green manure, which involves incorporating specific crops into the soil to improve fertility, also takes time to decompose and enhance soil nutrients.

Therefore, the option that best represents immediate nutrient availability is synthetic fertilizer, highlighting its effectiveness for quick nutrient delivery to plants.