When is the majority of phosphorus available in poultry litter with bedding?

The majority of phosphorus in poultry litter with bedding is available primarily in the first year. This is due to the decomposition process of the organic material present in the litter. In the initial stages post-application, the phosphorus is generally more soluble and easier for plants to uptake as the organic matter begins to break down. Factors such as microbial activity and environmental conditions during this time facilitate the release of phosphorus, making it readily available for crop assimilation.

As time progresses into the second year, the availability of phosphorus tends to decrease as the material continues to decompose and may become bound to soil particles, making it less accessible to plants. Thus, while some phosphorus may remain in the litter beyond the first year, its availability significantly diminishes compared to the first year, when it can have a more pronounced impact on crop growth and nutrient management strategies.