Organic Manure $P_2O_5$ Content Comparison

This solution identifies the concentrated organic manure with the highest percentage of phosphorus pentoxide ($P_2O_5$) from the options provided.

Manure $P_2O_5$ Content Table

Analysis of $P_2O_5$ Levels

Comparing the typical phosphorus pentoxide ($P_2O_5$) content in each manure:

• Raw bone-meal stands out with the highest $P_2O_5$ content, typically between 10% and 15%.
• Fish manure offers a moderate amount of $P_2O_5$, usually 3-5%.
• Poultry manure contains approximately 1.5-3% $P_2O_5$.
• Neem cake generally has the lowest $P_2O_5$ percentage, around 1-2%.

Conclusion

Based on the nutrient analysis, Raw bone-meal provides the highest percentage of $P_2O_5$ among the listed concentrated organic manures.