For efficient utilization of manure by crops, when should manure be applied?

Applying manure to meet phosphorus needs is considered effective for several reasons. Phosphorus is a crucial nutrient for plant growth, particularly for root development and energy transfer within the plant. When manure is applied to meet phosphorus requirements, crops can benefit from the nutrient's presence in the soil at critical growth stages, ensuring they receive adequate phosphorus for optimal development.

Additionally, this strategy helps manage the nutrient content in the soil. Since manure often contains both nitrogen and phosphorus, applying it to balance phosphorus levels can prevent nutrient imbalances that might arise if only one nutrient is focused on excessively. Timing the application based on phosphorus needs could also align with the crop growth cycle, allowing for better nutrient uptake during peak demand periods.

In contrast, using manure solely to meet nitrogen or moisture requirements may not effectively utilize the phosphorus contained within the manure. Moreover, applying manure when the soil is dry does not optimize nutrient absorption by crops and can lead to increased runoff and environmental concerns. Thus, aligning manure application with phosphorus needs supports both crop growth and sustainable nutrient management practices.