Phosphorus fertilizer utilization rates typically range from 10% to 25%, meaning that a large portion of the applied phosphorus remains in the soil. As a result, phosphate fertilizers have a long residual effect. Studies show that after continuous annual applications, the cumulative effectiveness of phosphate fertilizers can last for 5 to 10 years, with about 50% of the applied phosphorus still available to crops. Therefore, when there is a shortage of phosphorus, it's possible to re-apply it every 2 to 3 years, as the previously applied phosphorus can still meet the crop’s needs.
In short, applying phosphate fertilizers effectively requires considering multiple factors, such as soil conditions, the characteristics of different phosphorus fertilizer types, the nutrient requirements of the crops, and the application methods. It's also important to maintain a balanced ratio between nitrogen and phosphate fertilizers, taking into account their long-term effects. Additionally, if the soil lacks potassium or essential micronutrients, these should not be overlooked, as they can become limiting factors in plant growth. By addressing all these elements, the efficiency and overall effectiveness of phosphate fertilizer use can be significantly improved.
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