Applying Phosphate Fertilizer to Wheat

Wheat is one of the crops that requires a significant amount of phosphorus for optimal growth and yield. Proper application of phosphate fertilizer plays a crucial role in improving its efficiency, lowering costs, and promoting both high-quality and high-yield wheat production. By adopting scientific methods, farmers can maximize the benefits of phosphate fertilizers while minimizing waste and environmental impact.

1. Mixing with Organic Fertilizer Before Application

Organic fertilizers are rich in organic matter, phosphoric acid, and various weak organic acids that help convert insoluble phosphorus into a more soluble form, making it more available to plants. When combined with phosphate fertilizer, this mixture reduces the contact area between the fertilizer and the soil, thereby decreasing phosphorus fixation. This method not only enhances the utilization of phosphate fertilizer but also helps prevent nutrient loss and improves overall soil health.

Recommended Method: Mix 1 part of phosphate fertilizer with 10–20 parts of well-rotted organic fertilizer, then pile and cover it with mud to promote fermentation. This process enhances nutrient availability and supports long-term soil fertility.

2. Combining with Nitrogen, Potassium, and Zinc Fertilizers

To meet the nutritional needs of wheat, it’s important to apply nitrogen, potassium, and zinc fertilizers alongside phosphate fertilizer. This combination helps replenish deficient nutrients in the soil and boosts the efficiency of phosphate fertilizer by up to 20–30%. For high-yield fields, a common recommendation includes 4,000 kg of quality organic fertilizer per acre, along with 50 kg of standard phosphate, 30 kg of nitrogen, 12 kg of potassium, and 1.5 kg of zinc sulfate in zinc-deficient areas. Adjustments may be made depending on soil conditions and crop requirements.

3. Concentrated Application

Applying phosphate fertilizer in concentrated bands or strips reduces its contact with soil particles, thus minimizing phosphorus fixation and increasing absorption. This technique can improve phosphate utilization by about 28% and boost wheat yields by approximately 12%.

4. Using Appropriate Types of Phosphate Fertilizer Based on Soil pH

In neutral or calcareous soils, water-soluble superphosphate is recommended due to its weakly acidic nature, which helps neutralize soil alkalinity. On acidic soils, calcium magnesium phosphate (a weakly alkaline fertilizer) is more suitable. Using the right type of phosphate fertilizer not only improves soil fertility but also protects wheat roots from acid damage, ensuring healthier plant development.

5. Applying the Right Amount

The relationship between phosphate fertilizer application and wheat yield is not linear. As the amount of phosphate increases, the yield per kilogram of fertilizer tends to decrease. However, applying too little may not result in noticeable yield improvements. A general recommendation is to apply 50–60 kg of phosphate fertilizer per mu (approximately 667 square meters), depending on soil fertility and crop demand.

6. Foliar Spraying

Foliar application is an effective way to supplement phosphorus directly to the leaves. One method involves soaking 2–3 kg of superphosphate in clear water, filtering out the residue, and mixing it with 50–60 kg of fresh water. Spraying during key growth stages—such as jointing, booting, and grain filling—can increase yields by 4–6%. Another option is to spray a 0.2% solution of potassium dihydrogen phosphate at a rate of 60–80 kg per acre, repeating the application three times. This technique strengthens the stalks and can boost yields by 4.6–8.1%.

Source: Nongbo.com

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