1、A comprehensive evaluation of the optimum amount of phosphate

A comprehensive evaluation of the optimum amount of phosphate fertilizer for drip irrigation of cotton under mulch based on root morphology, physiology, and mycorrhizal symbiosis

2、Phosphorus High

The plant-available soil phosphorus rate and methods for applying phosphatic fertilizer and soil P-fixation capacity are critical factors for lower cotton productivity in Southern...

3、Agronomic threshold of soil available phosphorus and the appropriate

At harvest of each year, soil were samples for determination of water-soluble P, Olsen-P, and total P content; the cotton yields were recorded, and cotton seeds and flocs samples were collected to measure P content and then calculate the P output by cotton.

Drip Irrigation of Phosphorus Fertilizer Enhances Cotton Yield and

This treatment consistently increased cotton yield by 30.41–39.09% (p < 0.05) compared to CK, demonstrating stable positive effects. This study highlights that adjusting P application methods can establish sustainable, high-yield agricultural fertilization systems.

Technical Regulation of Phosphorus Fertilizer Application

Can optimization of phosphorus input lead to high productivity and high phosphorus use efficiency of cotton through maximization of root/mycorrhizal efficiency in phosphorus acquisition [J].

Phosphorus uptake mechanisms associated with phosphorus application

When the available phosphorus content in the soil is optimal (15–20 mg kg −1), the root length, hyphal density, and apparent phosphorus recovery are all enhanced simultaneously (Mai et al., 2018).

Phosphorus fertilizer recommendation based on minimum soil surplus for

This result suggests that a total P fertilizer application rate of 33 kg ha −1 can be considered as the optimum P recommendation based on the P demand by local average lint yield.

A comprehensive evaluation of the optimum amount of phosphate

A comprehensive evaluation of the optimum amount of phosphate fertilizer for drip irrigation of cotton under mulch based on root morphology, physiology, and mycorrhizal symbiosis

Phosphorus High

The plant-available soil phosphorus rate and methods for applying phosphatic fertilizer and soil P-fixation capacity are critical factors for lower cotton productivity in Southern Punjab, Pakistan.

Integrated deep banding and fertigation of phosphorus improves cotton

Applying 50 % of the P fertilizer as a band at a 15 cm depth before planting drip-irrigated cotton is optimal. This practice enhances soil P availability, stimulates root growth and distribution, and ultimately improves P utilization and cotton yield.

In agricultural production, cotton, as an important cash crop, relies on rational fertilization management to improve its yield and quality. Phosphate fertilizer is indispensable for cotton growth, playing a critical role in its development and productivity. Below is a detailed guide on the appropriate phosphate application rate per mu for cotton during the second irrigation, aiming to provide valuable insights for farmers.

I. Functions of Phosphate Fertilizer

1. Promotes Root Development: Phosphate fertilizer stimulates root growth, enhances root absorption capacity, and improves water and nutrient uptake efficiency in cotton.
2. Accelerates Bud Differentiation: Appropriate phosphate application advances cotton bud differentiation, hastening flowering and improving maturity and fiber quality.
3. Enhances Stress Resistance: Phosphate fertilizer boosts resistance to diseases, pests, drought, and other stresses, reducing pesticide use while increasing yield and quality.

II. Fertilizer Application Calculations

1. Soil Testing: Conduct soil tests before fertilization to assess phosphorus levels and cotton growth conditions. Use test results to determine optimal application rates.
2. Target Yield: Based on target yields, soil test data, and fertilizer efficiency, calculate required phosphate. Typically, 50–80 kg/mu of diammonium phosphate (DAP, 46% phosphorus content) is recommended.
3. Application Method: Evenly spread phosphate fertilizer between cotton rows to avoid direct root contact, preventing root burn. Combine with other fertilizers (e.g., nitrogen, potassium) for balanced nutrition.

III. Timing of Application

1. Base Fertilization: Apply phosphate as base fertilizer before planting to meet nutritional needs throughout the growth cycle.
2. Topdressing: During growth, topdress based on plant health and soil tests. Key periods include the stalking, flowering, and boll-forming stages.
3. Foliar Spraying: Apply foliar sprays (e.g., potassium dihydrogen phosphate) to enhance photosynthesis and stress resistance.

IV. Key Considerations

1. Avoid Overapplication: Excessive phosphate can lead to soil acidification, salinization, or toxicity. Stick to recommended rates.
2. Balanced Fertilization: Pair phosphate with nitrogen, potassium, and organic fertilizers to optimize nutrient uptake and reduce waste.
3. Safety Precautions: Wear protective gear during application and disinfect tools to prevent contamination.

Determining the optimal phosphate rate for cotton requires综合考虑 soil conditions, target yields, and growth stages. Scientific application improves yield and quality, but adjustments may be needed based on local practices. By following these guidelines, farmers can achieve efficient and sustainable cotton cultivation.

Note: "Mu" (亩) is a Chinese unit of area (≈0.067 hectares).