2.1 Key FeaturesHigh Concentration: Contains a very high percentage of P₂O₅ (34%) and K₂O (52%), making it one of the most concentrated PK fertilizers available.
Excellent Solubility: Dissolves completely and rapidly in water, leaving no residue, which is essential for drip irrigation systems to prevent clogging.
Chloride-Free (Cl⁻): Does not contain chloride ions, making it safe for use on chloride-sensitive crops like tobacco, potatoes, grapes, and berries.
Low Electrical Conductivity (EC): Has a relatively low salt index, minimizing the risk of root damage and soil salinity stress, especially in protected cultivation.
Acidic Nature: Helps to slightly acidify the rhizosphere (root zone), which improves the availability of phosphorus and micronutrients (like iron and manganese) in neutral to alkaline soils.
Synergistic Effect: The high potassium content enhances the mobility and utilization of phosphorus within the plant.
2.2 Primary Functions and Benefits
| Function | Benefit to Plants | Agronomic Advantage |
| Phosphorus Supply | Critical for energy transfer (ATP), root development, flowering, and seed formation. | Promotes vigorous root growth, uniform flowering, and improves fruit set percentage. |
| Potassium Supply | Regulates water relations, enzyme activation, sugar and starch transport, and protein synthesis. | Enhances fruit size, weight, and firmness; improves sugar content, color development, and overall fruit quality; increases drought and disease resistance. |
| Fruit Development | Provides the essential "energy" (P) and "quality" (K) elements during fruit bulking. | Directly increases yield and marketable quality of fruits, vegetables, and tubers. |
| Stress Resistance | Potassium strengthens cell walls and regulates stomatal opening. | Improves crop tolerance to drought, frost, and certain fungal diseases. |
2.3 Target Crops and Application Scenarios
Fruit Trees: Citrus, grapes, apples, peaches, mangoes - Applied during fruit enlargement and coloring stages to increase brix (sugar content) and improve fruit appearance.
Vegetables: Tomatoes, peppers, cucumbers, melons - Used during flowering and fruiting periods to prevent blossom-end rot (by improving Ca mobility) and enhance fruit quality.
Cash Crops: Tobacco, potatoes, sugar beets, cotton - Essential for tobacco leaf quality, potato tuber size and dry matter content, and sugar beet root yield.
Flowers and Ornamentals: Promotes vibrant flower color and strong stems.
Application Timing: Most beneficial during the reproductive growth stage (from flowering to harvest). It is often used as a "fruit-swelling fertilizer" or "color-enhancing fertilizer."
2.4 Application Guidelines (General)
Fertigation (Recommended):
Dilution: Dissolve 5-10 kg of MKPO52-34 in 1000 liters of water.
Application Rate: Apply 5-15 kg per hectare per application. The frequency can be adjusted to 1-2 times per week during peak demand periods.
Foliar Spray:
Dilution: Dissolve 2-3 kg in 1000 liters of water.
Spray: Apply evenly on leaves, especially during the early stages of fruit development and color change. Avoid spraying under strong sunlight.
Precautions:
1.Do not mix with calcium-containing fertilizers (e.g., calcium nitrate) in high concentrations, as it may cause precipitation. If needed, use a compatibility test or apply separately.
2.Always conduct a soil test to determine the precise nutrient requirement. Over-application of phosphorus can lead to fixation in the soil and potential environmental issues.
Note: MKPO52-34 is essentially a specific grade or brand name for a fertilizer with a composition very similar to Monopotassium Phosphate (MKP), but with a slightly adjusted ratio favoring potassium. It is designed for situations where a higher potassium-to-phosphorus ratio is desired.