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Potassium Dihydrogen Phosphate (KH₂PO₄, also known as MKP, 0-52-34) is a fully water-soluble, chloride-free phosphate fertilizer that delivers both phosphorus (P) and potassium (K) in a highly bioavailable form. During the grain filling stage — the period between pollination and physiological maturity — crops such as wheat, corn, rice, and soybean undergo the most intensive nutrient demand of their lifecycle.
Phosphorus drives the synthesis and translocation of assimilates (sugars and starches) from leaves and stems into the developing grain. Potassium regulates stomatal aperture, enzyme activation, and phloem loading — directly controlling the rate at which photosynthates move into the grain. A foliar application of KH₂PO₄ at this stage provides a rapid, targeted supply of both elements, bypassing soil fixation and delivering nutrients exactly when and where the crop needs them most.
Scientific studies consistently show that foliar-applied KH₂PO₄ at grain filling increases 1,000-grain weight by 4–12%, accelerates starch synthase activity, improves sucrose-to-starch conversion efficiency, and enhances ABA signaling that promotes grain sink strength. The high solubility of MKP (≥99% purity) ensures rapid leaf absorption within 2–4 hours of application, making it ideal for time-sensitive reproductive-stage nutrition programs.
Additionally, the potassium component improves cell turgor pressure and membrane integrity under heat and drought stress — conditions that are increasingly common during grain filling in many global growing regions due to climate change.
A single well-timed foliar application of KH₂PO₄ (1.5–3 kg/ha in 15–30 L water via drone) during early to mid grain filling can increase grain yield by 5–15% and improve grain protein content by 0.3–0.8 percentage points — delivering measurable ROI for commercial grain producers worldwide.
Luobu's drone-grade MKP is engineered with ultra-low viscosity and near-zero insoluble content, ensuring nozzle integrity and uniform spray pattern at high concentration (≥200 g/L). Compatible with all major agricultural drone platforms including DJI Agras, XAG, and EAVISION systems.
📊 Typical Application Parameters
Concentration: 1.5–3% solution (150–300 g/100L)
Timing: Heading to early grain fill (GS71–GS75 for wheat)
Volume: 15–30 L/ha via drone; 200–400 L/ha ground spray
Frequency: 1–2 applications, 7–10 days apart
Compatibility: Mix with most fungicides & insecticides (jar test recommended)
≥99% purity MKP dissolves completely at room temperature with no residue, ensuring zero nozzle blockage in drone and pivot irrigation systems during critical grain filling windows.
The 0-52-34 nutrient ratio delivers the precise phosphorus-to-potassium balance required to maximize starch synthesis and assimilate translocation during grain development.
Completely free of chloride and sodium, making it safe for chloride-sensitive crops and suitable for use in high-value grain and specialty crop programs.
Certified for use in UAV spray systems with controlled particle size, low viscosity, and rapid dissolution — enabling precision application at the exact moment of grain filling onset.
Meets international food safety and fertilizer standards including ISO 9001:2015, China GB standards, and EU fertilizer regulation requirements for export markets.
Suitable for drip irrigation, sprinkler fertigation, foliar spray, and drone application — providing maximum flexibility for modern precision agriculture operations.
The global agricultural drone market is projected to reach USD 9.5 billion by 2030 (CAGR 31.4%). China alone operates over 200,000 registered agricultural drones, with grain-filling foliar nutrition representing the fastest-growing application segment. Drone-grade MKP demand has grown over 300% in China between 2020–2024, driven by labor shortages and precision agriculture mandates.
Southeast Asia (Vietnam, Thailand, Indonesia), South Asia (India, Bangladesh), and Latin America (Brazil, Argentina) are rapidly adopting water-soluble phosphate fertilizers for grain crop programs. Regulatory approval of drone spraying in these regions is accelerating MKP import demand, with China-origin KH₂PO₄ capturing significant market share due to competitive pricing and quality consistency.
Integration of satellite NDVI mapping, soil sensors, and AI-driven crop models is enabling variable-rate KH₂PO₄ application during grain filling — optimizing dose and timing based on real-time crop status. This "precision phosphate" approach is reducing input costs by 15–25% while maintaining or improving yield outcomes across major grain-producing regions.
Global food security pressures and environmental regulations are pushing growers toward high-efficiency, low-waste fertilizer solutions. KH₂PO₄ applied at grain filling delivers nutrients with minimal leaching risk compared to soil-applied phosphate, aligning with EU Farm-to-Fork targets, China's fertilizer reduction policy, and carbon footprint reduction goals of major grain trading companies.
Apply 1.5–2 kg/ha MKP solution at flag leaf to early dough stage. Trials show +8.3% 1,000-grain weight increase and improved gluten content in wheat.
Foliar KH₂PO₄ at heading and milky stage improves panicle weight, reduces unfilled grains by 12–18%, and enhances milling quality in indica and japonica varieties.
Post-bloom application drives cell division and early fruit sizing. KH₂PO₄ improves fruit sugar-acid ratio and reduces physiological fruit drop in stone fruits and citrus.
Used in fertigation programs for tomato, pepper, and leafy vegetables to enhance fruit set, improve Brix levels, and extend shelf life through improved potassium loading.
Drone-sprayed KH₂PO₄ at early grain fill stage, demonstrating measurable grain weight improvement and reduced shriveling under heat stress conditions.
UAV foliar application of MKP during rice heading and milky grain stage, improving panicle fill rate and reducing empty grain percentage significantly.
Post-bloom MKP application via drone enhancing fruit set percentage and early cell division in high-value fruit crops across multiple orchard trials.
Foliar and fertigation use of KH₂PO₄ in vegetable production systems, improving fruit quality parameters and extending marketable shelf life.
ABOUT US
Founded in 2019, Sichuan Luobu New Material Technology Co., Ltd. is located in Shifang City, Sichuan Province — one of China's key phosphate production regions. The area is known for its strong phosphate resource base and well-developed industrial infrastructure, providing a solid foundation for fertilizer manufacturing and technical innovation.
The company focuses on the research, production, and supply of high-performance phosphate-based fertilizers for modern agriculture. As a council member of the China Agricultural Technology Extension and Service Association and the China Phosphate & Compound Fertilizer Industry Association, Luobu is at the forefront of drone-grade MKP innovation and grain filling nutrition solutions.
As a specialized manufacturer of drone-grade MKP and water-soluble fertilizers for grain filling stage applications, we actively participate in industry development as a council member of the China Agricultural Technology Extension and Service Association and the China Phosphate & Compound Fertilizer Industry Association.
