Liquid Monopotassium Phosphate Fertilizer (LBboost Liquid MKP) is a ready-to-use liquid P–K fertilizer with total nutrients (P₂O₅+K₂O) ≥750 g/L, comprising P₂O₅ 450 g/L and K₂O 300 g/L, enriched with betaine (≥4 g/L) as a functional component. Requiring no pre-dissolution, it is convenient for foliar spray, UAV application and fertigation, delivering concentrated nutrition and supporting crop performance under stress, suitable for vegetables, field crops, fruit trees and greenhouse production.