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The objectives of the research is to determine optimum liquid fertilizing on red spinach cultivation in a greenhouse. The research was conducted from March to April 2019 at the SprayerLaboratory and in a greenhouse to determine parameters of droplet diameter, droplet density, effective spraying width, effective spraying debit, and harvested biomass weight. Spraying tools and material are SWAN F16 electric sprayer, air blower, and liquid fertilizer. Results of the research showed that the use of the electric sprayer and the use of the electric sprayer and the air blower produced minimum droplet diameter, maximum droplet density, maximum effective spraying width, and minimum effective spraying debit were 311 micron m, 706 droplet/cm2, 56 cm, and 1.99 liter/minute and 405.14 micron m, 361 droplet/cm2, 72 cm, and 2.21 liter/minute in average respectively. The use of the electric sprayer has produced maximum harvested biomass weight of 7.17 g/plant in average on walking speed of 0.9 m/s with 1.97 liter/ha liquid fertilizer dosage. The use of the electric sprayer and the air blower have produced maximum harvested biomass weight of 4.55 g/plant in average on walking speed of 0.5 m/s with 3 liter/ha liquid fertilizer dosage.