Abstract
The objective 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 Sprayer Laboratory 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 meter, 706 droplet cm−2, 56 cm, and 1.99 litre min−1 and 405.14-micron meter, 361 droplet cm−2, 72 cm, and 2.21 litre min−1 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 litre ha−1 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−1 with 3 litre ha−1 liquid fertilizer dosage.
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