Analysis of The Effect of Mono Potassium Phosphate Fertilizer and Amino Acid Liquid Organic Fertilizer on The Quality of Melon Fruit (Cucumis melo L.)
Abstract
Melon is a highly valuable horticultural commodity, and improving its fruit quality is essential for enhancing
market competitiveness. The application of mono potassium phosphate fertilizer and liquid organic fertilizer (LOF)
enriched with amino acids is expected to play a significant role in optimizing melon quality. This study aims to
evaluate the effects of different dosages of mono potassium phosphate fertilizer and amino acid-enriched LOF on
the quality attributes of melon fruit. The research was conducted from April to July 2024 in a greenhouse located
on agricultural land in Jatirejo Village, Nganjuk Regency. A total of 144 plants were used as research samples,
arranged into 12 treatment combinations with three replications, with four plants per plot. The first treatment
factor was the dosage of mono potassium phosphate fertilizer, with three levels: 5 g/plant, 10 g/plant, and 15
g/plant. The second factor was the dosage of amino acid-enriched LOF, which included four levels: control, 50
ml/plant, 100 ml/plant, and 150 ml/plant. Observed parameters included leaf number, fruit weight, flesh
thickness, sweetness level, seed count, water content, and vitamin C content. The interaction between mono
potassium phosphate fertilizer and amino acid-enriched LOF had a highly significant effect on fruit weight, flesh
thickness, and seed count. Additionally, the interaction had a significant effect on leaf number and fruit
sweetness. The combination of 15 g of mono potassium phosphate fertilizer and 100 ml of amino acid LOF per
plant resulted in the highest fruit weight and optimal sweetness. This study highlights a novel integrative
approach that combines inorganic phosphorus–potassium fertilization with amino acid–rich organic inputs to
enhance melon fruit quality more effectively than single-factor applications. Based on these findings, it is
recommended that melon growers apply 15 g of mono potassium phosphate, combined with 100 ml of amino acid
LOF, per plant to achieve superior fruit quality, particularly in terms of sweetness and overall yield.
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