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Watermelon fertilizer: the economic benefits of foliar nutrition

A field trial conducted in Vietnam confirmed: spraying Poly-Feed™ and Haifa MKP™ on the leaves results in higher yield and profit

The field trial tested the farmer's practice – a base fertilizer program – against Haifa's treatment: the farmer's watermelon fertilizer practice + Poly-Feed™ and Haifa MKP™ foliar sprays.  The results, as shown in the table and graphs below, were in favor of Haifa's treatment – there is higher profit per Ha and higher yield.


Country / locationVietnam / Can Tho province
Trial typeOpen field
SeasonsDry and Rainy season, 2012
Area2 ha (1 ha/season)
Haifa products testedHaifa MKPTM, Poly-FeedTM 15-30-15, Poly-FeedTM 16-8-34
Application methodFoliar nutrition
Variety propertiesName: TN 755
Growth time: 55-60 days
Fruit weight: 4-5 kg
Average Yield: 30-40 tons/ha
Tested treatmentsControl (farmer practice): Base fertilizer program: 125N - 100P2O5 - 120K2O + 40CaO
Haifa treatment: Farmer practice +
Poly-FeedTM 15-30-15+TE (50grams/16 lits water, 320 lits/ha) spray 2 times after planted 13 days and 18 days;
Haifa MKPTM (100grams/16 lits water, 320 lits/ha) spray one time before flower setting 5-7 day;
Poly-FeedTM 16-8-34+TE (50grams/16 lits water, 320 lits/ha) spray 3 times after fruit setting and 5 days apart
Control treatment resultsFarmer practice: Dry season: 22.6 t/Ha
Rainy season: 18.5 t/Ha
Best treatment resultsFarmer practice + Haifa foliar: Dry season: 24.8 t/Ha
Rainy season: 19.9 t/Ha
Cost of best treatment20 USD
Net benefit of best treatmentNet profit difference : Dry season:639 USD/Ha
Rainy season: 578 USD/Ha
Benefit/cost ratio of Haifa treatmentDry season: 31.95
Rainy season: 28.90*
ConclusionsThe extra cost of the foliar treatment (20 USD/ha) gave higher profit per Ha (578-639 USD/ha). The foliar treatment cost/benefit ratio was higher in the dry season, when yields are usually low due to less than optimal growing conditions
ReferenceMSc. HUYNH TRI CUONG, Agronomic Director
* Although the fertilizer costs were higher, the total cost for each season was lower, due to lower pests infection in the foliar nutrition treatments, resulting in less pesticides use.
Watermelon fertilizer - Sunny season, Can Tho plot
Watermelon fertilizer - Rainy season, Can Tho plot