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Haifa Bonus improved nutritional status of apple orchard in Korea

Haifa Bonus improved nutritional status of apple orchard in Korea

Yield increase was attributed to better fruit retention and larger fruit size


Apple / Yangkwang

Country / locationKorea / Kyungbuk (Youngju) / Summer 2004
ObjectivesImprove fruit quality and nutritional status of the Orchard
Haifa product testedHaifa Bonus 13-2-44
Application methodFoliar nutrition
Tested treatmentOne foliar spray @ 0.5%, 1,200lit./ha in mid-May 
Two foliar sprays @ 1%, 1,500lit./ha in mid-June & early July
Two foliar sprays @ 1%, 1,500lit./ha at end-August & mid-Sep
Control treatment resultsTotal yield Kg/ha- 24800
% of marketable fruit – 88
Mean fruit weight – 280
Sugar Content (Brixo) - 12.8
Best treatment resultsTotal yield Kg/ha- 25500
% of marketable fruit – 91
Mean fruit weight – 295
Sugar Content (Brixo) – 13.5
Net benefit of best treatment4,860 US$/ha
Benefit/Cost ratio13.4
ConclusionsYield increase can be attributed to enhanced fruit retention force that reduced fruit drop by severe winds (typhoons).
Also, picking labor was reduced because less selective picking cycles had to be done, because a larger share of the fruits became large enough to be picked earlier in the season, and then again less fruit was exposed to the severe winds.
Tree condition improved and leaves’ browning symptom reduced.
Fruit-drop decreased during monsoon season.
ReferenceGil-Hong Ko, Haifa-Korea


Need more information about how to grow apple tree? You can always return to the apple tree fertilizer & tomato crop guide table of contents