Orange, Virginia (1971): Yield was significantly improved
South Africa (1989-1990): Best yield was achieved with applications at first bud break
Hebei, China (2011): Yield increase of 7.03% as compared with routine fertilization
Java, Indonesia (2011-2012): Yield increase of 7.57%
Jilin, China (2011): Yield increase of 8.3% as compared with application of mixed fertilizer containing no zinc
Tennessee, USA (2004): Significant increase in yield
Tennessee, USA (1994): Treatments increased yield over the control
East Java, Indonesia (2013): Savings in fertilizer cost and rapid leaf growth compared to previous year
West Java, Indonesia (2011): Yield increase of 8-20%
Mekong Delta, Vietnam (2018-2019): Average yield increase of 10%
Punjab, India (2003-2004): Significant yield increase over the control
Mato Grosso do Sul, Brazil (2017 - 2019)