Orange, Virginia (1970) Yield was significantly improved.
South Africa (1989-90) Best yield was achieved with applications at first bud break.
Hebei, China (2011) Yield was increased 7.03% as compared with routine fertilization.
Java, Indonesia (2011-12) Yield increase of 7.57%.
Jilin, China (2011) Yield was increased by 8.3% as compared with application of mixed fertilizer containing no Zinc.
Tennessee, USA (2004) A significant increase in yield was found.
Tennessee, USA (1994) All 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) Increases yield by 8-20%.
Central Java, Indonesia (2012-13)
Punjab, India (2003-04) Significant yield increase over the control.
Norwich/Norfolk, United Kingdom (1990)
Shaanxi, China (2011) More green leaf color, healthier plant growth, and yield increase 2.6%.
Shandong, China (2011)