Orange, Virginia (1971): Yield was significantly improved
Wisconsin (2020-2021): Granubor showed a better performance than the control at all rates even though not statistically different.
South Africa (1989-1990): Best yield was achieved with applications at first bud break
Paraná, Brazil (2020-2021): Application of 3 kg Granubor gave the highest barley grain yield compared to the control and acidulated ulexite.
Minas Gerais, Brazil (2016-2017): Highest yield
São Paulo, Brazil (2013-2015): Consistent yield increase
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
Kentucky, USA (2020): Granubor shows a better performance than the control.
Mississippi, USA (2021): Granubor shows a better performance than the control and ulexite.
Paraná, Brazil (2015-2016): One year study of Granubor