Zinc Foliar sprays Help..
Our Zi levels in our (01Feb-sampled) leaf samples have gradually fallen at ~ 5ppm per year from 30ppm in 2006 to 20ppm in 2008 so we have decided to act. We are keen to try foliar spray and intend to mix with mankocide (so no ‘spraying cost’) and spray in Nov or Dec.
The best guidance we currently have is http://walnutresearch.ucdavis.edu/1993/1993_196.pdf and this seems a little dated (1993).
Has anybody tried to elevate Zi levels with foliar sprays.. did it work (what product/rate etc)? Were there any ‘issues’.. phytotoxic effects?
Any data, information, knowledge or wisdom out there?
[message relayed here on behalf of Clive]