Posted 11/17/2012 22:34 (#2703104 - in reply to #2702529) Subject: Re: Orthophosphate or Polyphosphate
Manitoba
Most of the studies I've seen where ortho wins the trial are all done on light land where the higher salt index of the 10-34 has hurt plant pop. We have done trials on our farm and alpine and black label zinc have not beat 10-34 and are twice as expensive for what you get. With that said on a dry spring you have to be carefully using 10-34.