Variable rate liquid N

[Oscar]

I contract apply over 1000tonne of product , the vast amount by variable rate. However , on 36m boom, it's the whole 36m which changes rate. Is anybody using a system where the rate can change along the boom ? I am wondering if pulse width modulation and fertilizer nozzles rather than bars could do such a thing?
Also be interested to hear if the nozzle switching on a Horsch can deal with this ? Only one I know on here is @Tom H or @Clive . Thanks.

 

[Clive]

We did N1 on OSR this week which is the first time we have applied VRA liquid N with the Horsch after years of Bateman doing VRA with BFS bars

Using Hardi qunitastreams on the Horsch as the BFS accurate don't work with the way pressure and flow based sensing in the Leab or fit with the booms so well

No problem at all, the system was switching really nicely between nozzles or running multiple nozzels at a time to keep pressure below 2 bar from as low as 4k right up to 18kph if I recall correctly (I'm not the driver !) and dealing with the VRA plans absolutely no problem, on this application we were running +/- 80L /ha

Lovely pattern from the Hardi's ................ and that boom stability, i'm still gob smacked every-time I see it, it's on a completely different level to anything I've seen before

rate change is of course the entire 36m though - you would have to go to a pulse system like the Raven to get higher resolution, I looked at these systems and I think Chafer and Bateman have now done machines equipped with it, its looks very good but its VERY expensive and I was concerned about being such an early adopter on a machine as time critical as a sprayer ......................so chickened out basically !

 

[Oscar]

Thanks for reply. Got new machine coming in June and looking at all possibilities.

 

[Brisel]

Pulse width modulation is your best option. I don't see why it shouldn't work with dribble bars.

 

[Oscar]

Thanks, looking to see if it's possible. Will report back !!

 

[Nametab]

We did N1 on OSR this week which is the first time we have applied VRA liquid N with the Horsch after years of Bateman doing VRA with BFS bars

Using Hardi qunitastreams on the Horsch as the BFS accurate don't work with the way pressure and flow based sensing in the Leab or fit with the booms so well

No problem at all, the system was switching really nicely between nozzles or running multiple nozzels at a time to keep pressure below 2 bar from as low as 4k right up to 18kph if I recall correctly (I'm not the driver !) and dealing with the VRA plans absolutely no problem, on this application we were running +/- 80L /ha

Lovely pattern from the Hardi's ................ and that boom stability, i'm still gob smacked every-time I see it, it's on a completely different level to anything I've seen before

rate change is of course the entire 36m though - you would have to go to a pulse system like the Raven to get higher resolution, I looked at these systems and I think Chafer and Bateman have now done machines equipped with it, its looks very good but its VERY expensive and I was concerned about being such an early adopter on a machine as time critical as a sprayer ......................so chickened out basically !

Capstan PWM has been out 20 years, so you certainly would not be an early adopter.