If you have an issue with timeliness better boom control will increase the number of spraying opportunities. That could increase returns if it improves timeliness?Was it horstine ? That used to make a lot of their sprayers on 25cm years ago
Does all this expense give better yields or is it down to weather at the end of the day
The main reason is the nozzle size required when spraying at 25cm spacing. If spraying at say 100l/ha then you need a stupidly small nozzle, resulting in more drift and blockages. Running anything much smaller that 02’s becomes a pain. So to get something like sensible pressure you would be putting on 150l/ha at 25cm spacing even with 02’s. Don’t forget it’s not just 80 degree angle at 30cm boom height, you are doubling your water volume by having twice as many nozzles per boom section. I find the 25cm option is best when good coverage is required in windy conditions, alternate facing guardian airs putting on 100l/ha each, so 200l/ha actual rate. Rest of the time 100l/ha or less at 50cm spacing or 120l/ha with 03’s, other nozzles are quintastreams.I agree - we use 25 spacing at 50cm height with AI jets and results are great. A “true” 50cm height that a leab can achieve is different to what some think 50cm looks like !
In theory however they should be even better at 30cm height and 25cm spacing surely ?
The sprayer can do 30cm so can’t think of a reason not to now 80deg AI jets are an option ?
The main reason is the nozzle size required when spraying at 25cm spacing. If spraying at say 100l/ha then you need a stupidly small nozzle, resulting in more drift and blockages. Running anything much smaller that 02’s becomes a pain. So to get something like sensible pressure you would be putting on 150l/ha at 25cm spacing even with 02’s. Don’t forget it’s not just 80 degree angle at 30cm boom height, you are doubling your water volume by having twice as many nozzles per boom section. I find the 25cm option is best when good coverage is required in windy conditions, alternate facing guardian airs putting on 100l/ha each, so 200l/ha actual rate. Rest of the time 100l/ha or less at 50cm spacing or 120l/ha with 03’s, other nozzles are quintastreams.
I read recently , on either here or twittter or FB that someone was using alternate nozzles along the boom of a twin nozzle then a straight down then a twin etc. or did I dream it? did you comment on it @Clive ? Sounded an interesting combo of nozzles just wondered how itt worked on pre ems?
The important thing with the Horsch is to flush the booms everyday and blow out the lines, with such complicated boom plumbing, depending on spec, ours is 4 + 1, so 10 chemsavers per m, they can become problematic with build up of CTL etc. The worst ones are on the centre section. What helps is to take all nozzles off once/twice a season and flush out each complete section one at a time at max pressure. On a more standard boom you may only have two chemsavers per m which are in regular use, so no problem. Have heard when you go below 02's much more of a problem.
Sorry what I meant was that true 50cm as achievable all day long on a Horsch is as good as it gets, lowering to 30 cm doesn't achieve much, what does is using finer nozzles at 25cm spacing at 50cm boom height, double coverage.
Use Guardian lilac 025's at 25cm for some herbicides and all ear wash, angled forward backwards alternatively, coverage is excellent at 200l/ha. Though high water volumes for these specific applications no need to go to 80 degrees. True 50cm boom height is good enough, if too windy then shouldn't be spraying at 30 cm.
You must crawl along with 025 at 200lt
This thread has migrated to a very interesting subject and deserves its own thread really. I stumbled on it by accident.
25cm spacing dictates you should not use 110 degree nozzles which achieve a double overlap at 50 cm spacing and 50 cm boom height. An 80 degree nozzle at 50 cm spacing would need to be run at a 60cm boom height for double overlap. So for 25cm nozzle spacing to get double overlap at a 30cm boom height you have to use an 80 degree nozzle. Yes?
Or am I just very confused?
Some on here saying they use 110 degree nozzles at 25cm spacing and 30cm boom height - surely that will lead to uneven application of pesticides ?
Anyone remember their geometry lessons ?
You must crawl along with 025 at 200lt
Wouldn’t have thought to as an 025 at 25cm is the equivalent of an 05 at 50cm so would still have very decent forward speed.
Anyone know if I put a higher number in the box marked d whether this means the booms switch off slower or quicker as one heads into a headland. Think I may have it the wrong way round and the German translation isn't great.
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