I have never sprayed much with a boom sprayer, but this spring I am spraying 15 acres of clearfield sunflowers so I am going to spray a tank mix of Spartan 4f, Dual Magnum, and Roundup as a tank mix pre-emergent. I will also be spraying a post-emergent of beyond. My question is when buying new nozzles there is a chart on the back of the package that say so many gallons per acre at certain speed. Is that for the whole boom or single nozzle? example it says 12 gallons per acre that is alot of spray from one nozzle. If you had 8 nozzles that is 96 gallons per acre which is way to much!! I am thinking if you had one nozzle it would take a long time to cover one acre so you would get 12 gallons out of that one nozzle, but with 8 nozzles it would take 1/8 of the time so you would still get 12 gallons per acre because it took 1/8 of the time to cover a acre compared to just one nozzle is that right? So really no matter how many nozzles you would still get the same gallons per acre because you are dividing the time it took to cover the acre. This is with a 20" nozzle spacing.
- Thread starter IH26
- Start date
Bob Bancroft
Well-known Member
- Location
- Aurora NY
Sounds like you're headed in the right direction. Keep in mind when they rate nozzles they have no idea how many you have. So, yes, it doesn't matter if you cover the acre with one nozzle many times, or a bunch of nozzles lined up together. Nozzles will have a pressure rating also. My experience is that if you're close on pressure you should be OK. Speed is critical. Your best friend there is a little GPS giving you exact ground speed.
Bob Bancroft
Well-known Member
- Location
- Aurora NY
I should have added- I assume you're using water as the carrier. Other liquids will come out at a different rate. There are charts for those calculations. Your tank mix can make a difference too. Sounds like you've got quite a mixture there that I'm not familiar with. Are they compatible?
I was told once that if you come out within 10% of your goal, you did good!
I was told once that if you come out within 10% of your goal, you did good!
Thank you for the advice I just wanted to make sure I was thinking right on the rate per acre, I have a Kubota 9540 cab tractor so it has digital mile per hour/pto speed. The pressure is also on the package. I am going to build a po-boy foam marker system for my sprayer as well so I can see where I sprayed.
Bob Bancroft
Well-known Member
- Location
- Aurora NY
I know nothing about that tractor, but I assume it has neither radar nor GPS. Be aware that those meters can be off. Being digital it may have the capability of being calibrated to your tire size. I would check it against a GPS before heading to the field.
I'm no math major or anything so I keep it real simple for me. I have a acre measured out and usually when I make a change on my sprayer I'll do a test run. Set the speed and rpm at what I will be spraying at. Then may even use water only and see how much water out of the tank I use, then go from there. My small rig will normally use anywhere from 20-25 gallons per acre to cover it. If the product calls for a pint per acer I mix a pint to however many gallons I'm applying per acre.
casecollectorsc
Well-known Member
- Location
- E central SD.
10 gallons per acre is just that. It will take 100 gallons of spray to cover 10 acres. Each nozzle has a number on it, which with the manufactures calibration chart will tell which nozzle to use at 30# pressure and 5mph. to get 10 gallons per acre.
Don't know if you have a Spray License but you may need one to buy the chemicals. Also don't use over 30psi when spraying. That helps keep down drift something that's very important when spraying roundup. Will you be spraying close to houses or living quarters where drift may be a problem?
Getting back to nozzle/gpa. One nozzle at 12gpa Gallon Per Acre is the normal. Divide 12 gallons over 43,560 sq. ft. and that's how many ounces you'll spread on each square foot in each acre so 12 gpa is not a lot of product thru that nozzle.
Getting back to nozzle/gpa. One nozzle at 12gpa Gallon Per Acre is the normal. Divide 12 gallons over 43,560 sq. ft. and that's how many ounces you'll spread on each square foot in each acre so 12 gpa is not a lot of product thru that nozzle.
I live in TN and my local co-op has never asked to about a license. I want to spray 12 gallons over the acre with the entire boom not just one nozzle. My thinking if the chart says one nozzle sprays 12 gallons per acre well if I divided that by 8 or how ever many of nozzles you have on your boom it is still going to be 12 gallons per acre because you covered the acre 8 times faster than if you just had one nozzle. So if you had two knozzles you covered the acre twice as fast as one nozzle. If you have 4 you covered the acre four times faster and so on. So no matter how many nozzles you have you are still going to get the same 12 gallons per acre. The more nozzles you have the less amount of product you spray per nozzle per acre, but you have more nozzles which intern cancel each other out to recieve the same 12 gallons no matter how many nozzles you have. Am I thinking right or am I on the wrong track?
Anonymous-0
Well-known Member
Best thing to do is to calibrate the boom, with a given set of nozzles.
Step 1. Fill tank all the way up with water.
2. drive in the gear you likely will be using in the field, for a set # of minutes, or a set distance. If it's a Hydro tractor, you will need a speed indicator, like a cal-can acre calculator.
3. Re fill the tank, measuring the amount it takes to fill back up.
4. Measure the distance travelled, and the width of the effective spray pattern.
To make the math easy, let's say you travelled 100 feet, your width was 10 feet, and you used 10 gallons.
You sprayed 10,000 square feet, at a rate of 1 gallon, per thousand square feet.
Doing the math, you sprayed .2295 Acre, at a rate of 43.56 gallons per Acre, if I did the math right.
By setting it up this way, you get rid of the theory, of what the nozzle package, pump package, and pressure loss theories SAY, and end up with what you actually did. It is a small step, then to change one variable (IE, speed or nozzle size), and dial in the amount of spray that the directions on the label of the pesticide, tells you to use.
Step 1. Fill tank all the way up with water.
2. drive in the gear you likely will be using in the field, for a set # of minutes, or a set distance. If it's a Hydro tractor, you will need a speed indicator, like a cal-can acre calculator.
3. Re fill the tank, measuring the amount it takes to fill back up.
4. Measure the distance travelled, and the width of the effective spray pattern.
To make the math easy, let's say you travelled 100 feet, your width was 10 feet, and you used 10 gallons.
You sprayed 10,000 square feet, at a rate of 1 gallon, per thousand square feet.
Doing the math, you sprayed .2295 Acre, at a rate of 43.56 gallons per Acre, if I did the math right.
By setting it up this way, you get rid of the theory, of what the nozzle package, pump package, and pressure loss theories SAY, and end up with what you actually did. It is a small step, then to change one variable (IE, speed or nozzle size), and dial in the amount of spray that the directions on the label of the pesticide, tells you to use.
Anonymous-0
Well-known Member
you're not considering pressure in your calculations. pressure will be maintained with one nozzle or 10 nozzles.
Anonymous-0
Well-known Member
Yep, most of the time I can say it better'n write it. At least I understand me, LOL!
Pressure needs to be maintained for nozzle size. The more nozzles added will drop your pressure so you'll have to run your pump faster to make up the difference. The more nozzles equals more volume/product going thru your pump in a given time. So the pump will have to run at a speed to maintain the given pressure. Just consider each nozzle a leak in the system.
One other way is to buy a raven spray monitor it will maintain pressure and gpa at almost any speed and count your acres plus many other features it does.
One other way is to buy a raven spray monitor it will maintain pressure and gpa at almost any speed and count your acres plus many other features it does.
IH26 you are over thinking this. The rating on the back of the package is for the flow of that nozzle at the correct spacing that the chart shows. So to get one nozzle to apply the 12 gallons you would have to cover the entire acre of ground with just that one nozzle.
So if you have a boom with 20 nozzles at the 20 inch spacing then they will apply the liquid at the rate of 12 gallon per acre. You would just have fewer passes.
You have it figured out correctly in that more nozzles just gives you fewer passes. You do not divide the rate by the nozzles used.
So if you have a boom with 20 nozzles at the 20 inch spacing then they will apply the liquid at the rate of 12 gallon per acre. You would just have fewer passes.
You have it figured out correctly in that more nozzles just gives you fewer passes. You do not divide the rate by the nozzles used.
Similar threads
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.
Copyright © 1997-2024 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy