# Equations for AI in combo products

Discussion in 'Pesticide & Herbicide Application' started by Shades of Green LService, Feb 19, 2007.

1. ### Shades of Green LServiceLawnSite Bronze Memberfrom New JerseyMessages: 1,011

Whats the easiest equation for figuring out ai p/K in combo products??

2. ### lilmarvin4064LawnSite Senior Memberfrom transition-zoneMessages: 757

no problem,

let's take Dimension 0.10% 19-0-6 for example,

The desired ai/A (active ingredient per Acre) for my area is 0.38 lbs. ai/A.

To do equal, split apps, you need 2 rounds at 4.35#.

app rate x Acre x concentration

4.35 x 43.56 x .001 = 0.19 ai/A

2 apps is 0.19 + 0.19 = 0.38

Abbreviations

ar = application rate
A = Acre
c = concentration of active ingredient in bag (0.21% = 0.0021)
ai/A = desired active ingredient per Acre

Formula....

ar = (ai/A) / (A x c)

example...
for Dimension 0.21% 18-0-10

ar = (0.38) / (43.56 x 0.0021) = 4.15 lbs.

3. ### Shades of Green LServiceLawnSite Bronze Memberfrom New JerseyMessages: 1,011

thanks, looks good. bare with me for a minute if you will.I want to keep my records crystal this year, you understand. heres the product i'm trying to figure:
16-0-28 .43% AI
max ai per year per acre is 1lb at a rate of 5.34 lbs per /K
how would i figure out the AI per thousand. What do you think?

4. ### ampeg76LawnSite Senior Memberfrom Houston,TxMessages: 297

pardon my hijack

when doing split applications using dimension, what are the benefits?

does this diminish the effects on the N-P-K side of things going with two half rate applications?

thx
mike

5. ### Shades of Green LServiceLawnSite Bronze Memberfrom New JerseyMessages: 1,011

never mind, got it thanks.

6. ### teecaLawnSite Bronze Memberfrom Indianapolis, InMessages: 1,202

i use liquid apps, so nothing is effected by way of N-P-K. also here in the north, the N-P-K in the spring isn't that big of a deal, the pre-m is. as far as split apps, the coverage is extened into the summer months, long after the effects of a single app is over (split apps realy help when you have a rainy summer, when the 1 app program leaches out)

thanks
mike

8. ### ATVracerLawnSite Senior Memberfrom IndianaMessages: 346

Purdue's turfgrass site has a new link that came out yesterday with the formula. It is under turf tips.