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Old 08-01-2013, 10:12 PM
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RigglePLC RigglePLC is online now
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Iron on grass and crabgrass

I tested iron sulfate as an iron supplement for turfgrass using about 6 ounces per half-gallon of water, which covered abut 1000 sqft.

Iron applied to green grass (bluegrass plus fine fescue in light shade), caused very slight darkening of the color. Even when sprayed 8 times over, there was only a slight visible darkening effect. Dandelion appeared to be injured. There was no injury to the grass.

When the solution was applied 6 times over as a 30 inch stripe to crabgrass, near a road, a distinct darkening of the color was visible 8 hours later, probably due to some black staining. After 48 hours some of the crabgrass appeared to be injured or dead.
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Old 08-01-2013, 10:43 PM
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foreplease foreplease is offline
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I have to take 325-650 mg Ferrous sulfate daily. Wonder what equivalency is for turf.

I used to get great same day results spraying iron on bentgrass. Somewhere I have a good photo of an area I covered to show the difference where no iron was applied at 4 hours. Interesting what you are seeing on weeds.
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Old 08-02-2013, 01:14 AM
greendoctor greendoctor is online now
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That explains what happens when I use ferrous sulfate in the fertilizer mixes instead of the chelated micronutrient blends. My usual rate is up to 16 oz per 1000 in 5 gallons. Many weeds are scorched. This is on bermuda, St Augustine, or zoysia. One note, if the grass was rotary mowed, weed whacked, or the reel was dull/out of adjustment, there is an obvious burning and discoloration on the damaged ends of the grass. If someone else does the mowing and trimming, I do well to wait at least a day before spraying.
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Old 08-02-2013, 10:36 AM
Smallaxe Smallaxe is offline
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It makes sense that iron deficient lawns would show a color change,,, but what I find most interesting is the effect that it MAY HAVE on crabgrass... if the CG is actually killed, that would be good news to me...
Riggle,,, keep us posted...
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Old 08-02-2013, 11:09 AM
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I think this is more of a black iron stain--not correcting any deficiency. I will try to get another picture--close up of the crabgrass. I wonder what would happen if you combined iron with Drive--or one after the other.
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Old 08-02-2013, 01:47 PM
Smallaxe Smallaxe is offline
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Quote:
Originally Posted by RigglePLC View Post
... I will try to get another picture--close up of the crabgrass. I wonder what would happen if you combined iron with Drive--or one after the other.
That is what I'm curious about... I could use a cheap easy way to dispose of the CG now as opposed to waiting for frost... Especially in light of the new information about CG having allelopathic chemicals that attack other plants but the soil microbes as well... it may be difficult to renovate some of the CG patches if I wait until frost...
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Now that I know that clay's texture(platelets) has nothing to do with water infiltration, percolation, or drainage
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Old 08-02-2013, 03:16 PM
turfmd101 turfmd101 is offline
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The heavy iron sulfate just dehydrates the crabgrass. A temporary stress to the crabgrass. Iron sulfate is a very heavy element. It is simply a byproduct of the iron industry.
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Old 08-03-2013, 01:34 PM
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Iron and crabgrass.

I applied iron to crabgrass at about 6 ounces iron sulfate per gallon. I applied it at a high rate --about 6 times over--to crabgrass near the road in a stripe about 3 feet by 8 feet. The crabgrass turned much darker green in 24 hours, and then almost black, and was severely injured--some of it killed. See photo: leaf was included for contrast (basswood, I think.)

A few yards away, I sprayed Drive 75 WP in a strip about 2 feet by 15 feet. Drive was effective. Crabgrass was mostly brown and dead. Unsprayed crabgrass at right in the photo. Photo was taken at 4 days after treatment. Soil was fairly moist from recent showers and temperature highs were about 82.
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Old 08-03-2013, 05:23 PM
newguy123 newguy123 is offline
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Old 08-03-2013, 07:44 PM
NAT NAT is offline
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I think the new organic weed controls are iron based
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