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Old 08-20-2013, 02:09 PM
Nullqwerty Nullqwerty is offline
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How Long To Wait After Fertilizer Application?

Hey folks,

I've been trying to research the safety of fertilizer application and children playing in a treated lawn. Harder than I thought.

I know I can use organic fertilizer if I wanted to be ultra-safe. But lets put that aside. Assuming I'm using normal non-organic fertilizer, is there a general consensus as to how long after an application it becomes safe for children to play in the grass? Is it considered safe again after 24 hours or 48 hours or 1 week? Or is the idea that a lawn regularly/scheduled treated is never safe for children to regularly play in?

I am fine with saying to my kids "Don't play on the grass for the next 2 days" and am very confident it won't be a problem. It is a problem if I say though "The grass is never safe to play in kids". In that case, I'll go organic.

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Old 08-20-2013, 02:52 PM
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FdLLawnMan FdLLawnMan is online now
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There is no restriction as to when people can enter an area treated with straight fertilizer. You are talking about nitrogen, phosphorous and potash. What is unsafe about those materials. Personally I think they are safer than dried human or cow waste.
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Old 08-20-2013, 03:29 PM
greendoctor greendoctor is offline
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I remember a daycare center specifically prohibiting "organic" fertilizers because of the possible pathogens and parasites present. Fertilizer watered in is not harmful to children or pets once the irrigation is dry. Chemical N, P and K is no more harmful than table salt. People do swim in the ocean, right?
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Old 08-20-2013, 05:10 PM
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phasthound phasthound is online now
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If the fertilizer contains pesticides, the label will provide the time of safe re-entry. For instance;

Precautions And Restrictions:
Do not apply this product in a way that will contact any person or pet, either directly or through drift. Keep people and pets out
of the area during application. Do not allow people or pets to enter the treated area until dusts have settled.
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Old 08-20-2013, 05:49 PM
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americanlawn americanlawn is offline
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thanks greendoctor

Quote:
Originally Posted by greendoctor View Post
I remember a daycare center specifically prohibiting "organic" fertilizers because of the possible pathogens and parasites present. Fertilizer watered in is not harmful to children or pets once the irrigation is dry. Chemical N, P and K is no more harmful than table salt. People do swim in the ocean, right?
Organic... a general term. Natural? Synthetic organic? How synthetic? Any more, most companies that sell "natural" organic fertilizer synthetically modify their products.

"Natural" organic fert can contain dangerous pathogens, contaminants and hazardous dust particles.

Manure runoff often causes many lakes & rivers "off limits" for swimmers.

We stopped offering "natural fertilizers" some years back because we were concerned about health issues. We prefer to use professional products designed to be used in the green industry. Too many folks have children, grandchildren, dogs, cats, etc. Customers also prefer non smelling products.

We offered natural organic fert on a trial basis. Now we use clean products that work, don't smell, don't contaminate, and homeowners can walk on their lawn immediately (granular) or when it dries (liquid).

my 2 cents after 35 years

p.s. The day care centers who are customers also prefer non-organic because they have googled (after my recommendation)
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Last edited by americanlawn; 08-20-2013 at 05:52 PM. Reason: day care
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Old 08-21-2013, 02:37 AM
greendoctor greendoctor is offline
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Quote:
Originally Posted by americanlawn View Post
Organic... a general term. Natural? Synthetic organic? How synthetic? Any more, most companies that sell "natural" organic fertilizer synthetically modify their products.

"Natural" organic fert can contain dangerous pathogens, contaminants and hazardous dust particles.

Manure runoff often causes many lakes & rivers "off limits" for swimmers.

We stopped offering "natural fertilizers" some years back because we were concerned about health issues. We prefer to use professional products designed to be used in the green industry. Too many folks have children, grandchildren, dogs, cats, etc. Customers also prefer non smelling products.

We offered natural organic fert on a trial basis. Now we use clean products that work, don't smell, don't contaminate, and homeowners can walk on their lawn immediately (granular) or when it dries (liquid).

my 2 cents after 35 years

p.s. The day care centers who are customers also prefer non-organic because they have googled (after my recommendation)
You know which "organic" I mean. A long time ago, I mentioned that making a client's property look or smell like a water treatment plant, stable or barnyard was not how I worked anyway. Only exception to that rule is kelp emulsion or the non pathogenic liquid biostimulants. BTW Milorganite is not legal in Hawaii. Too many heavy metals. C&C as well as many golf courses do spread sewage solids, then get the complaints.

It does not make economic sense for me either. I am not in the business of making compost. Any time I want to use it, I have to buy it. Get lots of broadleaf weeds free in that stuff as part of the bargain. On the other hand, I use clean liquid mixes that cost $5 or less per 1000. Reference that to the fact that any fertilizer starts at around $25 a bag, something containing coated urea is anywhere from $35-60 per bag.
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Old 08-22-2013, 07:34 AM
Smallaxe Smallaxe is online now
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Quote:
Originally Posted by americanlawn View Post
Organic... a general term. Natural? Synthetic organic? How synthetic? Any more, most companies that sell "natural" organic fertilizer synthetically modify their products.

"Natural" organic fert can contain dangerous pathogens, contaminants and hazardous dust particles.

Manure runoff often causes many lakes & rivers "off limits" for swimmers.

We stopped offering "natural fertilizers" some years back because we were concerned about health issues. We prefer to use professional products designed to be used in the green industry. Too many folks have children, grandchildren, dogs, cats, etc. Customers also prefer non smelling products.

We offered natural organic fert on a trial basis. Now we use clean products that work, don't smell, don't contaminate, and homeowners can walk on their lawn immediately (granular) or when it dries (liquid).

my 2 cents after 35 years

p.s. The day care centers who are customers also prefer non-organic because they have googled (after my recommendation)
Manure runoff into lakes and stream should've ended years ago... Most runoff into lakes and streams come from storm sewers in urban areas...
The idea that natural fertilizers are a health hazard is a pretty wide stretch in the propaganda dept.,,, assuming of course. that one is not stirring up dust clouds with it and breathing it into their lungs...
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Old 08-21-2013, 01:13 PM
Kiril Kiril is offline
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Quote:
Originally Posted by greendoctor View Post
Chemical N, P and K is no more harmful than table salt. People do swim in the ocean, right?
Come now GD. One has to merely pull a couple of MSDS's to demonstrate this is not true.
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Old 08-22-2013, 01:51 AM
greendoctor greendoctor is offline
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Quote:
Originally Posted by Kiril View Post
Come now GD. One has to merely pull a couple of MSDS's to demonstrate this is not true.
What is less likely to give someone E. coli, Listeria, Staphylococcus, Salmonella, or any number of parasites? Don't ever "come now" me. You hear? A child would have to eat fertilizer straight out of the bag or drink from the end of the spray hose to have a problem. DON"T EVER "come now" ME. I am talking about pathogens and parasites.
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  #10  
Old 08-22-2013, 10:03 AM
Kiril Kiril is offline
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Quote:
Originally Posted by greendoctor View Post
What is less likely to give someone E. coli, Listeria, Staphylococcus, Salmonella, or any number of parasites? Don't ever "come now" me. You hear? A child would have to eat fertilizer straight out of the bag or drink from the end of the spray hose to have a problem. DON"T EVER "come now" ME. I am talking about pathogens and parasites.
I won't ever "come now" you GD if you don't make ignorant statements like that which does nothing more than misleads your less informed peers and insults the more informed ones. You are better and more intelligent than that. And since we are in the reprimanding mood, don't you ever patronize ME, you hear?

But since you are talking about pathogens/parasites, what particular products specifically are you talking about? Compost, corn mean, bone meal, feather meal, etc ..... ? Or are you just talking about raw shiit? Should we also stop eating vegetables and meat as these can also carry these harmful organisms?

Here's a list of OMRI products for you. Please let us know which products we should avoid due to these harmful organisms.

http://www.omri.org/sites/default/fi...rops_alpha.pdf

As an example, perhaps the OP is concerned about his children picking up and eating the pretty blue fertilizer pellets he just put all over the lawn that look like candy? How many of those can they eat before becoming ill?

Last edited by Kiril; 08-22-2013 at 10:07 AM.
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