Square Foot Gardening Forum

Hello Guest!
Welcome to the official Square Foot Gardening Forum.
There's lots to learn here by reading as a guest. However, if you become a member (it's free, ad free and spam-free) you'll have access to our large vermiculite databases, our seed exchange spreadsheets, Mel's Mix calculator, and many more members' pictures in the Gallery. Enjoy.


Search
 
 

Display results as :
 

 


Rechercher Advanced Search

Latest topics
» How's the Weather Where You're At?
by sanderson Today at 4:24 pm

» Baker Creek's Seed Bank Store in Petaluma, CA
by sanderson Today at 4:18 pm

» Forum Poll: Social Media
by sanderson Today at 4:16 pm

» Spring Fever Anyone?
by trolleydriver Today at 4:11 pm

» Senseless Banter...
by sanderson Today at 4:02 pm

» EMT Clips
by sanderson Today at 3:59 pm

» Butterfly Junction
by countrynaturals Today at 3:18 pm

» CANADIAN REGION: What are you doing January 2017
by Kelejan Today at 3:04 pm

» Northern California & Coastal Valleys - What are you doing this month?
by trolleydriver Today at 9:07 am

» 2017 Burpee seeds are already on display at HD
by trolleydriver Today at 8:57 am

» Making Smoothies
by sanderson Today at 12:45 am

» Holy snow Batman!
by AtlantaMarie Yesterday at 8:18 pm

» Food Dehydrators
by sanderson Yesterday at 1:21 pm

» Green Ice Leaf Lettuce
by MrBooker Yesterday at 4:46 am

» New England January 2017
by Scorpio Rising 1/19/2017, 10:11 pm

» Gardening Australia
by Scorpio Rising 1/19/2017, 10:05 pm

» New Forum Feature
by Scorpio Rising 1/19/2017, 9:56 pm

» Microgreens Gardening
by yolos 1/19/2017, 9:45 pm

» Hi from Acworth GA
by AtlantaMarie 1/19/2017, 9:40 pm

» N & C Midwest: January 2017!
by Scorpio Rising 1/19/2017, 6:14 pm

» California's Drought
by sanderson 1/19/2017, 5:46 pm

» Winter Sowing vs. Winter Growing
by has55 1/19/2017, 3:32 am

» heirloom seed companies around a lot of the world
by ralitaco 1/18/2017, 10:58 pm

» What about ink on newspaper and cardboard for mulch?
by Scorpio Rising 1/18/2017, 9:23 pm

» Turan in the Western Mountains
by Turan 1/18/2017, 7:20 pm

» Third Year SFG in Canada
by trolleydriver 1/18/2017, 9:23 am

» 2017 SFG Adventures in Hampstead, NC
by ralitaco 1/17/2017, 11:23 pm

» Daikon radishes?
by Scorpio Rising 1/17/2017, 9:49 pm

» Anyone want walking onions??
by Scorpio Rising 1/17/2017, 9:22 pm

» How much to plant?
by trolleydriver 1/17/2017, 2:48 pm

Google

Search SFG Forum

Toxic chemicals in compost?

View previous topic View next topic Go down

Toxic chemicals in compost?

Post  tomperrin on 2/5/2012, 11:32 am

This article is from

Whatcom County Extension Service:

http://whatcom.wsu.edu/ag/compost/fundamentals/consideration_pesticides.htm



"(considerations before choosing a compost method)

pesticides and herbicides


Is it safe to use compost from yard wastes that have come in contact with pesticides, or other toxic chemicals? The major route of breakdown of pesticides is through microbial degradation, which is the process of decomposition. Any pesticide a homeowner can buy without a license will be broken down in the compost pile before the end of the process. The one exception to this is clopyralid, which is contained in certain Dow products. Confront is the product that homeowners might use. This is a long lasting herbicide, and vegetation that has been treated with this should NOT be composted, since the resulting compost can cause serious injury to sensitive crops.

Some typical home yard chemicals, and their reaction to composting:

Slug bait: Most commercial slug baits contain metaldehyde which, when exposed to water, quickly breaks down to a harmless alcohol. (Fresh metaldehyde is toxic to slugs, snails, birds, cats, dogs, raccoons, rabbits, and humans).

Herbicides: Some herbicides become harmless in a very short time in the soil and compost piles (such as Diquat, Paraquat). Others (such as 2,4-D and propanil) break down in compost piles, but only after thorough composting. Still others (such as arsenic, borate, picloram, simazine, sodium chlorate) are extremely long-lived and will probably survive most composting processes. Do not use organic matter in your compost pile if it was treated with long-lived herbicides, such as CONFRONT.

Insecticides: All contemporary insecticides will break down during the decomposition process. Old chlorinated hydrocarbon insecticides such as DDT (which has been banned for a long time) may survive.

Fungicides: Vegetation that has been just sprayed with a fungicide may suppress the development of decomposing fungi if it is added to the compost pile. A few weeks will degrade the fungicide enough so that it will not effect the decomposition process. Currently, one turf fungicide, PMA, contains mercury and may only be used by commercial pesticide operators. This should not be used.

Do not use pressure treated wood to construct compost bins. It is now well demonstrated that chemical components of the pesticide do leach from treated lumber. The compost may retain a good share of those chemicals, and some would be carried with water into the soil or drains below. This could affect the compost’s quality, as well as safety and performance."

tomperrin

Male Posts : 350
Join date : 2011-03-20
Age : 74
Location : Burlington, NJ Zone 7a (2012 version), in the hollow, surrounded by trees.

View user profile

Back to top Go down

Re: Toxic chemicals in compost?

Post  Lavender Debs on 2/5/2012, 11:55 am

Thank you! I've had this problem with bagged compost myself. Dead zone gardens are not fun...grow your own!

Lavender Debs

Posts : 2054
Join date : 2010-03-03
Age : 59
Location : Everett, WA USA

View user profile http://songs-of-coming-rain.blogspot.com/

Back to top Go down

What's not mentioned.....

Post  tomperrin on 2/5/2012, 12:07 pm

What's not mentioned in the article above is the presence or absence of hormones in composted cow manure. Horse manure should be free of all additives, especially if from a racing stable I would think. Bottom line and personal opinion, we should make our own compost whenever we can. It does take time tho.


Last edited by tomperrin on 2/5/2012, 12:08 pm; edited 1 time in total (Reason for editing : clarified first sentence)

tomperrin

Male Posts : 350
Join date : 2011-03-20
Age : 74
Location : Burlington, NJ Zone 7a (2012 version), in the hollow, surrounded by trees.

View user profile

Back to top Go down

Re: Toxic chemicals in compost?

Post  Sponsored content Today at 4:38 pm


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum