Use a Simple Compost Test to Avoid Contaminated Materials in Your Garden


| 6/3/2010 1:19:26 PM


Compost TestingI’ve read your reports about the problem of grass clippings, compost, manure and hay being contaminated with herbicide residues that can harm garden plants. Is there a way to screen these materials before I bring them into my garden?

Bonnie North
Asheville, North Carolina

 

You are right to be concerned about the risk of herbicides lurking in organic materials. The pesticides of concern are clopyralid and aminopyralid, both in the “pyralid” class. Here are some simple tests you can use to screen organic materials to be sure they don’t contain traces of these herbicides.

To test compost, set up at least six 4-inch seed pots, and fill half of them with potting soil. Fill the other half with a mixture of two parts of the compost you want to test and one part potting soil, and be sure to label the pots. Plant the containers with peas (in cool weather) or beans (in warmer conditions). If pyralid herbicide residues are present, germination will be poor, and seedlings that do grow will have curled leaf edges.



To test manure, plant at least six seedling pots with peas or beans, and let them grow for a couple of weeks. Mix a slurry of equal parts manure and water, and strain off 2 cups of liquid. Drench half of the seedling pots with the manure water; water the others as usual. If the manure is tainted, symptoms will appear within a few days.

martin podoll
7/18/2011 10:31:49 AM

Our community garden is in its first year. We have been fortunate with the manure thzt was used on the garden. you can view it on facebook Whitehall Community Garden






Subscribe Today - Pay Now & Save 64% Off the Cover Price

Money-Saving Tips in Every Issue!

Mother Earth NewsAt MOTHER EARTH NEWS, we are dedicated to conserving our planet's natural resources while helping you conserve your financial resources. You'll find tips for slashing heating bills, growing fresh, natural produce at home, and more. That's why we want you to save money and trees by subscribing through our earth-friendly automatic renewal savings plan. By paying with a credit card, you save an additional $5 and get 6 issues of MOTHER EARTH NEWS for only $12.95 (USA only).

You may also use the Bill Me option and pay $17.95 for 6 issues.

Canadian Subscribers - Click Here
International Subscribers - Click Here
Canadian subscriptions: 1 year (includes postage & GST).


Facebook Pinterest Instagram YouTube Twitter flipboard
Free Product Information Classifieds

}