Monday, February 11, 2008

Black walnut hulls: turning trash into treasure

Chris Chmiel is reinventing compost at his Albany, OH farm, Integration Acres Ltd.

Although Chmiel is widely known for his involvement in the Ohio Pawpaw Festival, through the help of a grant from the Sustainable Agriculture Research and Education program (SARE), he has begun research on composting black walnut hulls for his SARE project “Black Walnut Hulls: Turning Trash into Treasure” trying to discover how useful they can be in compost, despite their bad rap.

“Almost every backyard home gardener has heard of the allelopathic effects of the black walnut tree,” said Chmiel.

“It seems to be a part of the local folklore. What this means is that whatever successful applications are developed, sophisticated and educational marketing tools will be needed.” Allelopathy refers to the harmful effects that one plant has on another plant.

With five piles of composting black walnut hulls, Chmiel concluded that he could make a profit from the waste. “I had a lot of black walnut hulls lying around and I've learned that turning ‘waste’ products into something valuable has been a key to my business' financial success. I also knew that this is a type of ‘black gold’ worth something,” explained Chmiel.

“I figured that the utilization of free local resources like the shredded leaves, wood chips and barn bedding is a good and realistic model for my self and other farmers interested in sustainability,” said Chmiel.

Chmiel has seen success in his own pawpaw patches with the black walnut hulls. He had some straight, two-year-old black walnut hull compost left from 2003. He then spread some of it in pawpaw patches as light mulch. It appeared to break down nicely in the soil, contributing organic matter. He reported that fruit production in these patches seems to be stable or improving.

“I've seen local growers and landscapers starting to use and appreciate this valuable natural resource. I think the most interesting thing to the people using the product is that the pH is 7.3 and the organic matter content is 79%. Most people assume it is an acidic product and are surprised that it is a sweet product.”

Hank Huggins, a local native plant and gardening enthusiast has experienced success as well.

“Hank tried a truck load of the 2003 composted black walnut hulls. He mixed it into beds for raspberries. He says they’re alive and will see how they produce in the coming year,” said Chmiel.

“I think this is a great way for walnut hullers around the country to maximize their on farm resources while providing a local, natural product that should be quite cost competitive to alternative sources. I knew that the SARE guidelines would apply well to this project, and that other walnut hulling operations around the country could benefit from some of this research,” said Chmiel.


Unknown said...

Hi, I just had a quick question, doesn't black walnut hull have a chemical in it that can kill some plants ?

Anonymous said...

It does. Its produces a chemical called 'juglone' but check this link out... it has a list of species that thrive on it, and inversely, species you need to avoid.
After composting walnut tree byproduct you can eliminate that danger but it has to be 6mths compost time.

John Rabeler said...

I have. Accumulated a pile of hulls for the first time in October. 2016. They are resting on ground I wasn't using yet on my 1 acre farm, garden. Since compost happens naturally with or without outside help, my plan is to watch this 4 ft. By 6 ft. Patch, 3 to 4 inches deep, to see if anything grows up thru it, or if it slowly decomposes over time. This will give me an idea how long the natural process takes and if the soil needs to be turned or just planted into. This year I will be a buyer, huller location for Hammons black walnuts so I will have a lot more hulls to work with and look forward to enhancing my soil with the compost. The study done by Chris Chmiel should be very valuable to me. I am willing to add my experiences to what you have already leaned on the subject. John Rabeler ,9323 Stubbs road, Kansa city,mo. 64138' 816 469 5025.

Diacrum said...

What happened John Rabeler? Did it work out for you with the walnut hulls? Thanks.

5678pink said...

Updates on outcomes please? I'm thinking of using walnut "waste" to create a living roof on one of my sheds... kind of like thatching. Then thinking about planting succulents up there.