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Cont'd - Adding Organic Matter - 2nd Key to Soil Improvement

If you are just joining me I recommend you read the articles that preceded this article. Here are the links:

Soil Improvement – Your Foundation for Success;   Soil Preparation – 1st Key to Soil Improvement; Cont’d. Soil Preparation – 1st Key to Soil Improvementfirst part of Adding Organic Matter – 2nd Key to Soil Improvement

Repeated Tilling and Hoeing -Their Effect on Organic Matter

One of the things that I’ll bet will come as a shocker to many is the fact that repeated tilling and hoeing destroy organic matter in the soil.  Tilling and hoeing are so common and so much a part of human culture worldwide that it’s almost sad to have to think of them as being something that is not particularly good for our soil.  The good news is —-the key word here is ‘repeated‘.

Tilling and hoeing expose soil organic matter to more oxygen and thus oxidation. Oxidation “burns” away the organic matter.

Your plants need oxygen to live and the life forms in your soil need oxygen to live. One of the reasons you prepare your soil deeply when you dig a garden is to aerate the soil.  In other words you introduce oxygen into compacted layers of the soil. But, if you continually do this, you destroy the organic matter you are trying to keep.  Soil organisms need enough time to do their work without being disturbed.

After your initial soil preparation, assuming that you follow the other practices involved in keeping your soil healthy and alive—- and you continue to add organic material to your soil——-there will be little need to till or to repeatedly hoe.  The conditions that call for tiling and hoeing will no longer exist.

Repeated Hoeing and Plowing/Discing – Why its Bad for Your Soil

Repeated hoeing and plowing/discing also destroy the natural structure of the soil that you are striving to maintain for the benefit of your plants.  This natural structure with its root channels and cracks and large pores are necessary to conduct water into the soil during rainfall.  Some of the cracks and channels are used by the roots of your plants to move through the soil.

“Plough Pan” and “Hoe Pan” – What are they?

When ground is plowed or hoed a “plough pan” or “hoe pan” is created as a result of a smearing action at the bottom of the plough or hoe.

You have to think this one out and imagine yourself hoeing in slow motion.  The hoe strikes the ground and you pull if forward.  As you do it loosens the top part of soil and smears the soil under the hoe, making it compact.

Plowing with heavy equipment magnifies the above example many times over.

As you know, one of the main reasons for your deep soil preparation is to make the top soil and subsoil loose.  When subsoil is compacted (which is the result of plowing and hoeing) it can keep roots and water from infiltrating deeply into the soil.

Compromises?

There will be times you feel you have to compromise in order to keep going forward.  We all have to face situations like that sooner or later.

When you are weighing your situation keep the principles of sustainable agriculture in mind and stay as close to them as you possibly can. Just so you’ll know more what I mean I will give you an example of something that happens to me sometimes:

Once I prepare a garden bed, I never till it again.

There are times that I run out of organic material (or mulch) to cover a bed that has just produced a crop.  In most cases the mulch that was on the bed with the crop has decayed.  If it turns hot the soil bakes and it becomes unsuitable to plant in immediately.

In this case, I usually wait for a soaking rain and then cover the bed heavily with straw I have since acquired.  If when I get ready to plant again it is too compacted, I will turn it with a shovel and/or break it up with a hand digger or hoe. That’s a compromise I can live with. And its a compromise from which I think the soil quickly recovers.

The bigger compromise —–and the one I never do willingly-—-and the one from which my soil does not recover quickly —–is having a garden bed without a protective mulch covering.   Until I am able to replace enough organic matter —— I need not plant again—-because I will not get the results I want.

Organic Material Makes Organic Matter – So What Organic Materials Do I Use?

Organic material (anything living) decomposes to make organic matter (decayed living matter.)

For your organic garden you will want to use primarily plant material and manure (horse, cow, sheep, chicken) if you have access to any without herbicide residue.

As an organic gardener you will want to stay away from sludge and the dung of dogs, cats, & hogs.

How Much?

I have never had enough organic material and I don’t really know any organic gardener who has.   If you have  – consider yourself very fortunate.  You’ll have one of the best gardens.

Diversity

Use as many types of organic materials as you have access to.  Maximum soil diversity (more organisms to help your garden) depends on diversity of organic matter.

Organic materials used in the garden can include a wide range of things.  Some of the most common are  compost, leaves, leaf mold, stems, lawn clippings, plant residue (like straw or the your old daylily foliage or even weeds** that have not produced seeds), kitchen scraps*, wood chips, pine needles, and manures.

* Do not include meat in your kitchen scraps that you put in your garden as it will draw undesirable carnivores to your garden.

** If you mow or pull weeds that have not produced seeds they may be used as organic matter for your garden.  If they contain seeds — they will get into your garden soil —–and grow!

Whether to Put into the Soil —-or Leave on Top of the Soil

When organic material (biomass) is incorporated into the soil, there is a short period of high activity by soil life while decomposing the material.  Soil organisms use the nitrogen produced and if there are not adequate amounts of nitrogen already in the soil for both plants and organisms, the plants in that soil miss out on the nitrogen —at least until the process is complete.

Obviously this is only a problem if you have crops growing in the soil — but a very easy problem to solve.  There are materials you can leave on top ——-for example straw, leaves, pine needles etc.  As mulch they will break down more slowly than if they were incorporated into the soil, but that is not usually a problem.  Thus, the nitrogen in the soil will still be available for the plants.

99% of the time I put all organic material on top of the soil and allow it to decay.  It saves me a lot of time and seems to work wonderfully.

Years ago, when you could readily get manures without herbicide residue, I would get cow manure or horse manure whenever I could.  Sometimes I would turn it into the soil.  Other times I would spread it on top and cover it with straw.

And then there is compost that you can leave on top or incorporate since it is organic material that has already decayed.  (Again, it is the decomposition of the organic material that takes nitrogen.)

The last part of Adding Organic Matter – 2nd Key to Soil Improvement will follow in the next post:

Still to come is:

  • Compost
  • Cover Crops
  • Reasons to Use Cover Including Why Roots are Important
  • A Few Words of Warning
  • What I Use
  • Where to Find a Good Cover Crop Chart

4 comments to Cont’d – Adding Organic Matter – 2nd Key to Soil Improvement

  • michael john mcbratney

    I’ve just found your site and am enjoying your knowledge.I haven’t seen any mention to minerals and trace elements being added to your soil. I am as of recently been using a natural product called AZOMITE.Your thoughts on this would be enjoyed.Thank you and I look forward to reading more of your observations.

  • Theresa

    Nice to have you reading Michael. Welcome to TMG!

    When you said no mention of minerals and trace elements being added to my soil — I am assuming you mean no mention of them being added separately as an amendment. Hopefully they are being added in compost and other organic materials that breakdown to form humus in my soil.

    If you have not already read it — you may find my post on soil testing of interest http://tendingmygarden.com/soil-test-the-pros-and-cons/

    As you will discover the more you read TMG — I try to keep things as simple as possible — and let nature do the complicated stuff. I am however always open to new knowledge that would make my garden even better. However, I am very slow to accept anything until I really am well versed on it and am convinced that it is not just hype — but something that I really need to do for really good reasons.

    I do feel there is merit in rock dust and most especially glacial rock dust. I am trying tiny bits of the glacial rock dust in various places this year for the first time. I’ll write about it in future posts.

    I personally would not use Azomite because it’s my understanding that it has been tested to have radioactive material. Supposedly Nephi, Utah is right next to the Proving Grounds where nuclear testing was done in the 40s. I have not researched this in detail — but that was enough to make me want to steer clear of Azomite.

    I am using Gaia Green Glacial Rock Dust for my experiments.

    Hope this answers your questions.
    Theresa

  • Mindy Bird

    I have followed your blog for more than a year now, and I have a question about mulch and adding organic matter. I’ve read through some of your archives trying to find what I’m looking for, but can’t seem to find it.

    I tried having ground cover/mulch (chopped up tree leaves from my property) this past year on my new gardens, but they all blew away. So now my new gardens are bare, which I was hoping they would be covered all winter but were not. I want to add both compost (organic matter & manure mixture) AND straw. When is a good time of year to add each?

    Also, after I have a straw mulch out on my gardens, how do I add compost again? Do I add the compost just on top of the straw? Do I gently rake back the straw, add the compost, and replace the straw?

    I hope my questions make sense. If you have already written posts on this very thing, please direct me there! I love reading about your gardening techniques and am planning to pre-order your book!

  • Theresa

    Dear Mindy,

    Sure sorry to hear about the wind blowing your leaves away. There are several things you can try next year to try to prevent this.

    Wait until the leaves are rained on to put them on AND/OR chop them with the lawn mower and then get them wet; — place them on the bed and then cover with wet straw. If that absolutely does not work — the cover crops are the answer for you next year. Oats planted in late summer or fall will get good growth before winter and then winter kill. But the roots will hold the soil and improve it. There are other cover crops you can use (read all my posts on cover crops) but the oats is an easy one and will do what you want without a lot of effort or learning curve.

    To replace some of the organic matter that has been oxidized by the soil being bare this winter, you can plant buckwheat thickly in your beds for a quick boost to your soil. You’d plant in May after the last frost and cut about 6 weeks later. You could still plant hot weather crops in the same beds.

    The best time to add your manure and organic matter mixture and straw is in the fall. You can do it now – if you do it right away. You should have enough time for the manure to be decayed enough to plant hot weather crops in April or May. I would not plant cool weather crops into the manured bed this year . It’s best to have manure on your beds at least 6 months. See Toni Brock’s question to me in the comment section of post http://tendingmygarden.com/organic-pest-control-eliminate-the-cause/ and see my answer.

    Also you may want to review these 3 posts:
    http://tendingmygarden.com/comments-on-a-readers-plan-cover-crops-turning-the-soil-and-more/

    http://tendingmygarden.com/winter-rye-as-a-cover-crop-2-strategies/

    http://tendingmygarden.com/cover-crops-buckwheat-is-one-of-the-easiest/

    Regarding adding your compost. Whichever way you do it — you’ll be ok.
    I would just go ahead and “sprinkle” the compost on top of the straw. It will sift down just fine. You could take your hand and just shuffle the straw a bit and the compost will immediately fall into it.

    I’m glad you’re planning on geting my book. It will help you a lot. I’m almost finished the draft and will go back over it to make sure I have everything in it that needs to be in it. Can hardly wait until it’s finished!

    My congratulations to you for working so diligently to improve your soil and keep it covered.

    If you have more questions, please feel free to write to me. I will be most happy to help you as time allows.

    Keep up the good work!
    Theresa

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