L is for Loam, Love Great Silt Loam Soils

L is for Loam, Love Great Silt Loam Soils

I can remember a time when I thought of dirt as something that only seemed to change about it was the color. I had noticed it when my family took vacations and even in looking at the soils in my grandparent’s yard since grandmom was an avid composter. But when I moved from Memphis to Enid, Oklahoma, the color change was so stark with the red soils totally disconnecting from the browns I had always called home. 

I love SoilSure it was before I started working in agriculture, which has been a long time but those memories are clear. It wasn’t until I got to know farmers that I began to understand some of those differences and the meaning behind them. And it wasn’t until I lived in a farming community and called loam soils home that I really began to understand. So while this could be the post for the letter “s,” I think it works well for “l.”

If you aren’t familiar with various soil types, the experts I turn to are farmers, crop consultants, extension specialists & agents and members of the Soil Science Association of America. In fact, the SSAA has a great website that tells the story of soil. And I have an “I <3 soils” sticker from the effort on the bulletin board at the office.

Understanding Soils

The way soils were formed has a big impact on their appearance, the nutrients and more. I played around thinking about what sort of information to share on soils and loams in particular and found a great resource for basic soils information from the Queensland (Australia) government. So I guess there’s no reason to recreate this  info when they put it into words so well!

Soil is the thin layer of material covering the earths surface and is formed from the weathering of rocks. It is made up mainly of mineral particles, organic materials, air, water and living organisms—all of which slowly yet constantly interact.

Most plants get their nutrients from the soil and in turn, are the main source of food for humans, animals and birds. Therefore, most living things on land depend on soil for their very existence.

Soil is a valuable resource that needs to be carfeully managed as it is easily damaged or washed or blown away. If we understand soil and manage it properly, we will avoid destroying one of the essential building blocks of our envrionment and our food security.

via Understanding soil (Department of Natural Resources and Mines).

There is also a good handout on soils available from Penn State.

Who needs good soil?

A lot of people may answer the question of “who needs good soil?” with things like “farmers” or “gardners” but I suggest good soils are critical for all of us and it is inherent on all of us to protect them. That kind of dedication is clear on the I Love Soil site when it says:

planting in south Texas clay soilsSoil is an amazing substance. It is a complex mix of ingredients: minerals, air, water, and organic matter—the countless micro-organisms and the decaying remains of once living things. Soil is made of life and soil makes life.

To the farmer, soil is where crops grow.

To the engineer, soil is a foundation to build.

To the ecologist, soil supports and connects ecosystems.

To the archaeologist, soil holds clues to past cultures.

To craftspeople, like potters, soil provides clay to make things.

To the soil scientist, soil is all of these things.

Soil has been called “the skin of the earth” because it is the thin outermost layer of the Earth’s crust.

Like our own skin, we can’t live without soil.

via The Story of Soil | I Heart Soil.

What is a loamy soil?

loam soilsSince I wrote this because loams prompted my more detailed awareness in the importance of soil a couple of decades ago, I figure I should explain loams. This definition of loamy from the Soil Science Association may leave a question or two for folks who haven’t studied soils, but I have to serve up what the experts say and I think its a good start:

loamy (i) Texture group consisting of coarse sandy loam, sandy loam, fine sandy loam, very fine sandy loam, loam, silt loam, silt, clay loam, sandy clay loam, and silty clay loam soil textures. See also soil texture. (ii) Family particle-size class for soils with textures finer than very fine sandy loam but <35% clay and <35% rock fragments in upper subsoil horizons.

So loams are a whole group of soils, just like clay soils then on the spectrum you get the combinations of the two. The photo here shows the silt loam soils that became a familiar feeling underneath my feet during my years in the Mississippi Delta. Those silt loam soils (aka ice cream soils) are perfect for planting cotton! And we are getting to planting time which is a time of great promise and hope for farmers, even if planting is running late due to the cold spring.

A to Z Agriculture blog post series


M, N, O, P, Q and R are for ____

I’d love to know what your thoughts are on loams and other soils. This week I will be writing M, N, O, P, Q and R posts. Yes, we are on the downward slope will be brought to you by the group of letters I mentioned, so what do you think the word of the day should be?

See the other posts in this series by clicking on the logo at right and reviewing the letters, or by browsing the A to Z ag tag archives. You should also feel free to add ideas for upcoming letters!

13 thoughts on “L is for Loam, Love Great Silt Loam Soils

  1. When I saw the title of this post and started reading it I had a wave of memories come back to me from being on the FFA soils team! I remember learning that soil is not dirt and the true difference between the two. I was lucky enough to be on the soil judging team 2 different years and I remember going out to random places on the side of the road, in farmers pastures and corn fields testing and seeing different types of soils. Our Ag teacher even told us that if we rubbed the soil between our teeth we could determine the different types better. I think he was joking with us and was shocked when we told him that we did it during contest and it really helped us. Learning about soil was a big thing in my FFA career and it’s very important in Agriculture and I’m glad you did a post about it!!


    1. That is awesome! I have really enjoyed doing this A to Z on agriculture… it is encouraging me to write about things I think about but hadn’t thought about writing about before. I’m enjoying it and the reactions to it. 🙂

  2. Oxisol, mollilsol, silt, sand, loam, clay, CEC, N cycle. It’s like college all over again. I’ve still got all my lecture notes, quizzes, exams, assignments from all my agronomy classes at Purdue. It’s amazing how smart I used to be when I flip through them!

    1. LOL! Too funny! You pulled out a bunch of things there seemingly out of thin air! Since I never took classes, I don’t have that background but I did work for a guy who had a PhD in soil & water relations a few years ago… I should have tapped into him on this and the irrigation post!

  3. We have the worst soil in Florida! It’s a wonder anything grows in our sand. Seriously, I feel like I live on the beach if I don’t water for a week. –Which wouldn’t necessarily be bad. Maybe I should retire the old lawn for a giant sand box. What do you think?

    1. Thank you for stopping by! Really sandy soils are tough… there are some native grasses and all that do well in sandy soils… things that don’t really need much water. There should be a good nursery or something nearby that could halp you find plants that need less water.

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