Skip to main content

Soil Health: Level 1 - Introduction of Terms

Level 1 - This post is intended to introduce terms which describe the essential components of a healthy soil. This discussion is complicated, so we will provide increasingly detailed levels of information, at the risk of oversimplifying in the beginning. Next week look for Level 2 - Description of Terms. 

All plant varieties, found on earth today, evolved to thrive in a soil system filled with variety. Ancestral soils teamed with a variety of organisms and carbon compounds, which supplied abundant nutrients and water. What does a varied soil system look like when compared to a conventionally managed soil system?

A varied, or healthy, soil system contains the following essential components:
  • Carbon Compounds:  
    • Labile Carbon: 
      • Carbons which easily decay, such as those present in microorganisms, compost, crop residues, manures, and mulches.
      • These materials release mineral nutrients back into the soil.
    • Recalcitrant Carbon:
      • Contains Humic Acids which are essential to a healthy and productive soil, Humic Acids are known commonly as Humus.
      • Humic Acids endure the stress of time and will remain in an undisturbed soil for thousands of years.
      • Humic Acids improve soil structure, for as long as they remain in the soil.
      • Humic Acids increase a soils capacity to hold water more than any other soil component.
    • Both Labile and Recalcitrant Carbon levels are often very low in conventionally managed soils systems, because the pipeline of their formation has been compromised. 
  • A Diversity of Organisms:
    • Soil organisms, such as Mycorrhizal fungi, beneficial bacteria and earth worms, are absolutely essential in soil heatlh management.
      • Mycorrhizal fungi greatly improve soil structure and nutrient uptake.
      • Beneficial bacteria provide a wide range of benefits, including Nitrogen fixation.
      • Earth worms contribute enzymes and decompose labile carbons.
    • The diversity of microorganisms increases as vegetation types increase.
    • The redwood forests soils of California, with their incredible diversity of vegetation, provide abundant  fertilization as a result of this biodiversity. 
    • The lack of biodiversity, in conventionally managed soil systems, contributes to unhealthy and unproductive crops.
  • Nutrient Availability:
    • Mycorrhizal fungi increase plant root mass and solubilize mineral nutrients. 
    • Humic Acids increase Cation Exchange Capacity (CEC), thereby storing mineral nutrients.
    • Nutrient availability is greatly decreased when Mycorrhizal fungi and humus are not present.
    • Please see our blog for more information: Understanding the Importance of Cation Exchange Capacity .
  • Macroaggregates
    • Macroaggregates result when Mycorrhizal Fungi bind soil particulates together.
    • Humic Acids have been shown to increase macroaggregate formation.
    • Tilling of soil will destroy these structures, increase erosion and create soil compaction. Plaese see No Till and Water for interesting information on this topic.
    • Please follow this link for more detailed information: NRCS Water Stable Soil Aggregate Handbook .
  • Increased Moisture: 
    • Moisture must first be absorbed -  water will  penetrate soils when macroaggregates are present. 
    • Humic Acids and decomposing surface organic matter will then retain water which has penetrated an uncompacted soil.
    • Water in conventionally managed soil systems frequently runs off without being absorbed.
  • Decomposing Surface Organic Matter:
    • Mulches can be described as a decomposing surface layer which insulates and protects the soil from environmental stresses. 
    • This organic matter will eventually become part of the labile carbon fraction of the soil.
    • Conventionally managed soil systems often lack even thin layers of surface organic matter.
    • Please see Got Mulch? for more information.
Our most precious natural resource, healthy top soil, is disappearing at alarming rates. For generations modern soil management practices have systematically reduced the diversity of soils, resulting in reduced yields. To compensated chemical fertilizers have been added, the detrimental effects of which have reared their ugly, ineffective and costly head.
Stay tuned for Level 2.
Written by:
Aurora Fabry-Wood
Staff Biologist

Comments

This is great topic done by you with us. After searching a long while I found this enough tips as you shared.
Kamagra said…
This is very great thing you have shared with us. Now I found enough resources by your tips about this issue, Thank you.
Thank you all for reading. Please ask any questions you may have!
-Aurora

Popular posts from this blog

Weed Identification: Goatheads or Stickers

Goatheads ( Tribulus terrestris ) are native to Southern Europe, Asia, Africa and Australia. Goatheads are also called stickers, sticker weed, bullhead, devil’s weed, and puncturevine. Goatheads are easily recognized by their prostrate growth form, leaves with leaflets, yellow flowers, and stickers (Goatheads). If you miss’em visually then they will stab you painfully in the fingers as you work your garden, or stick to your clothing and shoes. Goatheads are the primary reason local bicyclists must get “thorn proof” tires for riding on area trails and streets. Goatheads have prostrate stems that radiate outward from one central point. Leaves are compound with smaller leaflets. Lemon yellow flowers form along the stems and fertilized flowers form fruits.   Fruits consist of several attached structures called nutlets (Goatheads). Each nutlet is a single seed that becomes hard or woody when mature. Each seed has two sharp spines that easily penetrat

Weed Identification: Sand Bur

Sand Bur ( Cenchrus longispinus ) is native to North America. It has other names like sand spur, long-spined sand bur, hedgehog grass, and bur grass . Sand Bur is an annual grass usually growing with a prostrate growth form. It is similar in appearance to other grasses prior to seed formation. Individual plants may be 3’ in diameter, sometimes larger. Sand Bur is a common weed of sandy soils but also grows well elsewhere. Sand Bur will often root at stem nodes that are touching the ground. The root system of Sand Bur is shallow and fibrous making them easily pulled (when immature). Sand Bur produces a flowering spike. As seeds begin to form Sand Bur is easily recognized by its numerous sharp or burred seeds or long spines. As the burred seeds mature they are easily separated from the mother plant and their sharp spines stick to virtually anything. Sand Bur can disseminate its seeds long distances because its sharp spines will hitch a ride on skin, animal hides,

Mulberry Tree

The Mulberry tree ( Morus alba ) is also known as white mulberry. Mulberry trees are fast growing, deciduous trees that are native to China. Mulberry trees can reach 25’-30’ tall and 35’-40’ wide, or larger. Fruitless mulberry or male trees are generally considered more desirable than the female or fruit bearing trees. However, fruitless mulberry trees are prolific pollen producers and are banned in some communities because of allergen potential. Mulberries can grow 4’-6’ per year producing a tree canopy that is more wide than tall. Where water is not limiting, mulberries make great shade trees producing a deep, dark, shade canopy. Leaves are large and sometimes variable in shape. A few strategically planted mulberries can shade an entire yard. The female mulberry tree produces abundant sweet fruit that resemble blackberries. Female trees are very messy because of fruit drop so plant them away from sidewalks, driveways, and the house. Mulbe