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  Encyclopedia of Keywords > Science > Industry > Agriculture > Composting > Humus   Michael Charnine

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  1. Humus is a complex organic substance resulting from the breakdown of plant material in a process called humification.
  2. Humus is a term used to describe two different types of organic material in soil.
  3. Humus is an amazing soil conditioner. (Web site)
  4. Humus is a special and very important type of decomposed organic matter.
  5. Humus is a rich resource - and could easily be compared to a modern day bank.


  1. Usually, the soils there are yellow-whitish colored with very little humus. (Web site)
  2. Below the A and B horizons is the C horizon, a zone of little or no humus accumulation or soil structure development. (Web site)


  1. This replacement modifies the humus composition and amount, and impacts the formation of the soil.
  2. The vegetation installed on the ground provides the humus and ensures the ascending circulation of the matters.
  3. It is characterised by two maxima of C(org) content and domination of fulvic acids and humin in humus composition. (Web site)
  4. Corresponding paleosol has very distinct illuvial horizon and thick humus horizon with domination of structured humic acids in humus composition. (Web site)
  5. In parallel a first humus-bearing horizon is formed (the A horizon), followed by some mineral horizons (B horizons).

Stable Humus

  1. Stable humus tends to originate from woodier plant materials, eg, cellulose and lignins.
  2. Stable humus is the crucial center, the focus of the soil life cycle.
  3. Stable humus, the so desired, ideal stage of fertile soil, could be considered the connectiong link or connector of life.

Organic Matter

  1. Aridisols have a very poor concentration of organic matter (In this case decomposed material, humus).
  2. It is difficult to visibly differentiate humus from organic matter in other stages of decay. (Web site)
  3. Recalcitrant organic matter: Organic matter such as humus or lignin-containing material that few soil organisms can decompose.


  1. Yet it is difficult to define humus in precise terms; it is a highly complex substance, the full nature of which is still not fully understood. (Web site)
  2. The dark colour of humus (usually black or dark brown) helps to warm up cold soils in the spring.
  3. Chemically, humus is composed of very large molecules including esters of carboxylic acid, phenolic compounds, and derivatives of benzene.
  4. Rendzina is a dark, grayish-brown, humus -rich soil. (Web site)
  5. Humus has a characteristic black or dark brown colour, which is due to an abundance of organic carbon.

Organic Residues

  1. Humus is sometimes defined as the end product from the decomposition of organic residues. (Web site)
  2. It is not realistic to think that one can quantify or qualify humus production from contributions of organic matter to soil. (Web site)
  3. The formation of humus begins when organic residues of plants and animals come in contact with microbial life in the soil. (Web site)


  1. From this humus sol, the humic fraction is precipitated by acid which leaves a straw-yellow supernatant, the fulvic fraction.
  2. Humus should not be thought of as 'dead'- rather it is the 'raw matter' of life- the transition stage between one life form and another. (Web site)
  3. Humus can hold the equivalent of 80-90% of its weight in moisture, thus increases the soil's capacity to withstand drought conditions.
  4. These materials, when broken down, form humus, a dark, nutrient-rich material.
  5. Coupled with the abundance of oxygen in a porous sand, it is difficult if not impossible for humus to accumulate. (Web site)


  1. Cation exchange surfaces are typically clay minerals such as montmorillonite and organic materials such as humus.
  2. However, humus can have a far greater capacity to adsorb cations than clay, especially in a soil with a near neutral pH. (Web site)


  1. Old, stable humus is biologically resistant. (Web site)
  2. The assimilation of these nutrients from the original residues by microorganisms is the first stage in the process of creating humus. (Web site)
  3. Some is mineralized back into plant food and some is changed into biologically resistant compounds that accumulate as components of humus. (Web site)
  4. The degree to which free oxygen exists in soil plays a major role in regulating the favorable or unfavorable conditions under which humus is formed. (Web site)


  1. Some very stable humus complexes have survived for thousands of years. (Web site)
  2. The formation of new humus is critical to maintaining a stable presence of this asset in the soil. (Web site)
  3. The leached material from the A horizon is deposited in the B horizon as a humus -rich horizon band or as a hard layer of sesquioxides. (Web site)
  4. These decay resistant compounds are what humus is made of. (Web site)
  5. Much of this translocated material may already be humus. (Web site)


  1. Unfortunately, many agricultural and horticultural practices are essentially mining humus. (Web site)
  2. Excessive applications of lime can significantly accelerate the decomposition process of humus. (Web site)
  3. Current agricultural and horticultural practices have little effect on old, stable humus. (Web site)
  4. Humus is essentially a massive storage battery containing energy that was originally derived from the sun. (Web site)
  5. However, many of those methods of cultivation can destroy new humus in the formative stages when it is more vulnerable to decay than its older counterpart. (Web site)


  1. In clay soils, humus forms an alliance with clay particles. (Web site)
  2. Clay, humus, and other coatings have been leached from this eluvial horizon, leaving light-colored sand and silt particles.


  1. The soil's colloidal particles, clay and humus, are negatively charged and attract cations.
  2. Specifically, CEC is the amount of negative charges available on clay and humus to hold positively charged ions. (Web site)


  1. Unfortunately, conditions for the development of humus in sand are not always ideal. (Web site)
  2. The accumulation of humus is naturally easier in clay soil than in sand because the environmental conditions for decay bacteria are often not as ideal. (Web site)


  1. Figure 1 shows that at a temperature of 88 degrees F, in well aerated soil, humus can no longer accumulate. (Web site)
  2. Unfortunately, the value of humus is, oftentimes, not fully realized until it is severely depleted and its benefits are no longer available. (Web site)


  1. The biochemical structure of humus enables it to moderate – or buffer – excessive acid or alkaline soil conditions. (Web site)
  2. It is proposed that latisols (ultisols) are caused by the extremely alkaline midgut of humus eating termites.


  1. Soils that exist in warmer regions of the earth tend to have lower native levels of humus than soils in colder areas. (Web site)
  2. If CO2 did not evolve, atmospheric carbon would not be available, the earth would be buried in humus and life could not exist. (Web site)


  1. Humus which is readily capable of further decomposition is referred to as effective or active humus. (Web site)
  2. The end products of the decomposition of humus are mineral salts, carbon dioxide, and ammonia.
  3. When the organic matter has broken down into a stable humic substances that resist further decomposition it is called humus.
  4. In humus horizons of buried soils the prerequisites for magnetic minerals synthesis and decomposition change. (Web site)

Plant Residues

  1. These methods utilize dilute sodium hydroxide (2 percent) to separate humus as a colloidal sot from alkali-insoluble plant residues.
  2. The undigested portion of the residues accumulate as humus. (Web site)
  3. Their populations are controlled by the amount and type of residues introduced into the soil and the production of humus is controlled by these organisms. (Web site)
  4. However, excessive lime applications can hasten the destruction of humus at a pace greater than the plant residues can accumulate it. (Web site)


  1. However slight, decay still occurs and eventually even old humus will cycle back from where it came. (Web site)
  2. Microbes will eventually recycle all the elements in humus back to where they initially came from, even if it takes a millennium to do it. (Web site)


  1. When humus particles called micelles are formed the chemical composition is predominantly carbon, hydrogen, nitrogen and oxygen (see figure 7). (Web site)
  2. About 25 years later, attention was called to the role of microorganisms in the mineralization of nutrients from humus. (Web site)


  1. Science > Industry > Agriculture > Composting
  2. Encyclopedia of Keywords > Nature > Matter > Soil
  3. Glossaries > Glossary of Soil Science /
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  Short phrases about "Humus"
  Originally created: April 03, 2008.
  Links checked: May 02, 2013.
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