Decomposition process of green beans residues applied on soil surface

  

Date Posted: 2/16/2018 10:06:08 AM

Posted By: franco crick  Membership Level: Gold  Total Points: 2067

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Decomposition of materials on the soil surface is initialized by macro organisms that breaks down the organic residues such as green bean residues into smaller dead pieces that are later incorporated into the soil as organic matter ready to undergo the processes of decomposition as described below:

i) The first step is the decomposition of easy to decompose compounds contained in green beans residues; This is mostly done by bacteria and fungi.The easy to decompose materials includes: soluble sugars, starch and amino acids.Bacteria decomposes substances such as soluble sugars and starches while, fungi breaks down carbon-complex compounds to release nutrients into the soil.Afterwards the material is now ready to undergo the next step of decomposition.

ii) The second step is decomposition of compounds that take several years to decompose contained in green beans residues; these compounds include cellulose where they are mostly broken up by fungi in most cases since they contain carbon -hard to decompose compounds.After cellulose is broken down the materials are now ready to undergo the next step of decomposition.

iii) The third step is decomposition of compounds taking up to ten years that may be contained in green beans residues; These includes compounds such as polymers and phenols that might be present in the green beans. They are usually broken down in up to years thus releasing both macro-nutrients and micro-nutrients and as a result the materials are now ready to undergo the last step.

iv) The fourth and the last step is decomposition of compounds taking tens, hundreds or thousands years to decompose; these are compounds such as lignin that are not easily broken down by microorganisms in the soil. Once all are decomposed this marks the end of the decomposition process releasing required nutrients and obtains the desired conditions for application on agricultural farms.
The last

product formed is humus which is the portion of soil organic matter that remains after added dead plants and animal residues completely undergoes decomposition.

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