How do exchange phenomena take place in the soil?

How do exchange phenomena take place in the soil?

The ion absorption in the floor can be considered as reversible: the exchangeable ions of the adsorbent complex are in equilibrium with the solution of the floor : any change in the composition of the solution of the floor causes a change in this equilibrium by exchange : some ions of the complex go into solution…

What are the nutrients in the soil?

The main nutrients that the plant needs are nitrogen, phosphorus and potassium. They are part of the so-called major elements (which the plant needs in large quantities) and are the elements most likely to be missing in a floor.

What are the chemical characteristics of the soil?

The soil chemical properties correspond to the levels and availability of mineral nutrients for plants and to the parameters soil chemicals in connection with their return or availability. The results on nitrogen and phosphorus are presented in detail.

What are the main ions in the soil solution?

1.2 The main ions in the floor. Several other cations and anions exist in the floor ; some are trace elements and others have no effect on the floor but are present in the solution (the water) of floor. The basics ” are the following: Ca2+, Mg2+, K+, Na+.

How does the clay-humic complex work?

the clay complex–humic is a structure formed of clay and humus….Via positively charged cationic bridges and “biological glues”:

1. Calcium has a stabilizing action. …
2. Magnesium also forms cationic bridges but with a structure tightening action.

What are the minerals in the soil?

In the floorsthe main major elements are iron (Fe), aluminum (Al), manganese (Mn), calcium (Ca), magnesium (Mg), potassium (K) and sodium (Na). They are necessary for plant physiology.

What soil is acidic?

A earth is acidic if the ph is less than 7. A sol is neutral if the ph is equal to 7. A earth is limestone if the ph is greater than 7.

What is the role of the clay-humus complex in soil fertility?

flocculation of colloids, clayey and humics promotes an aerated structure and sufficient water storage; the clay-humus bond slows down the mineralization of the humified organic matter, and therefore the loss of organic matter likely to bind to the clay; clay bound to humus is detention.

How is the common core clay-humus complex formed?

Humus is obtained by transformation of organic matter by soil fauna. The molecules of humus and the sheets of clay associate in to binder, thanks to positive ions; cations⁶ (calcium, magnesium, iron, etc.), thus forming this clay complex–humic solid and organized (see diagram below).

What is the Soil Food Web?

A soil food web. In the soil food web, we see that bacteria and fungi, which are neither animals nor plants, are the ultimate transformers of organic matter. They have the particularity of transforming organic matter into mineral matter.

What are nutrient ions?

The nutrient ions, present at a given moment in the soil solutions, can have a fourfold origin:  the mineralogical reserve and the soluble salts,  the ionic stock fixed by the adsorbent complex,  the quantity immobilized at a given moment in the form organic,  ions from the soil solution.

What are the diets of soil fauna?

1. Diets of soil fauna In the soil, made up of animal and plant debris, live a multitude of animals, bacteria and microscopic fungi. A few very small animals can be isolated, observed and identified using the Berlèse device.

What are soil chemical properties?

Soil chemical properties. The chemical properties of the soil correspond to the content and availability of mineral nutrients for plants and to the chemical parameters of the soil in relation to their restitution or availability.