Search results
Results from the WOW.Com Content Network
In agriculture, leaching is the loss of water-soluble plant nutrients from the soil, due to rain and irrigation. Soil structure , crop planting, type and application rates of fertilizers , and other factors are taken into account to avoid excessive nutrient loss.
Leaching is controlled largely by the hydraulic conductivity of the soil, which is dependent on particle size and relative density that the soil has been consolidated to via stress. [4] Diffusion is controlled by other factors such as pore size and soil skeleton, tortuosity of flow path, and distribution of the solvent (water) and solutes.
In pedology, leaching is the removal of soluble materials from one zone in soil to another via water movement in the profile. [1] It is a mechanism of soil formation distinct from the soil forming process of eluviation , which is the loss of mineral and organic colloids .
Nutrients in the soil are taken up by the plant through its roots, and in particular its root hairs.To be taken up by a plant, a nutrient element must be located near the root surface; however, the supply of nutrients in contact with the root is rapidly depleted within a distance of ca. 2 mm. [14] There are three basic mechanisms whereby nutrient ions dissolved in the soil solution are brought ...
Owing to irregular distribution of salt in the soil or to irregularity of the soil structure (figure 2), the leaching efficiency (E L) can be different from unity. Soils with a low leaching efficiency are difficult to reclaim. In the Tagus delta, Portugal, the leaching efficiency of the dense clay soil was found as low as 0.10 to 0.15. [4]
Roots have a negative electrical charge balanced by protons in the soil next to the roots, and these can be exchanged for essential nutrient cations such as potassium. [43] Decaying remains of dead plants in soil may form organic acids which, when dissolved in water, cause chemical weathering. [44]
Climate change also influences the length of heat waves, he said. This year is not the first to have over 100-degree days consistently. Other years with long heat wave periods include 2011 and 1980.
Soils supply plants with nutrients, most of which are held in place by particles of clay and organic matter [41] The nutrients may be adsorbed on clay mineral surfaces, bound within clay minerals , or bound within organic compounds as part of the living organisms or dead soil organic matter. These bound nutrients interact with soil water to ...