Movement of Nutrients to Plant Roots
1968; Elsevier BV; Linguagem: Inglês
10.1016/s0065-2113(08)60855-x
ISSN2213-6789
Autores Tópico(s)Irrigation Practices and Water Management
ResumoAdequacy of a plant nutrient is usually determined by the concentration of the nutrient at the plant root surface. Because a surface is, by definition, infinitely thin, the quantity of a nutrient contained in a surface is practically negligible. Consequently, plant roots remove significant amount of nutrient from this surface only if the nutrient can move readily from the interior of the soil to this surface. The rate at which the nutrient can move to the surface occur either by diffusion (net movement of the nutrient by thermal motion resulting from the existence of a concentration gradient), or by convection (conveyance of the nutrient to the surface as a result of the motion of the solution in which the nutrient resides). This chapter outlines the current knowledge of the diffusion of nutrients, the different flow mechanisms for bringing nutrients to the root surface, and the role of the plant in the movement of nutrients. An important area of recent study has been the use of available knowledge of soil chemistry (exchange reactions, adsorption isotherms, and chelation), along with the physical processes of diffusion and convection involved in the development of equations to describe the movement of nutrients to roots.
Referência(s)