In soils that contain high levels of sodium, sodium displaces calcium and magnesium that are adsorbed on the surface of clay particles in the soil. As a result, the aggregation of soil particles is reduced, and the soil tends to disperse. When wet, a sodic soil tends to seal, its permeability is drastically reduced and, therefore, the water infiltration capacity is also reduced. When dry, soda soil becomes hard and lumpy. This can result in damage to the roots.
PHYSIOLOGICAL CONDITIONING OF THE ROOT
In addition to the changes caused by the branching and extension of the root, its metabolic activity modifies the edaphic environment in different ways; For example, the rate of absorption of water and ions creates the play of chemical forces that change the flow of ions in the soil through mass flow or diffusion; Likewise, the exudation of ions, metabolites or proteins induces changes in the chemical properties of the rhizospheric soil solution, altering the buffer capacity of the soil, solubilizing fixed or precipitated nutrients and promoting the association with beneficial microorganisms such as rhizobacteria and mycorrhizae (TESTER AND LEIGH, 2001).
(Sánchez et al., 1998), points out that the behavior of the asparagus crop presents significant differences between the different latitudes, due to the marked climatic seasonality in the northern hemisphere, where conditions of a single sprouting occur. However, for conditions of active growth throughout the year, as is the case in Peru, there is an additive accumulation of carbohydrates in the maturation of each generation of shoots, because each shoot is considered a small life cycle.