09 Oct How to Manage the problematic soils.
समस्याग्रस्त मिट्टी का प्रबंधन कैसे करें For the management of problematic soils, some general principles has to be considered for proper implementation of the reclamation measures. The total soluble salt concentrations in the root zone have to be decreased to control osmotic effects on plant growth. Maintenance of total soil moisture tension must be ensured at optimum level so that plant roots can absorb an adequate amount of water. Water flows through the soil in the direction of maximum decrease of hydraulic head and the flow velocity is proportional to the hydraulic gradient. The design and layout of drainage system are controlled by this principle. The availability of good quality water is of paramount for leaching and drainage of soluble salts. The Salt concentration in soil solution upward movement of salts and their accumulation increase with an increase in the evaporation and transpiration from the surface of the soil and the vegetation, especially when the ground water table is shallow. Increase or decrease of salts in the root zone depends upon whether the salt inputs are higher or lower than the salt outputs. The cations in the soil solution and those adsorbed on exchange complex are in equilibrium with each other. The dispersion and effectiveness of amendments are controlled by this principle. Management of Saline and Non saline alkali...