After reading this article you will learn about the passive and active transport of ions from the epidermis to xylem in plants. Passive Transport of Ions: Transport of ions from the epidermis to the xylem without any consumption of metabolic energy merely in consequence of the spontaneous disappearance of non-equilibria driven by a decrease in free enthalpy is known as [...]
In this article, some of the important interactions between nutrient elements as well as between nutrients and other factors are being described briefly. Nitrogen and Micro-Nutrients: Applied N has been reported as a possible cause of Zn deficiency in citrus plants. The application of N fertilizer accentuated the uptake of P and Zn by potatoes. Rice plants grown at low [...]
This article throws light upon the top five theories of ion uptake by plants. The theories are: 1. Lundegardh Theory 2. Contact Exchange Theory 3. Carbonic Acid Exchange Theory 4. Bennet-Clark's Protein Lecithin Theory 5. Donnans' Equilibrium Theory. 1. Lundegardh Theory (Electro-Chemical Theory) of Ion Uptake: Lundegardh (1945) proposed that an electrical potential gradient existing between the cell membrane of [...]