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 [...]
After reading this article you will learn about nitrogen in relation to physiology, growth and response of crops. Nitrogen in Relation to Physiology of Plants Nitrate (NO3—N) and ammonium (NH4—N) are two major forms of inorganic nitrogen taken up by the plants. Most of the ammonium has to be incorporated into organic compounds in the plant roots, whereas nitrate is [...]
After reading this article you will learn about the role of phosphorus in relation to metabolic functions, nutrition and growth of plants. The role of phosphorus as a constituent of macro molecular structures is the most prominent in nucleic acids as units of DNA molecule which carry the genetic information and as units of RNA which are responsible for the [...]