This article throws light upon the three reactions by which phosphate fixation takes place in soils. The reactions are: 1. Adsorption 2. Isomorphous Replacement 3. Double Decomposition. Reaction # 1. Adsorption: Adsorption reactions may be classified into two types – (a) physical—phosphate held on the soil solid surface and (b) chemical adsorption—retained phosphate penetrates more or less uniformly into the [...]
After reading this article you will learn about:- 1. Distribution of Acid Soil 2. Classification of Acid Soils 3. Pedogenic Processes. Distribution of Acid Soil: Out of 157 million hectares of cultivable land in India, 49 million hectares of land are acidic, of which 26 million hectares of land having soil pH less than 5.6 (pH < 5.6) and the [...]
This article throws light upon the eight main phases in which the growth curve of bacteria is divided. The phases are: 1. 1. Initial Stationary 2. Accelerated Growth 3. Logarithmic Growth 4. Decreasing Growth Rate 5. Maximum Stationary 6. Increasing Death Rate 7. Logarithmic Death 8. Survival or Decreasing Growth Rate. Phase # 1. Initial Stationary: This phase is characterized [...]