Here is a compilation of notes on Soil Pollution. After reading these notes you will learn about: 1. Definition of Soil Pollution 2. Causes of Soil Pollution or Soil Degradation 3. Effects 4. Control. Note # 1. Definition of Soil Pollution: Soil is the thin layer of organic and inorganic materials that covers the Earth's rocky surface. The organic portion, [...]
After reading this article you will learn about the role of biofertilizers. Biofertilizer is a boon for farmers, because it helps in increasing soil fertility. Biofertilizer involves the preparation of efficient strains of micro-organisms capable of converting atmospheric nitrogen into nitrate or dissolving phosphorus from the fixed form. Biofertilizers include BGA, rhizobium, azospirillum and phosphate solubilizing microorganisms (PSM). Bluegreen algae, [...]
This article provides short notes on plant insecticides. There are some plants which contain chemical substances like alkaloids and inflavonoids which act as insecticides. Alkaloids such as nicotine from tobacco (Nicotinu spp), rotenone from Derris (Derris elliptica) and pyrethrins and cinerins (pyrethroids) from pyrethrum (chrysanthemum cinerariaefolium) are good plant insecticides. Most plant insecticides act as contact poisons being absorbed through [...]