theory about organic fertilizers

Elements like nitrogen, sulphur and halogens are bonded covalently in the organic compounds. In order to detect them, these have to be converted into their ionic forms. This is done by fusing the organic compound with sodium metal. The ionic compounds formed during the fusion a..

Theories on Organic Evolution - The occurrence of evolution is undeniably established by the various types of evidences that are available today. However, how it has come about is explained by the several ideas that have been put forth from time to time. These ideas are known as..

The occurrence of evolution is undeniably established by the various types of evidences that are available today. However, how it has come about is explained by the several ideas that have been put forth from time to time. These ideas are known as 'theories on organic evolution'..

According to Lamarck, continuous use of a part results in it being well-developed and disuse of a part over a long period of time will result in its degeneration. For example, giraffes were forced to extend their necks and stretch their legs to reach higher vegetation over a period of tim..

The fertility of the topsoil can be restored by taking the following measures. a) Regular use of manures and fertilizers can replenish the minerals used by the crops. Green manuring can also be done. b) Crop rotation should be practiced c) New techniques of applying water benea..

Waldeyer is credited with the discovery of chromosomes in the year 1888 within the nucleus. He observed them as darkly stained bodies. However, it was the American William Sutton who noticed the similarities between the behaviour of the mendelian factors or genes and that of the chromosomes during ..

The Greek philosopher and mathematician of 6 t h century BC, Pythagoras proposed the idea that each organ in the body of an animal released some kind of vapour, and that the new individual is formed by the combination of vapours from different organs. Fig. 18.1 Pythago..

The farm yard manure or organic manure or bio fertilizers and inorganic fertilizers supply the necessary plant nutrients to the soil. Thus, application of such materials increases the nutrient value of the soi..

Chromosome Theory of Inheritance - In the year 1902, Boveri and Sutton proposed the idea of chromosome theory of inheritance which was subsequently confirmed by Morgan in the year 1933. According to this theory, the Mendelian factors which are now called as genes, are ..

In the year 1902, Boveri and Sutton proposed the idea of chromosome theory of inheritance which was subsequently confirmed by Morgan in the year 1933. According to this theory, the Mendelian factors which are now called as genes, are located on the chromosomes and it is th..