In the case of nitrogen, the recycling of nitrogen from dead to living plants is often the only source of nitrogen in the soil. To make plants grow faster, what you need to do is supply the elements that the plants need in readily available forms. That is the goal of fertilizer.Most fertilizers supply just nitrogen, phosphorus and potassium because the other chemicals are needed in much lower quantities and are generally available in most soils. Nitrogen, phosphorus and potassium availability is the big limit to growth.he most important are: 1  Carbon, hydrogen and oxygen-Available from air and water and therefore in plentiful supply. 2  Nitrogen, phosphorus, potassium (a.k.a. potash) - The three macronutrients and the three elements you find in most packaged fertilizers. 3  Sulfur, calcium, and magnesium-Secondary nutrients.
The term epithelium refers to layers of cells that line hollow organs and glands. It is also those cells that make up the outer surface of the body. Epithelial cells help to protect or enclose organs.
A simple columnar epithelium is a columnar epithelium that is uni-layered. In humans, a simple columnar epithelium lines most organs of the digestive tract including the stomach, small intestine, and large intestine.Simple ciliated columnar epithelia line the uterus.iliated columnar epithelium moves mucus and other substances via cilia and is found in the upper respiratory tract, the Fallopian tubes, the uterus, and the central part of the spinal cord .They are the primary target of infection for common cold viruses such as coronaviruses, influenza virus and rhinoviruses.