Inter- vs Intra-â. âInter-â and âintra-â are two prefixes which are commonly used in the English language. They sound similar, but when used with other words form words which are very different from each other. These two prefixes cannot be used in place of one another. One should be careful while using âinter-â and âintra-â as they can change the meaning of the word altogether. Prefix intra-Intra- means âwithinâ or âinside.â When used as a prefix with words, it means âwithin a group.â There are many words which are formed with the prefix intra- for example, intracompany, intranet, intramural football, etc. There are many medical terms which also use the prefix intra- for example, intravenous, intracranial, etc.
Phosphorus is one of the 16 essential nutrients that plants need for growth and reproduction. Phosphorus is considered one of the three major nutrients. They are termed major nutrients because of the relatively large amounts utilized by plants and the frequency with which their deficiencies limit plant growth.
Soil is a major source of nutrients needed by plants for growth. The three main nutrients are nitrogen (N), phosphorus (P) and potassium (K). Together they make up the trio known as NPK. Other important nutrients are calcium, magnesium and sulfur. Plants also need small quantities of iron, manganese, zinc, copper, boron and molybdenum, known as trace elements because only traces are needed by the plant. The role these nutrients play in plant growth is complex, and this document provides only a brief outline. Major elements Nitrogen (N) Nitrogen is a key element in plant growth. It is found in all plant cells, in plant proteins and hormones, and in chlorophyll. Atmospheric nitrogen is a source of soil nitrogen. Some plants such as legumes fix atmospheric nitrogen in their roots; otherwise fertiliser factories use nitrogen from the air to make ammonium sulfate, ammonium nitrate and urea.