Plant nutrition

Plant nutrients is a chemical element that is essential for growth and reproduction of plants and lazin called by Hara plants. Essential element is a term often used to identify nutrients (nutrient) plant. Normally, to become the essential nutrients, must match certain criteria. The main criterion is that the element should be required to complete the life cycle of plants. The second criterion is that the element can not be fully replaced by other elements as a nutrient. The third criterion is that all these elements plants need to grow and complete its life cycle. . 
Growth is essentially mrupakan added size and weight of dried plants that do not reverse bias. Prekembangan plant growth and possible only in case the number of builders plant cells. Thus it is necessary for plant growth berlansungnya materials cell development. Plant cells wake of hundreds of organic and inorganic compounds, but in general the average composition penusun plant cells in general are; Water about 75%, charcoal Hydrate 20%, Protein 2% 2% inorganic solids, and fats and other compounds senya 1% (Day Suseno, 1984). 
dAll plant constituent compounds, either directly as the building blocks such compounds or indirectly derived inorganic elements of plants obtained in the form of inorganic mineral ions sebahagian of which came from the parent material tanah.Komposisi mineral inorganic elements of plants can determined by ash analysis of plant tissue or spektro-fotometr derngan using atomic absorption. Aanalisa ash from the plant tissue will show the elemental composition of inorganic elements of plants Among these are: Kalimu (K), calcium (Ca), Magnesium (Mg), phosphorus (P), sulfur (S), Manganese (Mn), Iron ( Fe), sodium (Na), silicon (Si), Chlorine (Cl), aluminum (Al) and other elements which escape in gaseous form at Pengabuan is C, H, O and N