a Mineral food. Basic elements

you are: a Mineral food

Without what the plant cannot finish the life cycle concern the cores, elements. Now we know that 16 elements are necessary for plants. From them. Four (With, N, About and N) occur finally from СО2, Н2О and N2 atmospheres whereas the others 12 (To, Sa, Mg, R, S, Fe, Si, Mn, Zn, Mo, In, С1) arrive in soil from parent breed. From these 12 elements absorbed from soil the last; seven are called as microcells as they are required to a plant in very small quantities; other five concern macrocells.

Modern representations about the mineral substances necessary for normal growth of a plant, are based mainly on experiments in which plants grow up on mineral solutions on a method named sometimes gidroponikoj. If in a solution there is no necessary quantity of the certain core, an element a plant suffers, at it the symptoms caused by its insufficient supply by this element develop. Skilled botanik can learn to distinguish symptoms of deficiency of each of elements at the given plant and to improve conditions of its cultivation by entering of corresponding elements into soil or a solution. More objective estimation of requirement of a plant in a mineral food is periodic cleaning of separate parts of a growing plant and their chemical analysis on the maintenance of various elements. Results of soil analyses also can be used as a rough reference point.

But such analyses usually do not show, in what measure the nutrients containing in soil, are accessible to plants. After the analysis of plants it is possible to bring any missing element that fast positive impact on growth and viability of a plant will make in Wednesday of cultivation.

One of the first mineral nutritious solutions prepared by German physiologist Knoppom for cultivation of the higher plants, contained only three salts: calcium nitrate, phosphate kalija and magnesium sulphate. Six elements, present at these three salts, together with assimilated in the course of photosynthesis With, N and About satisfy basic needs of the higher plants in a food. The form in which the main elements are presented to a plant, has rather small value: three kationa - To +, Sa2 + and Mg2 +-can be combined in any image with three anionami - NО3-, SO42 - and Н2РО4-. Besides, some plants can use ammonijnyj nitrogen (NH4 +) or organic forms N are not worse or even better, than nitrates though the majority of plants prefers nitratnye forms.

After in sale more and more pure mineral salts began to arrive, was found out that the basic solution of Knoppa containing three salts, actually is not full. Really, it has appeared that plants require and many other elements though their quantity should be much less, than quantity of six main elements. These microcells include iron (Fe2 + or Fe3 +), manganese (Мд2), zinc (Zn2 +), copper (Si2 OR Si +), molybdenum (usually in the form of Mo04-), a pine forest (in the form of В033-) and chlorine (With-). Some researchers assume that to plants, probably, very small quantities also some other elements, such, as cobalt (СО2 +), vanadium (usually in a kind VO43-) are required also. Strontium (Sr2 +) and iod (I-). However the absolute requirement of plants for these elements is not established yet. Besides, certain plants possess special requirements. For example, diatomovym silicon is necessary for formation of cellular walls for seaweed. As far as we know, silicon is not necessary to the majority of other plants, though a horsetail (Equiseturn) and many grain badly grow at its absence. Despite the fact that what silicon in general cannot be considered as a basic element, it, certainly, can favour to growth of plants. Similarly sodium though is not very necessary element, apparently, promotes achievement of big crops of some fleshy root crops, such, as a sugar beet.