a Mineral food. Organic substance of soil and growth of plants

you are: a Mineral food

If a plant to grow up in corresponding, favorable for photosynthesis, conditions in a solution containing optimum quantities of mineral substances it can successfully grow and develop up to maturing. From such experience it becomes clear that the green plant represents completely avtotrofnyj an organism concerning all organic substances necessary for it, including vitamins, hormones, amino acids and other various difficult molecules. Why then it is considered, what organic fertilizers render beneficial effect on plant growth?

It is necessary to search for the Answer not in the plant, and in the nature and soil structure.

The Soil which has arisen originally from fragments of parent breed, is vysokodinamichnoj and the complex environment for growth of plants. It includes:) particles of breed of the different sizes - from a coarse sand to small silt and very small parts of clay; organic substance, mainly the rests of the died off and decaying vegetative, animal and microbic cages; live organisms of different kinds, including bacteria, nitchatye mushrooms, seaweed, the elementary earthworms, insects and even larger animals; the soil solution containing inorganic and organic substances in a liquid phase, mostly in the form of the thin film surrounding particles of breed; the gas phase containing oxygen (it is necessary for breath of roots and active absorption of mineral substances by root cages), nitrogen, dioxide of carbon and an impurity of other gases from atmosphere.

Active growth of a plant depends on corresponding physical properties of soil. If soil particles are packed too densely the volume of a gas phase will be small, and absorption of mineral substances aerobno breathing roots will decrease because of lack О2. It is said that the soil is well processed, if it has enough komkovatuju structure, i.e. Such in which small soil particles, sticking together among themselves, form larger lumps. Friable packing of such lumps creates dense, but well aerated environment. It is that aspect of soil conditions which depends on organic components as soil granules stick together in lumps with the slime allocated with soil microorganisms, consuming organic substance. Thus, entering of organic fertilizers is necessary only when it is demanded by a physical condition of soil. In the conditions providing optimum growth of plants in completely inorganic environment, for example in well aerated quartz sand with entering of a solution of mineral salts, organic additives, as a rule, do not give an additional gain.

Fossils often contain set of the mineral connections liberated at decomposition of organic substances and used then plants. Though such mineral substances can be brought in soil directly in a solution, fossils thanking their slow and uniform decomposition are a source not only the basic mineral substances, but also microcells which often are absent in modern mineral fertilizers. Therefore entering of organic fertilizers into soil can be an expedient way of involving to circulation of organic substances. However there is no data, testifying that at entering of organic fertilizers into soil nutritious qualities of plants improve in comparison with the same qualities of the plants which have been grown up in well balanced mineral solution. it is necessary to remember it at discussion of impressive statements of defenders ' organic gardening '. Higher price for the vegetables which have been grown up with application of organic fertilizers, does not guarantee their best nutritional value though, probably, they contain much less pesticides, than other agricultural products.