Bacterial fertilizers
People tried to apply preparations of living bacteria to the soil since the role of microorganisms in plant nutrition was clarified.
Traditional bacterial fertilizers include nitragin, azotobacterin, a preparation of silicate bacteria, phosphobacterin, an AMB drug, but the emergence of fundamentally new EM drugs( referred to in the section on soil) has become a real new word in this direction. However, the traditional bacterial fertilizers are not forgotten.
The main advantage of bacterial fertilizers is that they are environmentally friendly fertilizers: what gets there and what is there and what should be there is in the soil, only in a slightly larger amount. Even a very good mineral fertilizer does not guarantee the absence of harmful impurities in it, and many unwanted additives can accumulate in organic, since most of them contain plant residues that can be contaminated, for example, with heavy metals.
Nitragins are preparations of nodule bacteria living on the roots of leguminous plants. The very name says that their main "work" is to extract nitrogen. The difficulty lies in the fact that each legume plant has nodule bacteria, and these preparations were developed mainly for agricultural crops. The most acceptable for a flower bed of an open ground there will be a Lupian nitragin: it will feed not only lupines, but also all its neighbors.
Azotobacterin also contains nitrogen-fixing bacteria, but not nodule, and free-living, and therefore can be useful to any plant. It is especially effective on loose soils.
Silicate bacteria are able to release from complex compounds and convert potassium and phosphorus( and, at the same time, microelement aluminum) into potassium-accessible forms.
Phosphobacterin, as it is easy to guess by name, "specializes" in providing plants with phosphorus.
The name of the drug AMB stands for "autochthonous microflora B"."Auto( auto-) httonny" - the same as "aboriginal", that is permanently living in this place. Microflora, according to the old systematics, was called all microorganisms, considering that both bacteria and other live ultra-small-fiber refers to the vegetable kingdom. In other words, such a preparation contains a ready-made community of different bacteria, similar to that already living in the soil.
EM drugs in this sense are close to the AMB-drug, with the difference that instead of all indiscriminately potent soil bacteria, they include, you can say, their best representatives, even the elite.
The main disadvantage in using traditional bacterial fertilizers is that their portions are designed for large agricultural areas, so that even for a small country plot they are usually too large. What can we say about indoor flowers! But EM drugs of a new generation are more flexible in this sense.