Microphos PSB
Microphos PSB contains the Phosphate solubilizing bacteria in a spore form, which ensures longer shelf life and better sustainability after application in soil.
Chemistry of Soil Phosphorus:
With the exception of Nitrogen no other element is as critical in the field of plant nutrition as Phosphorus is. Being the constituent of nucleic acids which form the genes and control all life process, phosphorus plays a very important role in plant life.
Additional Information
Phosphorus availability is largely governed by the pH of soil solution in which phosphate ions are found. In highly acidic solutions only the H2PO4 ions are present. If the pH increased; first the HPO4 ions and finally PO4 ions dominates.
At intermediate pH levels two of the phosphates ions may be present simultaneously. Thus in solutions at pH 6.0 both H2PO4 and PO4 ions are found. In general the H2PO4 ion is considered somewhat more available to plants than the HPO4 ion. In soils this relationship is made complicated by the presence or absence of other ions.
Precipitation by Fe, Al and Mn ions:
Soluble iron aluminum and manganese are usually found in strongly acid soils. Reactions with H2PO4 ions would immediately occur rendering the phosphorus insoluble and also unavailable for plant growth. The chemical reactions occurring between the soluble iron and aluminum and the H2PO4 ions probably result in the formation of so called hydroxyl-phosphates.
Fixation by hydrous oxides
H2PO4 ion reacts not only with the soluble iron, aluminum and manganese but also with insoluble hydrous oxides of these elements such as limonite and goethite. The compound formed as a result of fixation by iron and aluminum oxides is likely to be hydroxyl-phosphates just as in the case of chemical precipitation.
Fixation by silicate clays
Third means of fixation of phosphorus under moderately acid conditions involves silicate minerals such as kaolinite, montmorillonite and illite. Some workers visualize the fixation of phosphates by silicate minerals as a surface reaction between exposed OH groups on the mineral crystal and the H2PO4 ions.
Availability of phosphorus at high pH values
In alkaline soils phosphate precipitation is caused mostly by calcium compounds. Such soils are plentifully supplied with exchangeable calcium and in most cases with CaCO3. Available phosphates react with both Ca². ion and its carbonate. As an illustration let us assume that concentrated super phosphate is added to a calcareous soil.
Thus the problem of Phosphorus availability at a high pH is a serious problem.
Fixation of phosphates in calcareous soils
Phosphate ions can react with the soil phase calcium carbonate and precipitate on the surface of these particles.
How to minimize the Phosphorus fixation?
From the practical point of view the phosphorus utilization picture is not encouraging. The inefficient utilization of applied Phosphates by plants has been long known. The small amount of control that can be exerted over phosphate availability seems to be associated with liming, fertilizer placement (application near root surface along with organic matter to avoid direct contact with soil particles), and addition of organic matter and application of phosphate solubilizing cultures. Application of Phosphate solubilizing bacteria is the most recommended solution for increasing P availability to the crops. Further application of PSB also improves the soil chemical and physical properties.
Key Advantages of Microphos PSB
Microphos PSB contains the Phosphate solubilizing bacteria in a spore form, which ensures longer shelf life and better sustainability after application in soil.
Microphos PSB is a Dextrose based product, which means dextrose is used as a carrier, which acts as a emergency food for the sporulated bacteria immediately after the application of Microphos PSB in soil.
Microphos PSB can be applied through the drip irrigation systems. This ultimately saves the cost of application. Since Microphos PSB is in a very high concentration there is no need to activate the product before use, it can be applied immediately.
How Microphos PSB solubilizes the Phosphorus?
Microphos PSB when applied to the soil secretes organic acids, which in turn dissolves fixed phosphorus. This ensures reversing the reaction to make Phosphorus available to the roots.
Doses
Apply 1kg Microphos PSB per acre of crop through drip irrigation.
Apply 100 gm to 200 gm Microphos PSB as a seed dressing.
It is dextrose base product which is 100% water soluble.
Available Packing of Azolum
1 kg