Do you want to develop an organic product combining PSBs and triple superphosphate?? Any specific reason for any specific soil and  crop , you are looking at??

Dr. Srivastava give me reasons we produce organic product with decreasing  use of chemical fertilizers in agriculture....

A potential negative effect of phosphorus fertilizer in terms of response is its ability to induce issues with zinc deficiency. Another concern is that losses into water systems will contribute to eutrophication of water systems from algal fouling. Phosphorus is the most expensive of the major elements used in crop fertilizers and efficiency of the use is low. 

Plants need P and if the soil can provide very little there is no option but to add a source of P.  For impoverished soils, if P is removed in crops it must be replaced if cropping is to continue

thank you Dr.Mihan. what is your opinion in case of secondary metabolites production in plants? 

chemical fertilizers and pesticides use in farm cause adverse effect on secondary metabolites like decreasing plant defensive secondary metabolites.... is this effects can influence on human health ?

the main problem is antagonistic effects of a particular nutrient application, say P with Zn and Fe, also efficiency of P-fertilizer is too low so rather dumping of P i the adsorbed form within the soil (in particular for potato, where large amount of DAP applied without bothering about the target yield). we need to customize the dose as well have to developed fortified inorganic fertilizers or particularly put more emphasis on fortified organics, where combo of FYM, effluents, solid wastes, biofertilizers, cheaper sources of inorganics as zinc ash,, rock phosphates to be used in a customized fashion ie region and taget yield based. There addition of PGPs, sea weeds also are being tried.

The methods of balancedfertilization increases the apparent recovery efficiency as well reduced the dose of individual nutrients to a considerable extent.

agreed with Dr Anoop regarding combining PSB with rock phosphate or TSP kind of options

regards 

Not my field, but provided the supply is sufficient and not excessive,  why would the source -- mineral or organic --  have any appreciable effect on secondary metabolites unless the source affected the form (chemical species) taken up.  Plants have highly selective channels for ion uptake! 

The bulk of P in soils is generally in insoluble forms. To be available the status of the mycorrhizal communities can be determinant. Without mycorrhizal association the amount to optimize production can be 3 to 4 times that when mycorrhizal fungi are inoculated. This is particulary important when we live in a world which can experience peak P within the next generations. The ability to have optimized soil organic matter favors a diverse microflora which solubilizes the insoluble P. Organic P is both a source of food and habitat for the beneficial soil microflora but also is direct source of P for the crop plant. When organic materials are added along with mineral fertilizer show the use of organic and mineral give additive or synergistic result. When organic amendment is available the soil carbon material improves the water dynamics by increasing its capture and recycling. Since organic material can largely determine the water the mineral nutrition is dependent both on inorganic and organic status of the soil. Rather than seeing the nutrition of plants as being just inorganic or only seeing the effect of organic amendment there is value of using both approaches. In organic and organic amendment is additive under normal water conditions but under water scarcity the synergistic ability of combing inorganic and organic amendment is revealed. 

I am doubtful about the adverse effects of triple superphosphates, either on any of the soil properties or crop performance, considering most of the phosphorous diverting towards immobilized forms, either in acidic soils or on alkaline soils, phosphorous continues to remain under- supply.

agreed with dr anoop, overapplication of DAP in potato in western uttar pradesh is dumping phosphorus in the adsorbed form within the soil and we have to find out ways to make it release at a faster although 2% of it every season gets released, but application of PSB or other suitable means we can release this adsorbed component for thecrop growth

regards

This is happening  only in the absence of any monitoring system/ tools to evaluate do we we need to apply phosphate fertilizers on an annual basis regardless of any checks and balances for a given crop and for a given soil type..

Agreed Dr Anoop, i think most of the time P application amount is regardless of soil test or so and more dose in case of cash crops as potato, sugarcane. similar is true in most of the micro-nutrients in particular Zn, Fe and Mn.  we have take into account soil type, soil fertility status, crop/cropping system type, other inputs, target yield based, left overs within the soil system etc. regards

Dr Kalra, you have tossed up some good points . Phosphorous recommendation comes out without soil for P. And in the process, P application continues unabated and later it starts interfering with important nutrients like Fe, Mn , Zn etc

Chemical fertilizer produce tolering effect means require more dose every time to produce same effects. Overtime there effect is just like placebo effect. Placebo effects even found when any one use such chemical fertilizer without soil testing.

please read this paper : 

Nothing if you aplied in correct quantity