All these metals are required as micronutrient in growth of plant. but main problem is as such metals are insoluble in water so how can we create a solubilized form of all these metals?
Firstly in your list P is not metal. Secondly plants do uptake elements but not in elemental form. Normally all the metals you referred are readily avilable as soluble salt and plants as micronutrients use these metal ions. Further the counter anion is important. Say it is better to use organic ion like citrate, acetate or tartrate as salt rather chloride or sulfate. But plants do require sulfate and chloride and other inorganic anions also.
Now if you keen to use metals as such then kindly note that metals in elemental form can not be assimilated by plants. However if you want to study the role of free metals on plants then try to use nano form of metals . These will be highly dispersed in water and in colloid form . So then use nanoscience to create dispersed metals. For P the elemental form is either white that catches fire with air and the other form is red which is not that reactive but this is also placed in the tips of match stick to create fire. Both forms are highly toxic to human. For P the universal form used is phosphate ion and it is used in DNA, ATP and everywhere. Be careful , trivalent phosphorous ion is very toxic.
The metals could be made water soluable with a chelating agent such as EDTA, or as mentioned citrate or tartrate salts of the metals. Phosphorus as suggested should be as Phosphate.
You could use sulphate, phosphate or acetate salts of the metals, they induce less osmotic pressure than chlorides etc. Commonly magnesium sulphate, Ferrous ammonium sulphate, Sodium phosphate and Cu-acetate/Cu-tartarate can be used.
Thank you all,
Let me clear that I am not doing any experiment.
I wanted to know
what if we use solubilized metals as such rather than Ionic form or Salt form???
Is it worth to made elemental/metal in solubilized form for agriculture purpose?
Elements can move across the cell membrane only in its ionic form. There are specific channel proteins for ions, which allows only the transport of specific element. There are various mechanisms and various types of protein channels for the transport of ions. if my information is correct, solubilized metals will only get adhered to the cell wall surface.
In any case, when you provide metals, they will react with various acids in soil to form salts or undergo displacement reaction with some other salts.
Moreover, "solubilizing" metals means making metal colloides, which is very much expensive when compared to the commonly used minerals for agriculture.
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