Normally, ZnSO4 is applied as foliar spray to the crop, but when it comes to nano-fertilizer, why ZnO is used instead of ZnSO4 as nano material? Since most plants can absorb ZnSO4 in the form of micro nutrient.
Nanoparticles slowly “deliver” the trace element to the plant cell and better adsorb the enzyme in the cell. Zinc ion of salt is more easily washed out of the soil by rain than nanoparticles. When dosed, ions are more toxic than nanoparticles.
As Dr. Mirgorod said, it can be due the different solubility of the zinc fertilizers.
Solubility of ZnO is very low in water compared to very high solubility of ZnSO4.
ZnO is used in acidic soil but ZnSO4 can be used in any soil and etc.
See the attached file
dear Salvadora Buhroy ;
it can be due to the toxicity of zinc dosage. the researcher observed that treatment of nano zinc at lower concentration (1,000 ppm) had positive effects on plant, but it showed toxicity symptoms at higher concentration (2,000 ppm) pointing out their meticulous use. Further, during field experiments, they reported usage of 15 times lower dose of ZnO nanoparticles compared to the recommended dose of ZnS04 and recorded 29.5 % higher pod yield.
for more details read the following reference page 91
Nano-fertilizers and Their Smart Delivery System
http://www.researchgate.net/publication/275769721
I cannot really contribute to this directly because my experience with ZnO is in physics and electronics. However, it does seem to be used in a diverse range of applications from electronics to medicine and now I learn in agriculture. It surely is a wonder compound.
Sulfate of potash, zinc and magnesium, all three contain sulfate! Does sulfate interfere with the effects of K, Mg and Zn ?
Thank you for ans. However, the form in which nutrients are applied to soils has always been regarded a key factor, influencing their availability. Mineral nutrients are usually taken up in the form of soluble salts, i.e., as cations or anions. Sulphate of potash, zinc and magsium are fairly water soluble, available to the plants as the nutrient released from sulphate salt in a relatively short period in exchangeable pool of the soil . What is your opinion?
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