To day I market many water soluble phosphatic Fertilizers available for spraying.
Definitely phosphorus can be apply as foliar, but fertilizer should be water soluble in grade like N:P:K and DAP. Regards
Yes, plant can take only phosphorous through root by diffusion. Root extension is also a noteworthy mechanism that plants have that can transport.
How it is possible to take phosphorus from water soluble Fertilizer by plant leaf?
There are 2 available form H2PO4- and HPO4-- which is taken by the plant root via the process of diffusion resulting from concentration gradient
Yes. There is a lot of old work using 32P showing P uptake through the leaves, but the quantity that can be applied is small relative to crop demand.
Yes, uptake of P through leaves is not significant. It is mostly uptake through root by diffusion
Plants take up nutrients via roots. The exception are foliar uptake of carbondioxide, oxygen and sulphurdioxide. Foliar uptake of other nutrients is limited.
Foliar application is more successful for micro-nutrients. Foliar applied 'P' cannot entirely replace soil applied P as early season P availability to roots in soil is important for crop growth. Some P uptake may occur through foliage. So it might be used as a type of top up application for high P demanding crops. If proportion of foliar applied P is more than soil applied P, there occurs a reduction in crop yields and P uptake by plant parts.
If phosphate could not be taken up through leaves how could glyphosate be taken up?
As @Sunita Gaind described in detail, the uptake of nutrients like phosphate is mostly possible through soil via root system of the plants. So, there remains some exceptions of foliar uptake, which needs to be investigated.
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