potassium deficiency or salt burn

[mahen.jnk]

These are my one year old seed grown jackfruit plant leaves. Most of the leaves except very new leaves are becoming like this with edges turning brown. Is this potassium deficiency?

thanks
mj

[Guanabanus]

I believe the left leaf is typical of Potassium deficiency.  The right leaf may have that too, but it looks more like a touch of powdery mildew.

The yellow leaves on the ground look deficient in Nitrogen.

[mahen.jnk]

Thank you Guanabanus. I applied potassium sulphate today and see if any improvement in a week or 10 days.  The fallen leaves are not of this plant.

mj

[Guanabanus]

The damage on those leaves is permanent, until the leaves fall off.

Nitrogen can show results in a week or two, but most other fertilizer ingredients take longer.