Question

What issue might be present in the soil if the ration to Nitrogen (N), Phosphate (P)

and Potassium (K) are sufficient, but the leaves of a
plant are showing phosphate and potassium deficiency?

Answer 1

Low level of nitrogen in the soil.

Adding organic materials poor in mineral nitrogen to the soil, which encourages the subsistence of soil microorganisms on mineral nitrogen to break down these materials, and this causes a temporary reduction in the proportion of mineral nitrogen in the soil.

Soil drought.

Problems with root growth due to soil compression or disease.