very useful post found by sqweels in OMM old journal
Nutrient Deficiency Symptoms
N- Pale plants, red stems, smaller growth. Rapid yellowing of lower leaves progressing up the plant. Add any chemical fertilizer containing N. Treated plants recover in about a week
P- Slow or stunted growth, red stems. Smaller leaves that are dark green. Lower leaves yellow and die. Add chemical fertilizer containing P. Affected leaves will not show recovery but new growth will appear normal.
K- Affected plants are usually tallest and appear to be most vigorous. Necrotic spots form on lower leaves. Red Stems. Leaves appear pale of yellow. Add chemical fertilizer containing K.