1. Nitrogen deficiency symptoms
The leaves are small, light green to yellow-green, and the edges of the middle and lower leaflets fade to pale yellow, curling upwards, and falling off earlier. The plants are short, the stems are slender, the branches are few and they grow upright.
2. Phosphorus deficiency symptoms
The plants were small and thin. When they were severe, the tops stopped growing. The edges of the leaves, petioles, and lobules were somewhat shrunken. The lower leaves were rolled upwards, the leaf margins were scorch, and the old leaves fell off in advance. The tubers sometimes produced some embroidered brown spots.
3. The symptoms of potassium deficiency
The growth is slow, the internodes are short, the leaf area is reduced, the leaflets are arranged closely, form a small angle with the petiole, and the leaves are rough, wrinkled, and curled downward. The early leaves were dark green, yellowed later, and then turned brown. The leaf color changes gradually from the tip and edge to the whole leaf. The old leaves in the lower part are dry and fall, and the inside of the tube is blue.
4. Calcium deficiency symptoms
Light green stripes appear on the edges of young leaves and the leaves shrink. In severe cases, the apical bud died, and the lateral buds grew outward, showing clusters. Easily deformed to form a string of small tubers.
5. Magnesium deficiency symptoms
The tips and edges of the old leaves bleed green, spreading along the vein to the central part, and the lower leaves become brittle. In severe cases, the plants are short, the growth of roots and tubers is inhibited, the lower leaves are curled to the leaves, the leaves are thickened, and finally the chlorotic leaves turn brown and die off.
6. Sulfur deficiency symptoms
Slow growth, yellowing of the entire leaf, similar to nitrogen deficiency, but leaves do not fall off in advance. In extreme shortage, brown spots appear on the leaves.
7. Boron deficiency symptoms
The growth point and the tip of the branch died, internodes were short, lateral buds clustered, old leaves were roughened and thickened, leaf margins were curled, tubers were small, deformed, and brown or brown substances appeared inside.
8. Iron deficiency symptoms
The young leaves are slightly chlorogenic and regularly spread to the entire leaves, and then the chlorosis turns to pale yellow. In the case of severe iron deficiency, the shaded part is almost white, curled upwards, and the lower blade remains green.
9. Symptoms of manganese deficiency
The chlorosis between the leaves of the leaves may be light green, yellow, and red in different varieties. In severe cases, the veins almost become white. Symptoms begin with the new leaflets, and many small brown spots appear along the veins. Small spots are dead and fall off from the foliage, resulting in broken leaves.
10. Zinc deficiency symptoms
Plant growth is inhibited and the internodes are short. The top leaves upright and the leaves are small. There are gray to bronze irregular spots on the leaves, and the leaves curl upwards. When severe, brown spots appear on petioles and stems.
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