First, nitrogen deficiency

The leaf color of the plant is yellow or even dry, the leaf is small, and the plant is thin. The stem is thin and broken, and the number of flowers is rare

Second, phosphorus deficiency

The leaf color is dark green and the growth is delayed. The veins of the lower leaves are yellowing, often purplish, especially on the petiole, and the leaves fall early. The flowers are small and few, the flower color is not good, and the fruit is poorly developed

Third, potassium deficiency

There are disease spots on the lower leaves, and withered parts often appear at the leaf tip and leaf edge. The yellowing part extends from the edge to the middle, then the edge part turns brown and shrinks downward, and finally the lower leaves and old leaves fall off

Fourth, magnesium deficiency

The lower leaves are yellowing, and withered spots often appear in the late stage. Yellowing occurs between the leaf veins, and the leaf veins are still green. The leaf edge bends upward or downward to form shrinkage. Withered spots often appear between the leaf veins in one day

Fifth, calcium deficiency

The tips and edges of young leaves are rotten, and the tips of young leaves often form hooks. The root system had died before the occurrence of the above disease. The terminal bud usually dies

Sixth, iron deficiency

The disease occurs in new leaves, with yellowing between leaf veins, and the leaf veins remain green. Disease spots do not often appear. In severe cases, the leaf edge and tip are dry, sometimes expand inward to form a large area, and only the large leaf veins remain green

Seventh, manganese deficiency

The disease occurs in new leaves. The disease spots usually appear and are distributed on the whole leaf surface. The very thin leaf veins remain green and form a fine network. The flowers are small and poorly colored