Nitrogen deficiency: poor plant growth, pale green leaves, small leaves, lower leaves first aging yellowing or even falling off, then gradually moving up, throughout the whole plant; less pods, pod growth and development.
Phosphorus deficiency: the leaves are dark green, hard and dwarf at the seedling stage; the lower leaves are yellowed during the pod-forming period, and the upper leaves are small and slightly upward.
Potassium deficiency: In the early growth of kidney bean, the leaf edge appears slightly yellow, in the order of the leaf edge, then the leaf vein yellowing, the order is obvious; the leaf edge is dead, as the leaf grows, the leaf curls to the outside, the leaf slightly Hardened, the pods are slightly shorter.
Calcium deficiency: plant dwarf, premature aging, slow growth of vegetative end; lateral root tip death, tumor-like protrusion; leaf veins of parietal leaves are light green or yellow, young leaves are curled, leaf margin turns yellow and green leaves The tip and leaf margin die inward; the top bud of the plant is necrotic, but the old leaf is still green.
Magnesium deficiency: During the growth and development of kidney beans, the green color between the leaves of the lower leaves gradually turns yellow and further develops. Except for the green leaves of the veins and leaf margins, the veins are yellow and white.
Zinc deficiency: Fading from the middle lobe, compared with healthy leaves, the veins are clearly visible; as the veins gradually fade, the leaves turn from yellow to brown; the internodes become shorter, the stems are clustered with small leaves, and the branches are clustered. The leaves are slightly curled to the outside without flowering and pods.
Lack of shed: the plant grows atrophy and becomes brown and dry. The newly formed leaf buds and petioles are shallow, hard and easy to fold; the upper leaves are curled to the outside, and the leaf margins are browned. When the upper veins are carefully observed, there is atrophy, and the apple epidermis appears lignified.
Iron deficiency: the leaves of young leaves are chlorotic, yellowish white. In severe cases, the whole leaves turn yellow and white, but they do not show necrotic spots and do not die.
Molybdenum deficiency: The growth potential of the plant is poor, the young leaves are chlorotic, the leaf flesh between the leaf margin and the veins is yellow-like, the leaf margin is curled to the inside, and the tip of the leaf is atrophied, often causing the plant to not bloom.
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