Nitrogen deficiency: poor plant growth, light green leaves, small leaves, the first leaves of the lower yellowing or even fall off, and then gradually move up and throughout the whole plant; fewer pods, pod growth and development.
Phosphorus deficient: Leaves at the seedling stage are dark green, hard and dwarf; the lower leaves are yellow during the period of pods, and the upper leaves are small and slightly upward.
Potassium deficiency: In the early stage of bean growth, leaf margins appear slightly yellow, followed by leaf margins in the order, followed by yellowing between the veins, in order; leaf margins wither, with leaves growing, leaves turning to the outside, leaves slightly Hardened, slightly shorter capsules.
Calcium deficiency: The plants are short, with premature aging, the vegetative growth of the stem is slow; the lateral root tips are dead, showing nodules; the veins of the parietal lobe are pale green or yellow, the young leaves are curled, and the leaf edges turn yellow and lose their greenness. The tip and leaf margins died inward; the top buds of the plants were necrotic, but the old leaves were still green.
Magnesium deficiency: During the growth and development of kidney bean, the green color between the veins of the lower leaves gradually turns yellow, and further development occurs. In addition to the green leaves and leaf residues, the leaves are yellow and white.
Zinc deficiency: faded from the median lobe, and the veins are clearly visible compared to healthy leaves; along with the gradual fading of the veins, the margins of the leaves turn from yellow to brown; the internodes become shorter, clusters of leaflets at the stem, and plexiform, The leaves curl slightly to the outside and do not bloom.
Shed: plant growth point atrophy brown and dry. The newly formed leaf buds and petioles are shallow, hard and easy to fold; the upper leaves curl outwards and the leaf margins turn brown. When the upper leaf veins are carefully observed, there is atrophy and the apple skin appears lignified.
Iron deficiency: chlorosis between young leaves and veins, yellowish-white, and the whole leaves turn yellow and white when dry, but it does not show necrotic spots or death.
Deficiency of molybdenum: Poor growth of plants, young leaves chlorotic, leafy leaves between leaf margins and leaf veins yellow spots, leaf margins curled inwards, tip atrophy, often causing plants to flower without scarring.
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