In the flower production process, the lack of nutrients caused by lack of nutrients is generally distributed into patches or spots, and the symptoms are only strong and weak but not spread. The common deficiency factors are: Deficiency of ammonia: Plants are short, small leaves are pale (less chlorophyll) or red, branches are few, flowers are few, grains are not full, and yield is low. Phosphorus deficiency: young shoots and roots grow slowly, leaves are small, branches are reduced, stems and leaves dark green to purple, flowers, fruits, seeds are reduced, flowering is delayed, yield is low, and resistance is weakened. Potassium Deficiency: The initial growth rate decreased, the old leaves lacked green, and the tip and the leaf margin first yellowed, which in turn led to the yellowing of the entire leaf. The stems are soft and easy to lodging, drought and cold resistance are poor; sulfur deficiency: the plants are short, the leaves are small, and they are easy to fall off. The formation of chlorophyll is affected and the leaves are yellow-green. Young leaves first show chlorosis of the veins. Calcium deficiency: The growing point of stems and roots and the young leaves first show symptoms, and the growing points wither and even die, which can lead to plant clusters. Yellow tips and leaf margins of plants, premature aging. Magnesium deficiency: Chlorophyll cannot be synthesized, the veins are still green and the veins turn yellow, sometimes purple. When severely deficient, necrotic brown spots are formed. Iron deficiency: The leaves are yellow and appear yellow (yellow leaf disease). Yellow or light yellow usually starts from the new leaf, and then gradually spreads downward. Manganese deficiency: leaf chlorosis between veins, necrotic spots, underdeveloped roots, leaves will appear yellow, growth points will die, generally showing with iron deficiency at the same time.
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