Observe first that its leaves are yellow from the inside or yellow from the bottom
1. In the absence of nitrogen, the synthesis of proteins, nucleic acids, phospholipids and other substances is hindered, the plants grow short, the branches and tillers are few, the leaves are small and thin, and the flowers and fruits are few and easy to fall off; the nitrogen deficiency will also affect the synthesis of chlorophyll, so that Yellowing of branches and leaves, premature aging of leaves or even dry, resulting in reduced yield. Because of the large mobility of nitrogen in the plant, the nitrides in the old leaves can be transported to young tissues for reuse after being decomposed. Therefore, when the nitrogen deficiency occurs, the leaves turn yellow and gradually increase from the lower leaves. This is a significant symptom of nitrogen deficiency. Features. When there is too much nitrogen, the leaves are large and dark green, soft and scattered, and the plants are long. In addition, when nitrogen is too much, the sugar content in the plant is relatively insufficient, and the mechanical organization in the stem is underdeveloped, which can easily cause lodging and be attacked by pests and diseases.
2. Phosphorus depletion can affect cell division, reduce tillering branches, stagnate growth of young shoots and young leaves, slender stems and roots, plant dwarf, fallen flowers and fruit, delayed ripening; in the absence of phosphorus, protein synthesis declines and sugar transport is hindered. Therefore, the content of sugar in the vegetative organs is relatively increased, which is conducive to the formation of anthocyanins, so when the phosphorus is deficient, the leaves exhibit an abnormal dark green or purple color, which is a deficiency of phosphorus. Phosphorus is easy to move in the body and can also be reused. In the absence of phosphorus, most of the phosphorus in the old leaf can be transferred to the growing young tissue. Therefore, the symptoms of phosphorus deficiency first appear in the lower old leaves and gradually develop upwards. When there are too many phosphate fertilizers, small focal spots will appear on the leaves, which will be caused by calcium phosphate precipitation. Excessive phosphorus will also hinder the absorption of silicon by plants and cause rice susceptible diseases. Water-soluble phosphate can also be combined with zinc in the soil, reducing the effectiveness of zinc, so too much phosphorus can easily lead to zinc deficiency.
3. In the absence of potassium, the stems of the plants were weak and susceptible to lodging, drought resistance, cold resistance, leaf loss of water, protein, chlorophyll damage, and yellow leaf color gradually necrosis. Deficiency of potassium sometimes leads to leaf margin scorch and slow growth. Since the middle part of the leaf grows fast, the whole leaf will form a cup-like curve or shrink. Potassium is also an easily mobile element that can be reused, so the deficiency condition first appears in the lower old leaf.
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