When there is insufficient fertilizer in the production or nutrients in the soil are in an unabsorbable state, there will be a deficiency of nutrients. The nitrogen deficiency at the seedling stage is not fast, the plants are thin and thin, and the leaves are small and thin, yellow-green or light green; Mid-term nitrogen deficiency, early yellowing of the lower leaves, small disk, vegetative organs grow significantly worse, causing premature plant failure. The two potassium-deficient plants grew slowly, the leaves turned yellow, and brown spots appeared on the leaves. These spots eventually dried up and fell into thin flakes, falling and falling in oil content. After the three-deficient boron cotyledon was opened, the growth point was damaged or died, or the axillary buds germinated to form plants. The growth was not normal, the plants were short, and the stems had brown hooks. After the formation of the disk, the stems supporting the disk lose their ability to follow the sun, and some have low heads, some heads are overturned, the lower leaves are hypertrophy, dark green, the upper leaves are small and curly, the leaves lose their greenness, and the veins are prominent.
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