First, nitrogen deficiency: plants are thin, branches are thin and hard, leaf floret is small, leaf color from the old leaves to the new leaves from the dark green and gradually faded, followed by a reddish purple, until the chlorosis off, when the whole plant loses green.
Control methods: Add fertilizer such as human fecal urine, cake fertilizer, manure or urea.
Second, the lack of phosphorus: leaves from dark green to copper color, leaf veins (especially petiole) was yellow with purple, flower bud formation difficulties, small and small flowering, and pale, resulting in poor fruit development, even withered and withered in advance.
Control methods: increase bone meal, fish meal, poultry fertilizer or calcium superphosphate, potassium chloride, generally with about 0.1% aqueous solution for extra-root fertilizer.
3. Potassium Deficiency: The plants are short and the stems are soft and easy to fall. The leaves often shrink. The old leaves appear dark brown spots along the leaf edges from the tip of the leaves, yellowing around the leaves, and the middle and veins are still green.
Control methods: increase the use of plant ash, 0.3% -0.5% potassium nitrate aqueous solution for extra-root fertilizer.
4. Calcium deficiency: The margins of young leaves are shriveled, leaf margins are curled up, white stripes are streaked, flowers are blocked, and new leaves are difficult to unfold or become distorted.
Control methods: In the first half of sowing or potting, apply proper amount of calcium chloride in the soil, to play the role of calcium increase and disinfection.
5. Magnesium deficiency: Plants do not thrive, and the old leaves from the bottom to the top gradually lose green from the leaf margin to the center, and there are spots on the veins. After the whole leaves turn yellow.
Control method: Use 0.2-0.4% calcium sulfate aqueous solution for continuous spraying 3-4 times, 7-10 days apart.
Sixth, iron deficiency: Yellow leaves from young leaves to old leaves.
Control methods: spraying with 0.3% ferrous sulfate aqueous solution, three consecutive times at intervals of one week.
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