Nitrogen deficiency symptoms in tomatoes: Plant growth is slow, leaves are small, and upper leaves are smaller. Yellowing starts from the lower leaves and then expands to the upper leaves. The whole plant is shorter. Yellowing begins with the veins and then extends to the entire leaf. The old leaves were yellow-green at the beginning, and the whole plant was pale green in the later period. The leaves were small and thin, and the inflorescence was exposed, commonly known as "dew"; the veins changed from yellowish green to deep purple. Stems harden, dark purple, rich in fiber. Fewer fruit, premature fruit enlargement.

Prevention and control countermeasures: Apply nitrogen fertilizer, timely apply nitrogen fertilizer such as urea, ammonium bicarbonate or human fecal urine to open the trench, and apply nitrate nitrogen fertilizer at low temperature. Or you can use a dragon light leaf to grow 1000 times liquid foliar spray.

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