In the case of nitrogen deficiency in tomato deficiency, the plant grows slowly, the veins change from yellow-green to deep purple, the stem becomes hard, dark purple, and rich in fiber. Remedial measures found that nitrogen deficiency, timely use of urea, ammonium bicarbonate and other available nitrogen fertilizer or human excrement ditch, or sprayed with 0.3% ~ 0.5% urea solution foliar application.

In the absence of phosphorus in phosphorus-deficient tomato, the early leaf back is purple-red, the mesophyll tissue begins to be spotted, and then spreads to the whole leaf. The veins gradually turn purple, the leaves are finally purple-red, and the stems are slender and rich. Contains fiber. Remedial measures can be mixed with superphosphate and high-quality organic fertilizer in a ratio of 1:1, and then trenched in the vicinity of the root, can also be used 0.2% ~ 0.3% potassium dihydrogen phosphate solution or 0.5% superphosphate leaching leaf Spray.

In the absence of potassium in potassium deficiency, the leaflets of the old leaves are burning, the leaf margins are curled, the veins are chlorotic, the roots are poorly developed, the fruit development is obviously blocked, the fruit shape is not correct, the maturity is different, and the coloration is uneven. Remedial measures Add potash fertilizer and organic fertilizer, generally 10 to 15 kg of potassium sulfate or potassium chloride per mu, ditch on both sides of the plant; also use 0.2% to 0.3% potassium dihydrogen phosphate solution or 1% grass ash leachate Foliar application.

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