Generally, when nitrogen deficiency begins, the leaves in the growth stage gradually change from green to light green, and as the nitrogen deficiency increases, the leaves turn yellow, partially charred and slightly smaller than normal leaves. With the increase of nitrogen deficiency in young leaves, the leaves are greener. The petioles and calyces of the old leaves are reddish, with pale leaves or jagged, bright red. Poor soil and no normal fertilization, extensive management, weeds and susceptible to nitrogen deficiency. Control methods: Apply base fertilizer to meet the short and concentrated growth characteristics of the spring growth period. If nitrogen deficiency is found, apply 11.5 kg of ammonium nitrate or 8.5 kg of urea per acre and apply water immediately after application. Flowering can also be sprayed with 0.3%~0.5% urea solution of fertilizer 1-2 times, spraying fertilizer solution per acre 50 kg or 0.2% potassium dihydrogen phosphate solution 2~3 times.
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