Kiwifruit has a healthy new leaf nitrogen content of 2.2%-2.8%. When the nitrogen content drops to 1.5%, it will show symptoms of nitrogen deficiency. Symptoms first manifest on the old leaves and then extend to the upper young leaves. The color of the leaves changed from dark green to light green and even completely yellow, but the veins remained green. The tip of the old leaf is scorching and extends along the leaf veins to the base. The necrotic tissue partially curls up, sometimes accompanied by a small fruit.
Control measures: Apply base fertilizers during colonization and every autumn and winter. From the end of May to July, topdressing twice nitrogen fertilizer, it is also possible to spray 0.3%-0.5% urea solution 2-3 times in the middle growth period, every 7 days. In addition, the cultivation of green manure is also a good way to supplement nitrogen.
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