In addition to sufficient nitrogen, phosphorus and potassium fertilizers, grapes are also sensitive to nutrients such as boron and magnesium. Once they are lacking, they will affect quality and yield.
First, the symptoms of boron deficiency showed water-stained yellowish spots on the leaves of the grapes, and gradually became obvious with the growth of the leaves. The leaves shrunk, the leaves and veins faded, and the sunburned coke was burnt; the branches of the branches shortened. The top of the new shoot is dead; the corolla often does not fall off, it is brownish-brown, tubular, stamen attached or only one or two pieces are split; the fruit is poor, the small nucleus is round, and the fruit stem is slender. Remedial measures 1 per plant of borax 0.5-1 g; 2 foliar spray 0.1% boric acid or borax solution 2-3 times.
Second, the symptoms of magnesium deficiency showed brown blemishes between the leaves of the old leaves of the grapes; the upper leaves of the branches were water-stained, and then the necrotic tissue was formed, and the old leaves of the middle part fell off. Remedial measures 1 Acidic soil, strained with 1-2 g of magnesium sulfate; neutral soil, strained with magnesium sulfate 1 - 1.5 g; 2 foliar spray 2% - 3% magnesium sulfate solution 2-3 times, each time Interval 2-3 days.
First, the symptoms of boron deficiency showed water-stained yellowish spots on the leaves of the grapes, and gradually became obvious with the growth of the leaves. The leaves shrunk, the leaves and veins faded, and the sunburned coke was burnt; the branches of the branches shortened. The top of the new shoot is dead; the corolla often does not fall off, it is brownish-brown, tubular, stamen attached or only one or two pieces are split; the fruit is poor, the small nucleus is round, and the fruit stem is slender. Remedial measures 1 per plant of borax 0.5-1 g; 2 foliar spray 0.1% boric acid or borax solution 2-3 times.
Second, the symptoms of magnesium deficiency showed brown blemishes between the leaves of the old leaves of the grapes; the upper leaves of the branches were water-stained, and then the necrotic tissue was formed, and the old leaves of the middle part fell off. Remedial measures 1 Acidic soil, strained with 1-2 g of magnesium sulfate; neutral soil, strained with magnesium sulfate 1 - 1.5 g; 2 foliar spray 2% - 3% magnesium sulfate solution 2-3 times, each time Interval 2-3 days.
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