Cause: Summer amaranth in the high temperature conditions of 30 ~ 35 ° C, plus air drying, will cause the tip of the leaves dry; when the temperature is high, sudden cold wind, it will make its tip yellow. Soil acidification causes that if a large amount of acid fertilizer such as human waste, cake fertilizer or ammonium sulfate is applied to the soil for a long time during the planting process, the soil will be acidified, resulting in a dry tip phenomenon of the leek. This phenomenon can also occur with frequent overdose of fertilizer. A large amount of ammonium bicarbonate or unfertilized farmyard manure will release a large amount of ammonia gas, which will also poison the leek and cause the tip of the leaf to dry. Deletion or excess of trace elements, such as calcium deficiency or boron deficiency, yellow leaves will be yellow, and the tip of the leaves will die.
Control method: cover the sunshade net in summer high temperature, reduce the temperature of vegetable field, control the suitable temperature between 12 and 24 °C; increase the application of compost, apply less acid fertilizer, the amount of fertilizer should not be too large; less or no application of ammonium bicarbonate, Organic fertilizer should be fully decomposed and then applied; balanced fertilization, pay attention to supplement various trace elements, rational application, spraying vegetable Zhuangshenling + new high-fat film to make vegetable seedlings flourish, stems are thick, leaves are thick, high yield and quality.
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