Dead lotus seedlings may be caused by ammonium bicarbonate fertilizer

Huai'an Chuzhou District, Sanbao Township, Changchun, on June 26th, came to the telephone to report that there are 300 acres of shallow water in Putian, which applies 50 kg of ammonium bicarbonate per acre on June 17 and 50 kg of urea per acre on June 13th. Fertilizer 25 kg, 3% Phosphate granules 10 kg, 3 days after the last application of fertilizer, symptoms such as dead seedlings began to appear. The rate of diseased plants was 40%. The yellow leaves of the dead lotus plants were yellow and the stems were slender. not long. This field was planted with lotus root for 6 years. This situation did not occur in previous years. The first use of ammonium bicarbonate this year appeared dead. He asked whether the leaves of the lotus root were yellow and the death of the plant was not related to the quality of ammonium bicarbonate.

The reporter interviewed Professor Li Liangjun of the College of Horticulture and Plant Protection of Yangzhou University on related issues. According to his analysis, the above-mentioned Putian applied 50 kg of ammonium bicarbonate per acre on June 17th, applied 50 kg of urea per mu and 25 kg of compound fertilizer on June 13th. The fertilizer amount was too large, and it is estimated that the possibility of burning seedlings is relatively large. The use of 3% formazan granules per acre 10 kg should not cause a large number of dead seedlings.

Ammonium bicarbonate is highly volatile and can produce large amounts of ammonia at high temperatures, poisoning crops. Ammonium bicarbonate is relatively stable at temperatures below 15°C, with little loss of volatilization, and should not be used when the temperature is above 30°C to avoid burning seedlings. In general, Hetian should not be re-applied after June. On the one hand, the temperature is higher after entering June and it is easy to cause burning of seedlings after application. On the other hand, after the middle of June, the lotus roots enter the crusted stage and should be dominated by phosphorus and potash fertilizers. After the lotus root enters the harvest period, nitrogen fertilizer should be applied according to growing trend. If the plant grows well, nitrogen fertilizer may not be applied; if the plant growth is weak, nitrogen fertilizer may be applied in an appropriate amount, generally 10-15 kg of urea per acre.

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