After May, the rain will increase, and sugar cane will enter the elongation stage of jointing. The demand for fertilizer is very large. The lack of fertilizer during this period will affect the growth of sugarcane, which will have the greatest impact on the yield. Therefore, in early May-June, it is a critical period for sugarcane topdressing. Most of the topdressing fertilizers are to be applied during this period. The technical measures are as follows: 1. Top dressing amount: (1) The general yield of the mountainous area is between 3-4 tons, the application amount is pure N 5.5-6 kg (equivalent to 10-13 kg of urea), pure K 5-6 kg (equivalent to Potassium chloride 8-10 kilograms; (2) Fields with high yields (5-6 tons of yield) such as flat land (replanting in paddy fields) are pure N 7-8.5 kg (equivalent to 15-18 kg of urea). K 7-8 kg (equivalent to 10-13 kg of potassium chloride); (3) High-yield fields with a yield of over 7 tons per mu, Mushi pure N 10-11 kg (equivalent to 20-25 kg of urea), pure K 10- 11 kg (equivalent to 16-20 kg of potassium chloride). P fertilizer is generally used as a base fertilizer, and top dressing is only supplemented when the base fertilizer is insufficient. 2, fertilization methods: Fertilization is generally carried out after the rain or when the soil is wet, applying topdressing in combination with large soil, can reduce the workload and improve ergonomics. After removing the weeds first, apply the evenly mixed fertilizer strip (or spot) to a 10 cm section of cane to cover with thick soil. 3. Fertilizer should pay attention to: (1) It is forbidden to apply fertilizer on the cane to prevent sprouting of the base of the cane seedling from affecting budding sprouts in the next year. (2) Do not apply fertilizer before heavy rain so as not to take away fertilizer from rain. (3) The soil is not fertilized when it is dry, so as not to reduce the drought resistance of sugar cane. If ammonium bicarbonate is used, generally 1 kg of urea is equivalent to 2.5-2.6 kg of ammonium bicarbonate.
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