Chlorinated fertilizers mainly refer to fertilizers containing chloride ions. In the production, potassium chloride (60% potassium oxide, 48% chlorine), ammonium chloride (25% nitrogen, 66.7% chlorine); ammonium chloride and potassium chloride are used as nitrogen. Chlorine-containing compound fertilizer for potassium raw materials also belongs to chlorinated fertilizer.
Rice is a crop with strong chlorine resistance. The price of ammonium chloride and potassium chloride is low. It is an ideal nitrogen and potassium fertilizer for rice fields. The paddy soil has sufficient water to dilute the chlorinated fertilizer with strong salt-producing ability. Chlorine is the most easily moved element. Chlorine is most likely to be lost or leaked in water without causing salt and chlorine damage. Therefore, chlorinated fertilizers should be used first in paddy fields. Generally, 40 to 50 kg of ammonium chloride and 5 to 10 kg of potassium chloride are applied per acre of rice fields. Apply it as a base fertilizer first, then plow it, then flatten it, then insert it.
Although irrigated crops are planted on irrigated land, irrigation water is guaranteed, and fertilizer and water can be combined. Application of chlorinated fertilizer combined with irrigation can reduce the damage to crops caused by excessive local fertilizer concentration. Can be used as a base fertilizer without seed fertilizer, fertilizer and seed spacing soil layer 8 cm. The topdressing is 8~10 cm from the root system and the soil is applied deeply.
For the application of chlorinated fertilizers in dry land without irrigation conditions, attention should be paid to the application rate and fertilization position to prevent burning and burning of seedlings. Can be used as a base fertilizer, top dressing, not seed fertilizer. Corn, wheat seeds and fertilizer compartments need 8 cm, soybeans and cotton need 10 to 11 cm. As long as the dosage is appropriate and used properly, the yield of ammonium chloride and urea is basically equal in the case of equal nitrogen; in the case of potassium, the yield of potassium chloride and potassium sulfate is basically the same. Generally, 5 to 10 kg of potassium chloride and 15 to 25 kg of chloro-compounded fertilizer with 15% of NPK content are applied per mu. Ammonium chloride is best used in rice fields and irrigated fields.
For safety reasons, it is not advisable to apply ammonium chloride and dichlorinated compound fertilizer with ammonium chloride and potassium chloride as raw materials. Spinach is a strong chlorine-tolerant crop. It can be applied with potassium chloride or chlorine-containing compound fertilizer. As long as it is not used excessively, the same yield increase effect as potassium sulfate can be obtained. Apply 3,000-4,000 kilograms of decomposed organic fertilizer per acre, and chlorinated compound fertilizer with 15% nitrogen, phosphorus and potassium content for 2~3 times, and then cooperate with topdressing potassium chloride for 5 kg per acre. The effect is good.
Try not to use potassium chloride with less than 60% potassium oxide in greenhouse vegetables. In addition, it is necessary to control the application amount of chlorinated fertilizer to prevent salt accumulation, especially the high chlorine content of ammonium chloride, the salt-producing ability is much higher than that of potassium chloride, and greenhouse vegetables are not suitable for application.
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