Differences in the application of potassium sulfate and potassium chloride2020-02-19 11:00
1. The application crops are different. Potassium chloride contains chloride ions. Application in ramie and cotton fields can increase yield and fiber quality; but chlorine-resistant crops that are particularly sensitive to chlorine, such as tea trees, tobacco, and ginger, will reduce the aroma and will also make the tobacco flammable. Worsening; chloride ion will reduce yield and quality to beet, potato, sweet potato, grape and other chlorine-resistant crops If these crops need potassium chloride, it is best to compost them with organic fertilizers and use them as base fertilizers, or apply them as early as possible. Potassium sulfate does not contain chlorine, and its scope of application is wider than that of potassium chloride. It is used for tobacco, sweet potato, sugarcane and other chlorine-resistant crops and cruciferous sulfur-loving crops, and the effect is better than potassium chloride.
2. The application of soil is different. For poorly drained and highly reducing paddy fields, as well as paddy fields that have applied a large amount of organic fertilizer that is not rotten, potassium sulfate should not be applied to prevent the reduction of sulfide to hydrogen sulfide and poison the crop root system. Therefore, this type of paddy field is suitable for applying potassium chloride, and potassium chloride is applied to the paddy field. The chloride ion is washed to the lower layer of the soil, which can avoid its adverse effect on the crop. In addition, chloride ion has a special inhibitory effect on M. nitrosans in the soil, which can reduce the nitrogen loss caused by the nitrification and denitrification of ammonium nitrogen fertilizer. In highly reducing paddy soils, the application of potassium chloride is much better than potassium sulfate. For sulfur-deficient soils, such as paddy fields and cold-soaked fields that are prone to floating mud after soaking rakes, potassium sulfate should be used.
3. Different application methods. In addition to basal fertilizer and topdressing, potassium sulfate can also be used as seed fertilizer and extra-root dressing. The base fertilizer is generally 10 ~ 12.5 kg per mu, the seed fertilizer is generally 1.5 ~ 2.5 kg per mu, and the foliar spray fertilizer concentration is preferably 0.5% ~ 2%; and potassium chloride can not be used as a base fertilizer or topdressing fertilizer. Seed fertilizer and extra-root dressing, because chloride ions can burn seeds and germinate young leaves and stems. The base fertilizer usually consumes 8-10 kilograms per mu, and the topdressing fertilizer usually uses 5 ~ 7.5 kilograms per mu.