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Experts: For example, in the past few years, Tianjin Soil and Fertilizer Institute has conducted potash tests on various vegetables. The results show that under the conditions of application with phosphorus and potassium fertilizers, appropriate application of potassium chloride or potassium sulfate can increase vegetable yield by 10%-20. %, the appearance and color are obviously improved, the vitamin and sugar content are significantly improved, and the nitrate content of leafy vegetables is significantly reduced.
Which effect is better for potassium chloride and potassium sulfate?
Expert: Potassium chloride was applied continuously for 3 years, and no adverse effects were observed, but the effect of potassium sulfate was better. Therefore, it is best to apply potassium sulphate to vegetables. Potassium chloride can also be applied to the open vegetables with more rain or irrigation conditions.
Mr. Guo of Qingzhou, Shandong Province is a fertilizer distributor in the vegetable producing area. I want to know the amount of potassium fertilizer applied to vegetables. How to apply?
Expert: The application rate of potassium fertilizer in vegetables varies greatly. Generally, based on the application of organic fertilizer, the application of potassium sulfate or potassium chloride is 30-80 kg. Among them, vegetables in greenhouses are much higher than those in open fields. In the fertilization method, the potash fertilizers of melons and solanaceous vegetables are mainly base fertilizers, and they are applied in multiple times, while leafy vegetables and vegetables with shorter growth period are mainly used as base fertilizers. The base fertilizer is combined with the application of the soil, and the soil is applied after the top dressing or the melting.
Ms. Xie of Baoding, Hebei asked how to apply potassium fertilizer to cucumbers and tomatoes in greenhouses. Can all potassium fertilizer be used as a base fertilizer at one time?
Experts: Generally, when the first melon or the first fruit is sitting, the potassium fertilizer is applied with the nitrogen fertilizer for 4 to 7 times, and the potassium sulfate is applied for 8 to 12 kilograms per mu, of which the cucumber is less than the tomato. After the ditch is applied, the soil is covered or dissolved and then applied with water. Potassium base fertilizer and top dressing cannot be combined together for one-time application, because the divided application can make the soil sufficient for potassium supply during the whole growth period; and excessive potassium application can hinder the absorption of nutrients such as calcium, magnesium and ammonium nitrogen by crops. use.
Mr. Liu from Fengcheng, Liaoning asked how to apply potash fertilizer to fruit trees?
Expert: This question is very big and can only be discussed in principle. Most fruit trees apply 20-40 kg of potassium sulphate or potassium chloride per mu. The higher the total fruit yield, the higher the application rate; the southern and coastal areas are more potassium-depleted than other regions, and the application rate is larger. The application time is generally divided into 3 times. The application period of fruit expansion period is the most in May-June, followed by the base fertilizer in autumn, and less before germination or flowering in February-April. The late-maturing variety should be applied once more in July and August. The fertilization method is: digging 4 to 6 dip or pits of more than 30 cm deep along the canopy drip line, and covering with the organic fertilizer or nitrogen and phosphorus fertilizer.
Ms. Liao from Shaoguan, Guangdong asked, what is the special significance of citrus potash?
Expert: Potassium has the same effect on citrus as general fruit trees, which can increase yield and improve quality. The differences are as follows: 1. Citrus requires a large amount of fertilizer, which is 1 to 2 times that of common deciduous fruit trees; 2. Most of the citrus planting areas are acid soils, which are generally deficient in potassium; 3. In recent years, citrus production areas have experienced multiple occurrences of ice and snow. In disasters, potassium application is good for cold resistance and improves the storage stability of fruits.
Mr. Gu of Changzhi, Shanxi asked, can you use ternary compound fertilizer instead of potash fertilizer on fruit trees?
Expert: Of course, it is recommended to use 1.5 to 2 kg of general-purpose compound fertilizer for autumn application, 1 to 1.5 kg of high-nitrogen-phosphorus compound fertilizer before germination or flowering, and high nitrogen and potassium type during fruit expansion period. The compound fertilizer is about 2 kg.
Mr. Qi of Baoji, Shaanxi asked, is there any relationship between apple deficiency and fertilization?
Expert: It has a relationship. For example, a one-time over-use of potassium fertilizer, soil drought or water accumulation will affect the roots' absorption and utilization of soil calcium; long-term application of calcium fertilizers such as organic fertilizers and calcium phosphate will also cause potassium deficiency in fruit trees. In order to prevent and control apple calcium deficiency, in addition to the application of calcium fertilizer, it can also spray 0.3% to 0.5% amino acid calcium several times before the flowering period to bagging. (This issue of experts: Senior Consultant of Sinofert, Professor of China Agricultural University Wang Xingren)
How to apply potash to vegetables and fruit trees
What is the effect of potash on vegetables?
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