Ms. Tian of Donggang City, Liaoning Province asked: In a small plot of rice field cultivation, only 12 kg of diammonium was applied per acre. As a result, the seedlings generally became yellow. What is the reason? What should I do?
Answer: The yellow seedlings are likely to be lack of fertilizers, especially caused by nitrogen deficiency. Nursery should use fertile soil and increase organic fertilizer. The amount of chemical fertilizer is also much higher than transplanting rice. However, the phosphorus fertilizer applied by Ms. Tian is barely enough, nitrogen is seriously insufficient, and potassium fertilizer is not used. Because there is no organic fertilizer, trace elements may also be lacking. It is recommended to apply 10 kg of urea per acre, or to increase the amount of ammonium sulfate, ammonium bicarbonate, and 5 to 10 kg of potassium sulfate. If there is a shortage of symptoms such as reduced seedling disease, spray zinc sulfate or multielement fertilizer according to the instructions.
Mr. Wu of Jiansanjiang Farm in Heilongjiang asked: Before the newly planted soybeans were planted, diammonium was applied. Now that diammonium is not used, how is this going? Is there fertilizer problem?
A: It is not a problem with fertilizers, but it is due to improper use of fertilizers. The newly-cultivated land has high soil fertility, and diammonium is enough. However, the soil fertility has been declining for many years, and light application of diammonium will result in shortage of nitrogen and potassium. It is suggested that diammonium can continue to be applied but nitrogen and potassium fertilizers must be added appropriately, and the defertilization should be prevented at the later stage.
Ms. Li of Nanyang City, Henan Province, asked: When choosing compound fertilizers, their solubility is highly valued, but they often overlook whether the nutrient ratio is the counterpart. What are the differences in the solubility of different chemical fertilizers?
A: In general, chemical fertilizers are soluble in water, so the fertilizer is faster, which is the characteristics and advantages of chemical fertilizers. Among them, nitrogen fertilizer is most easily dissolved, followed by potassium fertilizer. Phosphate fertilizer is further divided into water-soluble, weak acid-soluble and insoluble. The solubility of compound fertilizers depends on the composition of nitrogen, phosphorus, and potassium fertilizers, and the characteristics of processed materials. Generally, the higher the proportion of nitrogen and potassium, the easier it is to dissolve.
Ms. Guo from Wuhu City, Anhui Province asked: During tower transplanting, a high-tower granulated compound fertilizer was applied during transplanting. The ratio of N, P and K was 30:5:5. As a result, the lower leaves were all burned. Is this fake fertilizer?
A: It is not pseudo-fertilizer. Leaf burns are caused by inappropriate fertilizers. High tower melt granulation compound fertilizer has high urea content, good water-solubility, quick effect, but easy to burn seedlings. When used, be separated from the seedlings, or fully mixed with the soil, and timely open the shed ventilation, otherwise prone to ammonia poisoning, burn the lower leaves or flowers.
Mr. Lan from Dezhou City, Shandong Province asked: The cucumbers used in greenhouses are fertilized with general-purpose compound fertilizers. Fertilizers do not dissolve and the seedlings do not grow. How is this going to happen?
Answer: The fertilizer used is inappropriate. High-nitrogen-potassium compound fertilizers should be used. This fertilizer has good water-solubility, and the nutrient-distribution ratio is suitable for the nutritive characteristics and fertilization characteristics of the cucumber during the fruiting period. After the solubilization, the fertilizer can be applied with water and can be covered with soil.
Zhao County, Henan Province, Mr. Zhao asked: Solanum vegetables how to raise seedlings in winter?
Answer: The winter seedlings of eggplant vegetables should pay attention to the selection of a bed with good permeability, adequate base fertilizer and heat preservation, strong seedlings, and rapid growth are the basis for prevention of damping-off and damping-off. Can be used 30% badewin (soil bacteria elimination) 3 ~ 4 ml, add 3 liters of water, soak 1 square meters of bed soil, Phytophthora can be used 64% antivirus (Erosin) 120 ~ 170 grams, against 50 kilograms of water Prevention. Control of aphids available pyrethroid pesticides or acetamiprid. Roots and yellow seedlings are often due to excessive moisture, should pay attention to see the bed see wet, prevent waterlogging.
Mr. Zhang of Huainan County, Anhui Province asked: What is the effect of urea and ammonium nitrogen fertilizer?
A: Which of the two nitrogen fertilizers is better depends on whether you use it properly or not. The urea concentration is high and it is applied to the soil first under the action of microorganisms, and after 3 to 5 days it is converted into ammonium nitrogen. It is difficult for crops to absorb and use before conversion, and it is not easily maintained by soil. Therefore, the amount of urea can not be too large, do not immediately apply water after application, but can not flood irrigation. The ammonium nitrogen fertilizer is easy to volatilize and lose when it is applied in calcareous soil or when it is met with alkaline substances. Therefore, it is necessary to apply it deeply and cover the soil after application.
Mr. Zhou of Jingzhou City, Hubei Province: Why is calcium sulfate acidic? Can it be foliar fertilizer?
A: Calcium is a fast-acting phosphate fertilizer obtained by decomposing phosphate rock with sulfuric acid. The product contains a small amount of free acid and is therefore acidic. Because it is a water-soluble phosphate fertilizer, the free acid content of the product is strictly limited and can be used as foliar fertilizer. For example, spraying wheat, corn, rice, etc. 1% ~ 3% of calcium sulfate solution, cotton, tomato, cucumber, sweet potato, etc. spraying 0.5% of the calcium solution, can increase the crop yield and quality. Spraying time mainly in the late or before and after flowering.
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