What kind of fertilization method is used for crops is a key issue for improving fertilizer utilization and increasing crop yield. Improper fertilization will not only cause waste, but also reduce fertilizer efficiency and reduce profits. Therefore, scientific and rational fertilization is an effective measure to improve fertilization efficiency and increase crop yield.
Organic manure and chemical fertilizer combined with organic fertilizers have full nutrient and long-lasting effects. Chemical fertilizers have a single nutrient, but the content is high and the effect is quick. The combination of the two can complement each other and improve fertilizer efficiency. According to the test, the livestock manure was combined with ammonium bicarbonate, superphosphate and potassium sulfate, which increased the yield by more than 11.5%.
Rational application of nitrogen, phosphorus and potassium micro-fertilizers is the formula fertilization. It is based on factors such as the fertilization performance of different soils, the fertilizer requirement of crops and the utilization rate of fertilizers. The earth increases fertilizer utilization and increases crop yields. According to the test, the utilization rates of urea, superphosphate and potassium chloride were 32%, 13% and 33%, respectively, and the utilization rate of formula fertilization would increase to 58%, 35% and 59% respectively.
Nitrogen fertilizer, deep application of soil, urea, ammonium bicarbonate and other nitrogen fertilizers shallow application, application or application concentration is too high, should cause serious waste of fertilizer. According to the test, urea and ammonium bicarbonate are more than twice as effective as fertilizer. Urea is an amide nitrogen fertilizer. When nitrogen is applied to the soil, a small amount is directly absorbed and utilized by plants. Most of the nitrogen is secreted by the microorganisms and converted into ammonium nitrogen to be absorbed and utilized by plants. The nature of ammonium bicarbonate is unstable, and the utilization rate of shallow surface application is low. At the same time, the nitrogen fertilizer has a large amount of topdressing and the concentration is too high, and the ammonia gas volatilized will smother the stems and leaves of the crop and cause fat damage. The correct method of fertilization is: the application of nitrogen fertilizer should be applied by ditching or hole application, the depth is about 10 cm, and the soil is covered after application. The application of leaf fertilizer should be well controlled. Wheat, cotton, corn, etc. are preferably 1% to 2%. The spraying concentration of vegetables should be low.
Centralized application such as phosphate fertilizer has poor mobility in the soil, and is easily fixed by iron, aluminum and calcium in the soil and loses fertilizer efficiency. Therefore, it should be applied to the acupoints. Concentrated on the soil layer of root growth, so that phosphorus is fixed around the seeds and roots, which is beneficial to root absorption and improve fertilizer utilization.
The limited application of fertilizers to medium and low fields is preferred. In corn high-yield fields, middle-yield fields and low-yield fields, the same effect of adding 10 kg of urea and 10 kg of potassium chloride to produce different yields is different: an average of 1 kg of urea per plant is added. Tianzeng produces 2.8 kg of corn, medium-yield fields increase 5.1 kg, and low-yield fields increase 7.8 kg; on average, 1 kg of potassium chloride is added, high-yield fields increase yield of 2.3 kg of corn, and middle-aged fields increase yield of corn 4.2. In kilograms, low-yielding fields increased corn yield by 6.7 kg. Potassium fertilizer single application of potassium sulfate, potassium chloride are water-soluble quick-acting potassium fertilizer, there is a weak physiological acid reaction. After being applied to the soil, the potassium ions are replaced by the cations of the soil colloid and then fixed, and the crop is difficult to use. The correct application method is: Potassium fertilizer can only exert a large effect when mixed with nitrogen and phosphate fertilizers. It is advisable to apply the concentrated ditch or the hole to the root system.
The combination of zinc fertilizer and phosphate fertilizer has serious "antagonism" between zinc and phosphorus. For example, the combination of zinc sulfate and superphosphate can inhibit the effectiveness of zinc sulfate to a large extent. The correct method of application is: zinc fertilizer and phosphate fertilizer should be used separately. Phosphate fertilizer is used as base fertilizer and zinc fertilizer is used as top dressing. Or zinc fertilizer as base fertilizer and phosphate fertilizer as top dressing, which can not only improve the fertilizer efficiency of phosphorus, but also improve the fertilizer efficiency of zinc fertilizer.
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Hydraulic Notching Machine for Angles
This machine is used for notching corner of angle steel in the tower industry.
This machine is used specially for cutting down angle bars in certain angle as wanted, it can also punch and mark with suitable dies.
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| Times of stroke(times/minute) | 20~25 | 15~20 |
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| Maximum Angle bar size(mm) | 140x140x12 | 200x200x20 |
Metal Notcher,Angle Notching Machine,Cnc Notching Machine,Angle Cutting And Punching Machine
Shandong EN FIN CNC Machinery Co., Ltd , https://www.sdfincncmachine.com