1. It is not advisable to water immediately after using urea. Urea is a soluble fertilizer that is highly mobile and can easily cause loss. After applying urea in dry land, avoid watering immediately and should not be applied before heavy rain.
2. Ammonium bicarbonate should not be applied to the soil surface. The ammonium carbonate is highly volatile and easily causes burning. Therefore, ammonium bicarbonate should not be applied, it is best to open the hole for deep application and cover the soil after application.
3. Ammonium bicarbonate should not be applied in greenhouses and greenhouses. Ammonium bicarbonate is known as "gas fertilizer". It is applied in greenhouses and greenhouses and is easily decomposed into ammonia gas. 4. Ammonium nitride fertilizer should not be mixed with alkaline fertilizer. Ammonium nitrides such as ammonium bicarbonate, ammonium sulfate, ammonium nitrate, and ammonium phosphate encounter alkaline substances, which may cause loss of nitrogen. Do not volatilize with alkaline fertilizers such as grass ash, kiln ash and potassium fertilizer. It is mixed with lime nitrogen and the like.
5. Nitrate fertilizer should not be applied in rice fields. Nitrate ions dissociated from nitrate-based nitrogenous fertilizers such as ammonium carbonate are easily denitrified in the paddy field by water leaching to the deep layers of the soil, resulting in nitrogen loss.
6. Ammonium sulfate should not be applied for a long time. Ammonium sulfate is a physiological acid fertilizer that destroys the physical structure of the soil. Long-term application in alkaline soils also causes the soil to become stiff and stiff due to the reaction of sulfate ions with calcium in the soil.
7. Phosphate fertilizer should not be dispersed. Phosphorus has less mobility and is easily absorbed by the soil to reduce fertilizer efficiency. When applying phosphate fertilizer, the contact area between phosphate fertilizer and soil should be reduced. It is best to use ditch application or acupoint application to concentrate on the near root of the crop.
8. Potassium fertilizer should not be applied in the late stage of crops. Potassium has the characteristics of being able to be transferred from the stems and leaves of the crop to the delicate parts of the top, so potassium deficiency is later than that of nitrogen and phosphorus. Therefore, potassium fertilizer should be applied in advance in the early stage of crop production, or as a base fertilizer.
9, containing chlorinated fertilizers should not be applied alone for a long time, and avoid the application of chlorine crops. Long-term application of potassium chloride alone will increase the accumulation of chloride ions in the soil, causing the soil nutrient structure to destroy the acidification of the soil. Application on sugar-free crops such as sugar cane, sugar beet, watermelon, tobacco, etc., will reduce quality and quality.
10. Nitrogen-containing compound fertilizer should not be used in large quantities in legume crops. There are nitrogen-fixing rhizobium near the roots of soybeans, peanuts, mung beans, broad beans, peas, and alfalfa. If a large amount of nitrogen-containing compound fertilizer is applied, it not only causes waste of fertilizer, but also inhibits the activity of rhizobium and reduces its nitrogen fixation performance.
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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