1. Soil salt damage. Excessive use of nitrogen and phosphorus fertilizers, so that most of the fertilizers remain in the soil, resulting in increased soil salinity, the phenomenon of "whitening" and "redening" of the topsoil, causing root disorders, affecting crop growth, especially seedling, rigid, until death.
2. Soil acidification. The vegetable soil is in aeration condition, and the nitrogen fertilizer in the soil will be nitrified to form nitric acid, which will increase the acidity of the soil and become acidic soil. The vegetables are soils that prefer neutral or slightly acidic, especially vegetables such as spinach and lettuce are grown due to high acidity in the soil. Will be significantly inhibited.
3. Crop physiology is deficient. Partial application of nitrogen fertilizer causes nitrogen and potassium nutrient imbalance and lack of potassium. A large amount of nitrogen fertilizer can induce or aggravate the calcium deficiency of vegetables. High nitrogen also inhibits the absorption of trace elements of magnesium and boron by crops, causing symptoms of magnesium deficiency and boron deficiency in crops.
Self drilling Screw made of 410 stainless steel, high hardness (40 Rockwell C), steel process.
Drilling screw is also very strong hardness, compared to the ordinary screw up, not only to maintain the ability is good, the connection object effect is also very strong, for the performance of the screw, are generally does not need auxiliary processing, can be directly on the object directly drill a Kong Sue into objects, not just use rise very convenient, Also can greatly improve the efficiency of work. This kind of drilling screw can be said to be the first choice of workers in various fields.
So what is the use of drilling screws?
1 stainless steel plate, metal plate, galvanized steel plate, engineering installation.
2 metal curtain wall metal light compartment and other indoor and outdoor installation.
General Angle steel, channel steel, iron plate and other metal materials combined installation.
4, automobile, container, shipbuilding, refrigeration equipment and other assembly projects.
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