Ginseng fruit cultivation management taboo:
1. Avoid excessive temperature and low temperature When the temperature is higher than 38 °C or lower than 8 °C, ginseng fruit can not grow normally; below 0 °C, the whole plant will be frozen to death.
2. Avoid cultivating ginseng fruit in the sticky land. In the rainy season, especially in the years when there is too much rain, it is easy to rot, and the whole plant will die seriously.
3, avoid pesticides improper use of ginseng fruit is extremely sensitive to dimethoate pesticides, it is not appropriate to use it to control aphids and mites, otherwise it will cause dead plants or production.
4, avoid the timely removal of side buds ginseng fruit side buds are very easy to germination. This not only affects growth, but also causes physiological flowering and affects fruit setting. Therefore, in addition to the selection of staying branches, the remaining side buds should be removed in time.
5, avoid excessive humidity, too much humidity is likely to cause Phytophthora, so pay attention to the greenhouse ventilation, reduce humidity; rainy years, pay attention to timely spraying new high-fat film, carbendazim, chlorothalonil, etc. for prevention and treatment.
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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