Non-tapping screws are machine Screw, the pieceworker to be fastened must be tapped with taps in the screw hole in advance to match the screw threads.
The difference between tooth screws and other screws depends on whether they can be used together with nuts. Tooth screws can be used with nuts. And relative to the screws of other teeth, there are self-tapping screws. The nut of this kind of screw has no bow teeth. As for the standard teeth and fine teeth are only different pitch, it is the nut of the machine screw
Hex Machine screw,pan machine screw,flat machine screw,truss machine screw,Hexagon socket screws Shenzhen Lanejoy Technology Co.,LTD , https://www.szbrassnuts.com
The first application of excessive nitrogen fertilizer can lead to a decline in the quality of the vegetables. Mainly in the increase of nitrogen fertilizer application, the content of vitamin C and soluble total sugar in vegetables will decrease significantly. Specifically, it is expressed in vegetables. For example, under high nitrogen conditions, the sugar acidity of the fruit is significantly decreased, the palatability is deteriorated, the quality is deteriorated, the soluble solids in the fruit are also decreased, and the fruit is mashed, making the tomato intolerant. Shipped. At the same time, excessive application of nitrogen fertilizer in vegetables will also significantly reduce nutrients such as magnesium in vegetables and their fruits.
Secondly, excessive application of nitrogen fertilizer can significantly increase the nitrate content in vegetables, and the nitrite ions reduced by humans after eating vegetables are harmful to the human body. Nitrite ion is a strong carcinogen and causes cancer after long-term consumption.
Huaxian Agricultural Technology Promotion Center Lu Shuguang
Excessive application of nitrogen fertilizer is harmful to vegetables
Nitrogen fertilizer is the main fertilizer in vegetable production. Rational application of nitrogen fertilizer can increase the yield of vegetables, but the application rate of nitrogen fertilizer on vegetables is limited. When it exceeds a certain amount, it will not only cause the yield and quality of vegetables to decline, but also Produce harmful substances.
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