Aquatic vegetables are more resistant to chemicals, and various herbicides that control weeds in rice fields are safer.
Aquatic vegetables mainly include alfalfa, alfalfa, rhododendron, citron, rhizome, and cress. Weeds in aquatic vegetable fields are different from weeds in dryland vegetable fields. In addition to some wet weeds such as calves in the past few years, there are mainly weeds, ragweed, sedge, melon grass, and eyes. Aquatic weeds such as vegetables, water sedge, and flat stalks are similar in species to rice field weeds.
Aquatic vegetables are more resistant to chemicals, and various herbicides that control weeds in rice fields are safer. Commonly used herbicides (before weeds are used):
1. 60% butachlor EC. 75-100 ml per acre, add 30 kg of water spray.
2. 12% oxacillin emulsifiable concentrate. Use 125-150 ml per acre and spray 3O kg of water.
3. 10% agricultural time WP can be 15 ~ 25 grams per acre, spray 25 kg of water, control broadleaf weeds and annual sedge weeds, the drug is very significant.
4. When mixed with acacia pesticides such as butachlor (amount of one-half to one-third of each), it can prevent almost all weeds in aquatic vegetable fields.
Note: The whole field requires flatness; the herbicide should be kept for 2 to 3 days in shallow water.
1. Correct selection of teeth
1) Before use, confirm whether the mechanical properties of the product meet the customer's requirements (such as the tensile strength of the Bolt and the safe load of the nut).
2) The length of the bolt should be selected properly, with 1-2 pitch exposed after tightening.
3) Before use, the thread should be kept clean.
2. How to use dental strips correctly
1) When tightening the teeth, pay attention to that the direction of force applied by the wrench should coincide with the axis of the screw, and do not tilt.
2) In the process of tightening, the force should not exceed the safety torque, and should be uniform. Try to use the torque wrench or socket.
3) Locking too fast will lead to locking, it is recommended not to use electric or pneumatic wrench.
4) Keep the thread clean. In order to ensure the smooth fit of screw and nut, it is recommended to put the product in a clean container and do not place it at will.
3. Standard of tooth bar maintenance
1) If there is slight damage to the removed tooth, screw and nut, the die and tap shall be used for repair.
2) The removed and repaired teeth, Screws and Nuts shall be maintained by means of oil bubble or lubricating oil, and shall be placed in order according to specifications, models and purposes.
4. Scrap standard
The bolts with obvious crack, broken thread, sliding, disorderly thread, screw tensile deformation, shear trace, etc. which can not be repaired by the on-site leader can be scrapped.
5. Specification parameters of tooth strips
Texture of material:
304/316
Product standard:
DIN975
Surface treatment:
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