The grid is typically designed with a unit size as the spacing, based on the site size. The spacing between the horizontal and vertical dividing lines represents the actual dimensions, usually 1 meter, 5 meters, or 10 meters. For example, at a crossroads point, the numbers on the grid are as follows: the top left corner number is the point number, and the top right corner is the difference between the design elevation and the current site elevation.
The bottom left corner represents the current site elevation, and the bottom right corner represents the design elevation. The value in the center of each square represents the amount of earthwork to be excavated/filled within that square (e.g., a 5m x 5m area). (This is usually accompanied by a plot number in Roman numerals or English letters). A "+" sign before the number indicates fill, and a "-" sign indicates excavation. If lines appear within a square, they indicate the boundary between excavation and fill within that plot.
Mesh netting cultivation is a practical and environmentally friendly agricultural technology that increases yields. By covering trellises with the netting to create an artificial barrier, pests are kept out, cutting off their (adult) breeding pathways. This effectively controls various pests, such as cabbage caterpillars, diamondback moths, aphids, flea beetles, beet armyworms, American serpentine leafminers, and cotton bollworms, and also prevents the spread of viral diseases.
Furthermore, the mesh netting allows light to pass through while providing moderate shading, creating favorable conditions for crop growth. This significantly reduces the use of chemical pesticides in vegetable fields, resulting in high-quality and hygienic crops. It provides a strong technical guarantee for the development of pollution-free green agricultural products. Mesh netting also provides protection against natural disasters such as storms and hail.
Square mesh is widely used in the propagation of original seeds for vegetables and rapeseed to isolate pollen introduction; it is also used as a barrier after tissue culture and virus elimination for potatoes and flowers; and in the production of pollution-free vegetables. It can also be used in tobacco seedling cultivation for pest and disease control. Currently, it is the preferred product for physical control of various crop and vegetable pests. This truly ensures that consumers can eat "safe vegetables" and contributes to my country's "vegetable basket project."