One, cover package, should according to the weather changes in different periods, the growth of celery, strengthen the management of net. The whole canopy net of celery pre emergence after emergence, should see the light off sooner or later two nets, at noon when the sun is strong on the cover. The cloudy day can not be covered all day, but the net must be covered in time before the storm is coming.
Two, net width can be arbitrary cutting and splicing. The cutting method is to use the electric wire fever due to high fever after the cut, cut net can not be fused into road, loose. Splicing method is to use the nylon thread in a sewing machine or sewing by hand, do not use iron or aluminium wire bundle ligation, so as to avoid mechanical fracture, and influence the service life of the net.
Three, the surface coverage will cover directly on the ground or shade plants, usually at planting, after planting.
Four, small arch coverage will be covering in the arch arch shed on the film, suitable for shading and cooling, ventilation in summer and autumn or early spring night frost to use, can also be used in the rainy season rain or winter warming at night.
Five, support shed covered in the face of a shed to 0.5 ~ 1.8 meters flat or inclined, the net cover on the bracket, for shading and rain.
Six, covering the greenhouse covered with single net cover, omentum covering, covering outside the greenhouse and covering the greenhouse and so on. When the single net and omentum are covered, the two sides of the shed are not covered at about 1 meters in the air. The cover outside the shed is mostly used in the early spring and night heat preservation. The greenhouse cover, generally from 1 to 1.5 Mibugai.
Seven. The main purpose of covering 1. after the growth stage is to keep the soil moisture and prevent the soil from sowing after the heavy rain. Prevent insects and birds. Generally, the method is directly covered on the ground, but it is necessary to uncover the net in time after the emergence of the seedlings, so as to prevent the growth of the seedlings. After planting 2. short covering, one is the summer after planting cabbage, cauliflower, cabbage, celery, lettuce and other coverage, up to date on the cover of night survival, exposing, can be directly covered in crops; another is in the evening of early spring planting eggplant, melons beans cover cover to prevent frost.