First, leave the choice of farming. Farmers often choose to keep good plants in their lettuce, but they should pay attention to the conditions. Asparagus lettuce plants are often susceptible to heavy winds, rain, and turbidity, resulting in reduced yields. Therefore, as far as possible, the remaining planting sites must be sheltered and have a good condition and are not fertile. Although lettuce is a self-pollinated crop, its out-cross rate is also about 1%. It is necessary to pay attention to isolation from other species and adopt natural distance isolation and time isolation. The natural isolation distance is 100-300 meters, and the time isolation is staggered by more than 30 days of flowering.
Second, excellent single plant selection. Field selection is made when winter winter spring meat lettuce meets the commodity harvesting criteria. Select plants with typical characteristics of this variety, late bolting, close internodes, no lateral branches, few leaves, thick bamboo shoots without cracking, and no pests and diseases. Unselected plants are harvested and marketed. Mark the strains and number them separately.
Third, strengthen field training. Remove the remaining leaves and dead leaves of the selected plant strains and cultivate the soil. Open the ditch and ditch, and pay attention to often clear the drainage ditch, prevent clogging, to prevent the field of waterlogging. In order to prevent lodging caused by wind and heavy rain, it is best to insert a stand. Late-stage lettuce is prone to diseases such as downy mildew and aphids, and it is necessary to do a good job of prevention and control. Prevention of downy mildew can be used 25% metalaxyl 400-500 times spray, beginning in the beginning of the disease, every 7-10 days, a total of 2-3 times spray; control of aphids can be used 10% scorpion net (also known as imidacloprid , great hero, Kang Fuduo, once again net) 2500-3000 times liquid prevention.
Fourth, timely harvest. Around June, when the corolla was brown, and the white hair was spit out in the inflorescence, the seeds were basically mature and should be harvested in time. Otherwise, the white crowned hair on the seeds could easily be blown away by the wind and take away seeds or rain and rotten species. In view of the large difference in maturation of inflorescence at different parts of the lettuce, the entire plant should be harvested in stages or matured after most of the inflorescences mature, and then dried.
ETR Oxygen Cylinder Filling System
By PSA principles, ETR PSA oxygen generators generate 93%±2% purity oxygen gas directly from compressed air. ETR oxygen cylinder filling plant is consisted of Atlas Copco air compressor, Parker dryer and filters, air buffer tank, ETR Psa Oxygen Generator, oxygen buffer tank, oxygen receiver tank, diaphragm oxygen booster, filling station and control cabinet.
Compressed air is purified through the air dryer and filters to a certain level for main generator to work with. Air buffer is incorporated for smooth supply of compressed air thus to reduce fluctuation of compressed air source. The generator produces oxygen with PSA (pressure swing adsorption) technology, which is a time proven oxygen generation method. Oxygen of desired purity at 93%±2% is delivered to oxygen buffer tank for smooth supply of product gas. Oxygen in buffer tank is maintained at 4bar pressure, then reach to 150bar to filling cylinders with an oxygen booster.
Oxygen Cylinder Filling System
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