Covering structure steel frame span is 8 meters, the length can be determined according to the land, usually about 50 meters, shoulder height of 1.8 meters, ridge height of 4 meters, skirt height of 0.4 meters, arch spacing of 0.8 meters, every 3 meters Lamination lines are fixed. The shed spans 7 meters, 0.5 meters from both sides of the greenhouse on the both sides of the shed, 2 meters from the large shed at the inner shed, 1 meter from the shed, shoulder height of 1.5 meters, ridge height of 3.5 meters, and arch spacing of 2 meters. No lamination line And skirts. In the interior shed, four small arches were constructed. The material was a solid 0.6-cm thick glass fiber rod. The height of the shed was 0.8 meters. The span was the same as that of the sampan surface. The arch spacing was 0.5 meters and the spacing between the sheds was 0.5 meters. Greenhouses, inner sheds and small arches are all made of plastic without dropping film, covered with small sheds and covered with non-woven fabrics, and covered with white mulch.
Cultivation points (1) selection of varieties. As early as March, the market price of the asparagus in greenhouses was 3 times higher than that in the later period, showing that the early maturation of the varieties is of utmost importance. At the same time, we must take into account the characteristics of strong disease resistance, thick stems, and high yield and high quality. Combined with many years of practice, we should choose California. Early birth. Before the film is covered, the shriveling stems and leaves and weeds in the field shall be removed, the cultivating soil shall be loosened and the basal fertilizer shall be applied, and water shall be properly watered in combination with the conditions so as to increase the utilization rate of the fertilizer. (2) Temperature and humidity control. According to the weather changes, the small arch shed film and non-woven fabrics were timely uncovered. Shed temperature is controlled between 20 and 30°C during the day and around 15°C during the night. The weather is cold or rain and snow are delayed in the morning and the film is covered in the afternoon. When the temperature of the shed exceeds 20°C, the small arch awning film and non-woven fabrics are opened for field management such as bamboo shoots and bamboo shoots. When the temperature of the shed exceeds 30°C, the shed membrane of the leeward surface of the shed must be properly ventilated, and the temperature should be covered before and after 4 pm. The multi-layer covering has a high Moisturizing ability and should be properly ventilated at noon to reduce the humidity of the small arch shelter and the soil and prevent the occurrence of diseases. (3) Water and fertilizer management. According to the drip irrigation under the soil moisture membrane, it is not possible to furrow, reduce the air humidity of the greenhouse as much as possible. Before the multi-layer covering, the germination fertilizer is applied. Generally, from late December to early January, 1,000 kg of organic fertilizer, 300 kg of ternary compound fertilizer, 15-20 kg of superphosphate, and appropriate amount of trace fertilizer are applied per acre. From late February to early March, the temperature rises. Asparagus sprouts and tender stems grow faster. A large number of new roots are formed. It requires sufficient nutrients, and 1,000 kg of organic fertilizer and 20 kg of urea can be applied per acre. (4) Control pests. The main diseases are stem blight and root rot. The use of azoxystrobin, iprodione, carbendazim and other drugs for irrigation or spraying has better control effect, and 40% diterpene trioctyl benzene can be used for stem blight. Acid wettable powder plus white latex adhesive coated stems. The main pests are night moths, aphids, and thrips, which are concentrated from March to May. The focus is on poison baits, yellow plates, insecticidal lamps, etc., with the use of trichlorfon, beta cypermethrin, and phoxim, etc. . (5) Shooting management. Asparagus multi-layered cultivation in winter and spring in greenhouses, early maturing varieties can be shot within 1 week, should pay attention to view, timely piercing the mulch, so that the shoots grow smoothly upwards, prevent sharp bamboo shoots bent. (6) Spring mother stalks. The retention of spring mother stalks is an important measure for the cultivation of asparagus in greenhouses. From late March to early April, each plant has 3 to 4 robust mother stalks with uniform distribution, no pests and diseases, and a stem diameter of about 1 cm. The number of mother stems is appropriately increased according to the growth period and cultivation density of asparagus. Apply fertilizer after the end of harvesting shoots for plant growth.
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