Key points of protected cultivation and management of Zizania caduciflora in greenhouse at present

In the early spring of this year, the growth process of protected cultivation of Zizania caduciflora in greenhouse was 5-7 days later than usual due to the rare continuous rain and low temperature in history. It is necessary to seize the interval of sunny days to step up the field management of Zizania caduciflora cultivation in greenhouse facilities and speed up the healthy growth of Zizania caduciflora under greenhouse facilities. 1. The temperature rose quickly after the middle of March, and the plants of Zizania caduciflora grew rapidly in the shed. Delete the thin seedlings and leave 20-25 strong seedlings per pier before the end of March. When cutting seedlings, weeding can be combined with weeding in the field to improve the air permeability of the soil, and at the same time, the roots can be blocked by pressing mud in the rhizosphere of Zizania latifolia, so that the tillers can be dispersed and the nutritional status can be improved. 2. Strengthen the management of fertilizer and water. Under the premise of good application of base fertilizer and seedling fertilizer, strong stalk fertilizer was applied in time after seedlings were deleted and fixed at the beginning of April, generally applying imported compound fertilizer 30kg per mu. In late April, when 30% of the plants of Zizania latifolia were pregnant, Zizania latifolia fertilizer was skillfully applied according to the leaf color, and the imported compound fertilizer 20-30kg per mu was generally applied to ensure the nutrients needed after pregnancy and to ensure the fat and purity of Zizania latifolia meat. At present, the fields under protected cultivation of Zizania caduciflora should be irrigated with water, mainly irrigated with thin water from March to April, and a certain water layer should be established, which should not affect the pregnant Zizania latifolia frequently. After Zizania latifolia was pregnant in late April, the water layer was deepened to about 15 cm, and the quality of Zizania latifolia was improved by protecting it in deep water. 3. Prevent chemical fertilizers and pesticides from burning seedlings. After the plastic film is sealed in the greenhouse, carbon ammonia, urea or other volatile chemical fertilizers and any chemical herbicides are not allowed to be applied in the greenhouse. Only an appropriate amount of high-quality ternary compound fertilizer is allowed to prevent other chemical fertilizers and herbicides from burning seedlings. After applying high-quality ternary compound fertilizer, both ends of the greenhouse should be ventilated for more than 2-3 days. 4. Prevent seedlings from being damaged by high temperature. After the first ten days of March, the door membranes at both ends should be opened frequently for ventilation and seedling refinement, and the night when the low temperature comes, it still needs to be sealed and insulated. When the temperature reaches 17-18 °C on a sunny day, the temperature in the film has reached 32-33 °C. the door membranes at both ends of the greenhouse should be opened in time for ventilation, which is also beneficial to ventilation. When the temperature reaches 20 °C or above in a sunny day, part or all of the skirt should be removed in time, and the maximum temperature in the greenhouse should not exceed 35 °C to prevent high temperature burns. 5. Prevent the whole film from freezing too early. After late March, the temperature still changes violently, which is adjusted by the door membrane at both ends and the skirt on both sides. All the films can be removed after the middle of April all the year round, and the time of removing all the films in the years with frequent cold in late spring should be postponed appropriately. If you take off all the film prematurely, it will be damaged by cold air, and the production will be delayed.