Oenanthe javanica, also known as wild celery, is an aquatic vegetable that grows in ponds, rivers and paddy fields. It is delicious, has high nutritional value, contains a variety of trace elements and protein, and has the effects of lowering blood pressure, reducing blood lipid, clearing heat and diuresis. Because Oenanthes javanica is generally listed in stages from November to April of the following year, it is in the off-season when most vegetables are listed, and it is driven by the market on New Year's Day and Spring Festival, so its planting efficiency is good. In addition, autumn Oenanthe javanica has the characteristics of high yield, crisp flavor, good quality and long market period, so it is well received by vegetable farmers and citizens. Since 21, through experiments and demonstration planting, the cultivation techniques of autumn water dropwort have been explored and achieved success.
1. Site selection and soil preparation According to the growth habit of Oenanthe javanica, we should choose fields with low terrain, fertile soil and convenient irrigation and drainage, deeply plough and break the mature soil for many times, and combine with soil preparation, apply 15kg of organic fertilizer such as pig manure and 5kg of rapeseed cake every 667m2 (mu) in mid-July. The height of the ridge around the vegetable field is 12m (m). The surface of the field is 1 cm, and the soil layer within the depth requires the integration of fertilizer and soil, and the soil layer is fine and soft, so as to adapt to the root growth of Oenanthe javanica.
2. Seedlings of Oenanthe javanica are planted in proper time for asexual propagation, and the mother stems are cut, and then cultivated and planted in other places by taking advantage of the characteristics that long branches between the nodes of the mother stems produce adventitious roots. When the seedling height reaches 1cm, it can be transplanted into the field, and the appropriate transplanting period in the field is August 2 ~ 25, when the average daily temperature is stable at 25 ~ 3℃. Using 9 ~ 95 kg seedlings every 667m2, planting the vegetable seedlings evenly in the field in sunny evening or cloudy day, and keeping the field in a waterless state during transplanting, which is beneficial to the rooting of the vegetable seedlings.
3. 2 days after the field planting, it is necessary to timely sparse and replenish the water dropwort, manually root the water dropwort, so that the top of the water dropwort is highly consistent, and it will grow neatly in the future. In the field, a row with a width of 2 cm is reserved every 4m, which is convenient for field work.
4. Three days after the topdressing fertilizer Oenanthe javanica was planted, 3 ~ 4kg vegetable fertilizer was applied every 667m2 to meet the phosphorus demand of Oenanthe javanica at seedling stage; On the 7th to 1th day, 25 ~ 3kg of urea was applied to meet the needs of rapid growth of stems and branches. On the 3th day, 4 ~ 5kg cake fertilizer was applied as relay fertilizer to improve the quality of Oenanthe javanica.
5. Water slurry management A 3 cm water layer is established 3 days after the water cress is planted. After that, the field cannot be dehydrated, and water is added as the water cress grows taller, so that the top of the water cress is kept out of the water for about 1 minutes. However, when frost occurs or the temperature is lower than ℃, it is necessary to protect the seedlings in deep water and adjust the temperature with water so that the top of Oenanthe javanica is 3 cm above the water surface, so that Oenanthe javanica can safely overwinter and prolong the time to market.
6. Twenty days after the weed Oenanthe javanica was planted, it was the period of rapid growth of aquatic weeds. Therefore, manual weeding should be carried out in time and effectively to prevent weeds from competing with Oenanthe javanica for fertilizer.
7. Pests control During the growth period of Oenanthe javanica, aphids and Pieris rapae are the main pests. Generally, attention should be paid to insect detection and pest control before the end of September, and 3 ml of 25% Kuaishaling EC and 3 ~ 4kg of water should be used for control every 667m2.
8. Harvesting autumn celery takes a long time, usually starting from the middle and late November, and it can be harvested one after another until the early February of the following year, with a harvest period of about 7 days. The yield per 667m2 is about 5～55kg, with an output value of 7 yuan. Harvesting too early or too late will affect the yield and quality of Oenanthe javanica.