Cress is not cold and heat-resistant, and traditional production is carried out in autumn and winter and early spring. In spring and summer, the leaves and leaves of cultivated cress are easy to age and cannot be eaten. In recent years, we have carried out research on breeding of heat-resistant varieties of cress and supporting summer shade net covering cultivation techniques, and achieved summer cress cultivation and marketing, with good economic returns.
The selection of the variety was selected from the water-resistant vegetable variety Fuqin 1 of the Yangzhou University Aquatic Vegetable Research Laboratory and the Yixing Agriculture and Forestry Bureau.
Daejeon prepares to plant land with slightly acidic paddy soil with good drainage, thick silt layer, and strong water retention and fertility retention. Before the end of June, per acre Shi cooked cake fat 60 to 80 kg, decomposed organic fertilizer 3000 kg. The cultivators work as rakes, and are 1.5 to 2 meters wide. The width and depth of the sulcus are 30 centimeters. The fields are soft and rotten.
Pregerminating seedlings can be planted in two shades in summer, covering shade netting and cultivation of cress. The first seedlings are planted at the end of June, and they can be picked up directly from the mother stalks of the watercress without removing germination. After the old leaves and shoots are removed, they are washed and cut into small sections of 20 to 30 cm in length, spaced at 3 cm intervals. On the surface, generally 30 to 40 days can be listed. The second crop will be planted around August 10th and will need germination. At the end of July, the mother stalks of watercress will be pulled up and washed and tied into small bundles. They are loosely piled in a cool and ventilated place. The bottom of the pile is emptied with small twigs. The straw is covered with straw, and the water is poured once in the morning and in the evening to avoid overheating. Rotten species, turn every 2 to 3 days during germination. When the axillary bud on the mother stem is 2 to 3 cm long, it is removed and the mother stem is cut into small pieces of 20 to 30 cm in length, spaced at 3 cm intervals. Use 250-300 kg per acre. Choose cloudy or sunny evenings, and immediately cover the shade net.
Set up shading facilities Use greenhouse skeletons or erect shade shelters 1.2 to 1.5 meters high above the plots. Cover with black shading nets with a shading rate of 65% to 80%. Spray cool water on the shade net at noon on sunny days. During the cultivation, the sunshade net is best to cover at night.
The water layer management fills the ditch water from the row seeding to the rooting of the watercress seedlings and leaves the roots to keep the surface moist and moist. When the cress seedlings are rooted, the fields are drained for 1 to 2 days until the silkworm-like cracks appear on the surface. After that, 3 to 5 cm of shallow water is maintained, and the water layer is gradually deepened to 15 cm when the plants reach 20 cm. Water management should be done daily night irrigation, it is best to change the water at noon every day or with cold well water irrigation. Especially in high-temperature and high-light conditions, the water layer should be deepened during the day, leaving only the leaves floating on the water surface and changing into shallow water at night.
10 to 15 days after fertilization and seedlings, 3 or 4 leaves of cress seedlings are applied for the first time, 1500 to 2000 kg of organic fertilizer per acre, and 20 kg of ternary compound fertilizer; and the second fertilizer is applied 10 days later. , 3-5 tons of urea per acre dissolved in 1000 to 1500 kilograms of decomposed human livestock urine poured into. Dry the field water before fertilization, and restore the water layer the next day after fertilization to avoid pouring the feces onto the foliage. After fertilizing, it is best to spray the plants with water. Can not be partial nitrogen fertilizer, waterproof celery quality deterioration.
The occurrence of pests and diseases in summer is very light and generally does not require medication. If locust occurs, submerge the plant in deep water for 1 to 2 hours.
Harvesting of the watercress at a time of 30 to 40 centimeters is timely and harvesting is completed at about one week, otherwise it is easy to be aged. Planting in larger areas should be listed in batches and listed in stages.
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