1. The watercress in the selected area has a fast growth, a strong tillering ability, and requires a large amount of fertilizer. It is recommended to select a low-irrigation field with rich organic matter and adequate fertility. The water and fertilizer can be used for irrigation. The flow of water can reduce the water temperature and the ground temperature and regulate the microclimate. 2, nursery seedlings planting watercress breeding seed propagation and seedling breeding two. Baise Sausage seeds sowing seedlings breeding, from August to September sowing in the dry land or paddy fields, 25-30 grams of seed sowing 13 square meters seedbed, 666.7 square meters can be planted Daejeon. Water two times a day after sowing and keep moist. When the seedlings are 3 cm high, they should be immersed in water and gradually deepened. Seedling height 15 cm can be planted. Guangzhou Western cuisine generally breeds with seedlings. Seedlings are planted in shallow water and kept in fields from April to September. The spacing is 410 cm. When the seedlings are 15-20 cm tall, they can be planted in Daejeon. The distance is 1015 cm and 3-4 plants per hole are planted. 3, field management generally do not apply or less top dressing, to maintain a 5 cm deep water layer. Base fertilizer uses cow dung and green manure. If the middle and lower leaves are dark red, it is the performance of lack of fertilizer. Harvest time is once per harvest, topdressing once, and mainly available nitrogen fertilizer. 4, harvesting seedlings can be harvested 35-40 days after harvest, big seedlings planted 20-30 days after harvest. During the whole growth period, high temperature was harvested more than 20 days, low temperature more than 30 days, a total of 4-5 times, until the next April. When harvesting, take a piece of mud to cut, wash and tie. 5. Seed-retaining (1) Seed-seeding method: Seed and flowering varieties, winter and spring flowering, and spring and summer seed collection. For example, in Baise, Guangxi, the seedlings will be planted in January each year, followed by flowering in March, and then in April and May. When you turn yellow, you will follow it. (2) Old stem seed retention method: In southern China, when the spring temperature rises above 25 degrees Celsius, it is no longer harvested. After the summer, only the old stems and roots of the base were preserved for planting. In-situ seedlings should be selected from well-drained and relatively cool plots. When the seedlings are reserved, they will be discharged to the field or in April they will be moved to dry lands with good soil structure, slightly elevated terrain, and cool, water sources. During the reseeding season, the temperature is high and it is rainy and there are many insect pests. It is necessary to cool down, prevent rain, and treat pests in time.
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