Can't be planted in paddy fields. Although watercress likes water, it can't be planted directly in water, because it needs oxygen for planting and growth, and the oxygen in water is not enough for watercress seeds. It is easy to cause seeds to be soaked without germination. \ x0d \ x0d \ watercress sowing methods can be divided into dry land seedling raising and semi-paddy field seedling raising. \x0d\\x0d\ For seedling raising in dry land, select the plot with fertile soil and suitable shade as the seedling field, plow, rake and prepare the soil, with the border width of 1.2m and the border soil fine and flat, and water should be used first, and then sow. Because the seeds are small, they must be mixed with 1-2 times fine soil. After sowing, cover with a thin layer of sieved fine soil. General sowing 100g, using 60m2 seedbed, can provide 1000- 1333m2 field seedlings. Irrigation every day, appropriate immersion irrigation, water on the border, appropriate to keep the soil moist, so as to avoid hardening. About 30 days after emergence, when the seedlings grow to 12- 15 cm, they can be transplanted into the field. \ x0d \ x0d \ Semi-paddy seedlings should be cultivated in paddy fields with low terrain and fertile soil. After irrigation and ploughing, the border surface with a width of 1.2m and the border ditch with a width of 35cm should be leveled, and the border surface should be fully wetted by irrigation, but there should be no water layer. Spread a layer of fine soil after sowing. When the seedlings grow to a height of 4-5 cm, irrigate to keep a thin layer of water on the border, and then gradually deepen the water layer to 1.5-2 cm with the growth of the seedlings. \x0d\\x0d\ cultivation techniques \x0d\ planting \ x0d \ x0d \ The Yangtze River valley was mostly planted in the middle of June 5438+10. Choose strong seedlings before planting, requiring thick stems, short internodes and complete green leaves. Because the stems of plants are semi-creeping, there is often a difference between yin and yang. When raising seedlings, the sunny side should be upward, and the two basal nodes should be planted obliquely with the root system to facilitate survival. Row spacing 15cm, hole spacing 10cm, 2-3 plants per hole. \x0d\\x0d\ Management \x0d\\x0d\ Soil preparation and base fertilizer application: Paddy fields with low terrain, convenient irrigation and drainage and fertile and loose soil can be selected for planting. Before planting, plow and harrow in shallow water area, and apply 3000kg of decomposed human excrement or 5000kg of manure as base fertilizer every 667m2 in combination with ploughing. After ploughing, rake it flat to keep the field muddy or a thin layer of shallow water, and then plant it. If it is planted in semi-dry land, the open field should be leveled after applying base fertilizer and watered to keep the soil moist. \ x0d \ x0d \ Water management: planting in semi-dry land, watering after planting. Weeds are easy to grow in the field in the early stage, so weeds should be removed in time, and then watered every 3-4 days/time. When planting paddy fields, the water layer of 1-2 cm should be maintained in the early stage, and then the water level will gradually deepen to 3-4 cm with the growth of plants, but not more than 5 cm to prevent rust roots. \x0d\\x0d\ Rational fertilization: watercress can be harvested 30-40 days after planting. Once harvested, 65,438+0 quick-acting fertilizer should be applied in time. Generally, 15kg urea or 0.5% urea solution is sprayed on the leaves of 667m2, or 1.200kg decomposed manure is applied every 667m2, diluted 5 times with water, and the fertilization time is chosen in the morning and evening. \x0d\\x0d\ harvesting \x0d\\x0d\ after planting, the plant can be harvested when the plant height is about 25cm. There are two harvesting methods; One is to pick out the buds one by one and then tie them up one by one. This method is labor intensive. The other is harvesting in the same mud, cutting off three quarters of the whole land at a time, stepping old roots into the mud, fertilizing and raking, and planting the remaining quarter of seedlings. This method is mostly used for large-scale cultivation. \x0d\\x0d\ seed retention \x0d\\x0d\ asexual propagation type: only seed retention plants can be selected for asexual propagation type varieties to protect seed retention in summer. The planting site should be selected in a place with cool ventilation and convenient irrigation and drainage, and it is best to have shade around it. If necessary, cover the sunshade net. Pests are prone to occur in summer and should be prevented in time. \x0d\\x0d\ fruiting type: flowering and fruiting varieties, reserved seeds. Generally, the Yangtze River basin germinates in mid-March, bears pods in early April and ripens pods in early May. In order to prevent the varieties from mixing with each other, the net should be covered before flowering to prevent cross-pollination between varieties. When harvesting seeds, it should be done in the morning and evening to prevent seeds from cracking and losing seeds. After the seeds are harvested, they should not be exposed to the sun to prevent the high temperature from affecting the germination rate of the seeds. Dry and threshed seeds are stored in a cool, dry and ventilated place.