If water spinach is harvested once, it can be harvested once when the plant height is 20 ~ 35 cm. If it is harvested for many times, it can be sown when the plant height is 12 ~ 15 cm, and the thinning seedlings can be marketed; When the plant height is 18 ~ 2 1 cm, it can be harvested for many times and put on the market. When the seedlings grow to a height of 33 cm, pick them for the first time 1, and leave two stem nodes for the first time 1, the second stem node for the second time, and the 1 stem from the stem base for the third time, so that the stem base can germinate again. In this way, the stems and vines picked in the future can remain strong. When picking, it is more appropriate to pinch it with your hands. If you use iron tools such as knives, it is easy to rust the blade. Generally, the yield of one harvest can reach 1500 kg, and the yield of multiple harvests can reach 5000 kg.
2. Tian Tuan management
Water spinach has a great demand for fertilizer and water. Besides applying sufficient base fertilizer, it also needs topdressing. When the seedlings grow to 5 ~ 7 cm, they should be watered and fertilized to promote the emergence of seedlings, and then watered frequently to keep the soil moist. After each picking, topdressing should be 1 ~ 2 times. Top dressing should be light before concentration, mainly nitrogen fertilizer, such as urea. During the growing period, intertillage should be done in time to weed, and intertillage is not needed after ridge sealing.
The principle of water spinach management is: apply more fertilizer and pick frequently. The main diseases and insect pests of water spinach are white rust, Pieris rapae and Spodoptera litura larvae. 20% methomyl 8000 times solution can control Pieris rapae and Spodoptera litura larvae; White rust can be controlled by 1: l: 200 bordeaux solution or 0.2 degree sulfur mixed solution, or 65% zineb 500 times solution, and sprayed every1day to control the disease development.
3. Soil preparation and sowing
Live broadcast is generally used in the north. Before sowing, deeply turn the soil, apply 2500 ~ 3000 kg of decomposed organic fertilizer or human excrement and urine 1500 ~ 2000 kg, plant ash 50 ~ 100 kg, and rake it evenly with the soil. Before sowing, the seeds should be treated, that is, soaked in warm water at 50 ~ 60℃ for 30 minutes, then soaked in clear water for 20 ~ 24 hours, fished out and washed, and then placed in an environment of about 25℃ to accelerate germination. Keep the seeds moist during germination, and wash them with clean water for 65,438+0 times every day before sowing. The amount of seeds used per mu is 6 ~ 10 kg. Sowing is generally close planting, with a row spacing of 33 cm, and then covered with soil. You can also use sowing or hole sowing.