The cool weather is very beneficial to spinach growth. The accumulative temperature of spinach is 10°C～20°C, and it can withstand low temperatures below 0°C for a long time, but it is not heat-resistant, and it grows poorly above 25°C. Winter sowing, because of long-term growth in short days, no twitching, can grow into larger plants. Overwintering spinach is the main vegetable in early spring. It not only has high yield, but also has an early supply and high yield. Meticulous site preparation. This is the key to maintaining seedlings from winter spinach. Choose a land with flat terrain and convenient drainage. Before the end of August, pick up the dumplings immediately after the harvest, carefully prepare the soil, apply 4,000 kg of organic fertilizer per acre, use a planer several times, break the soil, mix the manure, and do 1 to 1.2 meters wide and flat, flat surface, ready for sowing. Timely sowing. The requirements for sowing date are very strict for winter spinach, and the suitable sowing period is between August 25 and September 5 from Liqiu to Bailu. Seeding early overwintering seedlings grow large, outer leaf aging, cold resistance is weak, sowing the seedlings over the winter is small, the spring of the second year of rapid convulsions, while the seedlings are not cold, not wind, drought, easy to dry and dead. Spinach seeds should be soaked in lukewarm water for 12 to 24 hours before sowing, and then the mucus on the seeds should be washed away. Before sowing, if it is poor, you should pour a little water. Seeding methods are mostly drilled and should not be broadcast. Each split 5 to 6 trenches, about 6 cm deep groove, after planting slightly step on the solid, after the cover step on a step, in order to facilitate the protection. The sowing rate per acre is 15-20 kg. Field management. When the seedlings "pull the cross," see the soil is dry and can be filled with water once, and apply 10 to 15 kg of ammonium sulfate per acre in combination with irrigation to promote strong seedlings. Later, when the soil begins to freeze, it is basically not watered or fertilized. Seedlings grow. Enclosing the frozen water before freezing the soil is an important measure for overwintering and protecting the seedlings. It is better to freeze at night and freeze at noon during the day. It is advisable for the conditional households to irrigate manure water, which can not only keep warm and prevent cold and prevent the death of soil cracks in the following spring, but also ensure the supply of fertilizer and water after spinach returns green. Preventing windbreaks before freezing can not only improve the conditions of the microclimate, protect the spinach from wintering safely, and return to green harvest in advance, but also prevent the harm of livestock. During the winter, there is snow on the spinach seedlings that must be cleaned in time to prevent the spinach from being licked or stuffy when it is thawed. It takes 30 to 40 days for spinach plants to grow to harvest when they pass winter. When the seedlings return to green in the second year of spring, the soil temperature is low, and the soil is not fully dissolved. Generally, no fertilizer is applied in the irrigation. Turning back to Qingshui must be irrigated when the tillage layer has been thawed. Irrigation early to reduce the temperature, delay the growth of spinach, postponed due to lack of water in the soil, resulting in early spinach twitching. Turn back to Qingshui. When spinach seedlings grow to 6-7 cm in height, choose sunny days for irrigation. After returning green, combined irrigation and returning to Qingshui topdressing nitrogen fertilizer. Per-mu over-wintering spinach applied 16.5 kg of nitrogen fertilizer, 7.5 kg of phosphate fertilizer, and 12.5 kg of potassium fertilizer. China Agricultural Network Editor