Growth and development: The growth process of spinach can be divided into two periods: vegetative growth period: from cotyledon unearthed to inflorescence differentiation. Seed germination temperature 4 °C, moderate temperature 15-20
°C, the temperature is too high, the germination rate is reduced, and the germination time is longer. The cotyledons unfold to two true leaves and grow slowly. After two true leaves are unfolded, the number of leaves and the leaf weight
And the area of ​​the leaf has grown rapidly. When the daily average temperature is below 23°C, the speed of the primordial differentiation of the seedlings is slowed down as the temperature decreases. Leaf average daily temperature
The fastest growth is at 20-25°C. After the seedlings differentiated the inflorescence primordia, the number of basal leaves no longer increased. The number of leaves during inflorescence differentiation varies with the sowing date, 6-7 fewer,
More than 20 pieces. Reproductive growth: inflorescence differentiation to seed maturity. Spinach is a typical long-day crop that can undergo flower bud differentiation under long-day conditions
The temperature range is very wide. Summer sowing spinach can still differentiate flower buds without experiencing temperatures below 15°C. The number of days from inflorescence differentiation to convulsions is very different due to different sowing dates
Different, short 8-9 days, the elderly more than 140 days. The length of this period is related to the harvest period and length and the level of output. The spinach has strong cold resistance, and the winter average is the most
Areas with a low temperature of about -10°C can be safely exposed through the winter. Cold-tolerant varieties, with 4-6 true leaf plants, can withstand short-term low temperatures of -30°C. Cultivation techniques
Surgery: Spinach requirements for the soil is not strict, sandy soil on the performance of early maturing, easily cultivated in the clay loam soil yield. Low acid resistance, suitable soil
The pH is 5.5-7 and the soil pH is below 5.5 or 8 and it grows poorly. Main cultivation times: Seeding in early spring, Harvesting in spring, Spring spinach, Summer sowing
Harvest, called autumn spinach; autumn sowing spring harvest, said overwintering spinach; spring sowing, summer harvest, said summer spinach. Live broadcast, early spring and summer sowing, for protection
All the seedlings were certified. The seeds were first soaked in water at 15-20°C for one day and germination followed by wet sowing. Generally, the sowing amount per hectare is 3-3.5kg. Overwintering spinach has a large seeding rate of more than 4-10 per mu.
Kg. In northern China, flat crickets are often used, and in the south, sorghum is used for cultivation, spreading or drilling. Two true leaves after the application of effective nitrogen fertilizer 1-2 times. Spinach for Nitrogen, Phosphorus, Potassium
The absorption ratio is 2:1:2.5, excessive application of nitrate nitrogen fertilizer will increase the nitrate content. The soil moisture during the whole growth period must be kept at 70-
80%. In order to prevent spinach winter dead seedlings, we must protect against cold. In northern China, wind barriers, irrigation of “frozen waterâ€, and manure removal were adopted before the soil was frozen. For the protection
To verify the growth of spinach seedlings and promote the growth of the Yangtze River basin and southern China, the use of scaffolding shelters to reduce the high temperature and heavy rain hazards. Seed sowing with spinach
It can be slightly later than wintering spinach. Drilling, spacing 20-23cm. After spring returning to spring, the male plants were removed and the early male strains were pulled out, leaving a portion of the nutritional male plants.
The distance reaches about 20cm. Congestion period should not be more irrigation, so as to avoid thin and weak lodging buds, reduce seed production. After flowering, top dressing, irrigation, leaf spray 1-2% of phosphorus
The calcium acid makes the seeds full. After the female plant seeds, the male plants are removed to facilitate ventilation. Most stems and leaves are yellow, harvested when seeds mature, threshing after several days of ripening
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