Spinach is a green leafy vegetable that can be planted throughout the year. It requires pure nitrogen (N) 2.1 to 3.5 kg, phosphorus (P2O5) 0.6 to 1.1 kg, and potassium (K2O) 3.0 to 5.3 kg per 1000 kg of commercial vegetables. According to the production season, fertilization techniques for spring spinach, summer spinach, autumn spinach, and winter spinach are different.
First, base fertilizer
Spring spinach sowing early, can be fertilized before the Spring Festival, per acre Shiren organic fertilizer 4000 to 5000 kg, 45% of the general-purpose compound fertilizer 40 to 50 kg. Deep-turn 20 to 25 cm, squatting do flat, when the early spring soil defrosting 7 to 10 cm deep when you can sow.
Summer spinach to choose a neutral viscous soil is appropriate, can be used as soil fertilizer and fertilizer mixture spread base fertilizer. Per-mu soil compost 3000-4000 kg, 30-35 kg of superphosphate, 20-25 kg of nitrogen fertilizer, 10-15 kg of potassium sulfate, or 40-50 kg of high-nitrogen-potassium compound fertilizer, deep-dip 20-25 In centimeters, it is flat.
Autumn spinach per acre applied organic fertilizer 4000 to 5000 kilograms, superphosphate 30 to 40 kilograms or high phosphorus compound fertilizer 25 to 30 kilograms, deep-turning to 20 to 25 centimeters, do sorghum or flat eel.
Overwintering spinach can spread 5,000 kilograms of organic manure per acre, 30 to 35 kilograms of superphosphate or 25 kilograms of high-phosphorus compound fertilizer, and 20 to 25 centimeters of deep-turning soil to fully mix the soil fertilizer, loosen the soil, and promote seedling excavation. Root development, adequate basal fertilizer, and robust seedling growth are the key to safe wintering of vegetables.
Second, top dressing
Spring spinach in the late reproductive period, increase the absorption of fertilizer and water, per acre can be followed by water topdressing nitrogen fertilizer 15 to 20 kg or high nitrogen compound fertilizer (28-8-8) 10 to 15 kg. Due to the short growth period of spring spinach, sufficient nitrogen fertilizer can make the leaves grow vigorously and delay the bolting period.
Summer spinach is planting in the hot season, there are 2 to 3 true leaves, chase 1 to 2 times available nitrogen fertilizer, can apply 10 to 15 kg of nitrogen per acre or high nitrogen compound fertilizer 10 to 15 kg.
After the autumn spinach seedlings are unearthed, when they grow to 4 to 5 true leaves, topdressing nitrogen fertilizers should be applied 2 to 3 times in stages. Each acre along the water topdressing nitrogen fertilizer 20 to 25 kg, or high nitrogen compound fertilizer 15 to 20 kg. Promote thicker blade growth, increase yield, improve quality.
Overwintering spinach requires a long period of dormancy in the winter, so pay attention to fertilization. Before wintering, the spinach seedlings are about 10 cm high. According to the growth condition, the top-dressing wintering fertilizer can be used to recover 10 to 15 kg of general-purpose compound fertilizer. In the spring of next year, fertilizers should be applied in time. Nitrogenous fertilizers of 20 to 25 kilograms or high nitrogen compound fertilizers of 15 to 20 kilograms can be used to increase leaf nutrient and promote plant growth. After spinach enters a vigorous growth period, it should be top-dressed in time, combined with watering and applying nitrogen fertilizer per acre. 10 to 15 kg.
Note: The growth period of spinach is short, and the best available fertilizer is basal fertilizer and top dressing. Applying ammonium nitrogen cautiously, spinach is more sensitive to ammonium ammonia, and the production season of overwintering spinach is at the junction of autumn and winter and winter and spring, the soil temperature is low, and the soil nitrification is very weak. It will not be very quick after applying ammonium nitrogen fertilizer. It is converted to nitrate nitrogen, so it is best to use nitrate nitrogen fertilizer.
Third, the trace elements in the fertilization
In iron deficiency, zinc, manganese, boron and other trace elements on the soil, prone to yellow leaves, leaflets, soft rot, etc., can be sprayed in the growth phase of 2 to 3 trace element solution to improve the resistance of spinach, promote Spinach grows.
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