Spinach is a leafy crop, which requires a large amount of fertilizer. Scientific and rational fertilization is one of the important techniques to ensure the harvest of spinach. The fertilization of Bocai is divided into base fertilizer and topdressing.
First, the base fertilizer. Spring spinach is sowed early, can be fertilized in the whole year, 4,000 to 5,000 kg of organic fertilizer per mu, 20 to 25 cm deep, and the sputum is simmered. When the soil is frozen in the early spring, it can be sown 7 to 10 cm deep. It can be mixed with compost and fertilizer to make base fertilizer. Apply 3,000 to 4,000 kilograms of compost per acre, 30 to 35 kilograms of superphosphate, 20 to 25 kilograms of urea, 10 to 15 kilograms of potassium sulfate, and 20 to 25 centimeters of deep ground.
Autumn spinach applies 4,000 to 5,000 kilograms of organic fertilizer per acre, 25 to 30 kilograms of superphosphate, and 20 to 25 centimeters deep, making sorghum or sorghum. Overwintering spinach selects soil with deep soil layer, fertile soil, high humus content, good fertilizer and water storage capacity. It can apply 5000 kg of decomposed organic fertilizer per acre, 25-30 kg of superphosphate, and 20-25 cm deep. Mix the soil and fertilizer thoroughly, loosen the soil, and promote seedling emergence and root development.
Second, topdressing. In the early stage of growth, spring spinach generally does not need to fertilize water. In the middle and late stages of growth, the amount of absorbed fertilizer and water is increased, and 10 to 15 kg of urea can be applied per acre.
Due to the short growth period of spring spinach, sufficient nitrogen fertilizer can make the leaves grow vigorously and delay the convulsion period.
Summer spinach is sown in the hot season, after 2 to 3 true leaves appear, chasing 1 or 2 times of available nitrogen fertilizer, 10 to 15 kg of urea per acre, and timely watering after fertilization. Additional nitrogen fertilizer can also be applied by 0.3% urea foliar application.
After the autumn spinach seedlings are unearthed, when 4 to 5 true leaves are grown, 2 to 3 times of quick-acting nitrogen fertilizer should be applied in stages. Apply 10 to 12 kilograms of urea per acre of water to promote thickening of leaves, increase yield and improve quality.
Wintering spinach should be fertilized due to its long growth period, which can be divided into three stages: winter, winter and early spring. The growth period before winter is about 50 to 60 days, combined with irrigation and chasing 1 time fertilizer, 5 to 8 kg of urea per application. When pouring "frozen water", apply 1000-1500 kg of diluted manure water. Do not need topdressing to stop the growing season in winter.
In the early spring, the growth period is 30 to 40 days. When the spinach leaves are green, the heart leaves begin to grow, and the water can be poured once. After the spinach enters the vigorous growth period, it should be topdressed in time, and 5 to 8 kg of urea should be applied in combination with watering.
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