Application method of autumn spinach base fertilizer and top dressing

First, the base fertilizer. Autumn spinach applies 4000-5000 kg of organic fertilizer per acre, 25-30 kg of superphosphate, 20-25 cm deep, Yipingyu (Northern Yiping, South Yigao). Overwintering spinach chooses soil with deep soil layer, fertile soil, high humus content, good fertilizer and water storage capacity. It should also apply more organic fertilizer than other seasons. It can apply 5,000 kg of decomposed organic fertilizer per mu, and superphosphate 25-30 Kg, deep turn 20-25 cm, so that the soil and fertilizer are fully mixed, loose soil, promote seedling emergence and root development.

Second, topdressing. After the autumn spinach seedlings are unearthed, when they grow to 4-5 true leaves, they should be applied 2-3 times of quick-acting nitrogen fertilizer in stages. 20-25 kg of ammonium sulfate per hectare, or 10-12 kg of urea, 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. Before the winter, the growth period is about 50-60 days, combined with irrigation and chasing 1 time fertilizer, applying 10-15 kg of ammonium sulfate per acre of water. 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 30-40 days. When the spinach leaves are green, the heart leaves begin to grow, and the small water can be poured once. After the spinach enters the vigorous growth period, it should be topdressed in time, combined with watering 10-15 kg of ammonium sulfate per acre. In this period, sufficient fertilizer and water supply can be provided, which can delay convulsions, increase production and improve quality.

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