Spinach with fertilizer should be cautious
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.
Summer spinach is suitable for selecting neutral clay soil. It can be applied as a base fertilizer by using a mixture of compost and fertilizer. Apply 3,000 to 4,000 kilograms of compost per acre, 30 to 35 kilograms of superphosphate, 20 to 25 kilograms of ammonium sulfate, 10 to 15 kilograms of potassium sulfate, and 20 to 25 centimeters of deep ground.
Autumn spinach is applied with 4000~5000 kg of organic fertilizer per acre, 25~30 kg of superphosphate, and 20~25 cm deep, and it is made of sorghum or sorghum.
Overwinter spinach can be applied to 5,000 kg of decomposed organic fertilizer per acre, 25~30 kg of superphosphate, 20~25 cm deep, so that the soil and fertilizer are fully mixed, loose soil, promote seedling emergence and root development, sufficient base fertilizer, seedling growth Robust is the key to safe wintering of vegetables.
Second, top dressing
In the middle and late growth stages of spring spinach, the amount of absorbed fertilizer and water is increased, and 15 to 20 kg of ammonium sulfate 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 being planted in the hot season. After 2~3 true leaves appear, chasing 1~2 times of available nitrogen fertilizer, 10~15 kg of ammonium sulfate per acre.
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. 20 to 25 kg of ammonium sulfate per hectare, or 10 to 12 kg of urea, promote thickening of leaves, increase yield and improve quality.
Wintering spinach requires long periods of dormancy in winter, so pay attention to fertilization. Before wintering, the spinach seedlings are about 10 cm high. According to the growth situation, the wintering fertilizer should be applied once, and the ammonium sulfate can be applied 10~15 kg. In the spring of the next year, it should be topdressed in time. It can be applied with 20~25 kg of ammonium sulphate and sprayed with 2~3 times of “Phosphorus Potassium Power†800~1000 times solution. Increase leaf nutrition and promote plant growth After spinach enters the vigorous growth period, it should be topdressed in time, combined with watering 10~15 kg of ammonium sulfate per acre.
Note: Spinach has a short growth period, and it is best to use quick-acting fertilizer for base fertilizer and top dressing. The ammonium is sensitive to ammonium, and the spinach is sensitive to ammonium ammonia. The production season of wintering spinach is at the junction of autumn and winter and winter and spring, the soil temperature is low, the nitrification of soil is very weak, and the application of ammonium nitrogen fertilizer will not be very fast. Converted to nitrate nitrogen. Therefore, it is best to use nitrate nitrogen fertilizer.
Third, medium and trace elements foliar fertilization
Some soils have the problem of iron, zinc, manganese, boron and other trace elements, yellow leaves, small leaves, easy to soft rot, poor growth, etc., can be supplemented 2 to 3 times in the growing season, according to the local soil conditions Foliar fertilization can be carried out by using “Hefeng Boron†800~1000 times, “Hefeng Zinc†3000~5000 times, “Hefeng Iron†1500~2000 times, etc., in the case of freezing damage, drought and saline soil, Combined with "sea chlorophyll" 1000~1200 times solution spraying, it can improve the resistance of spinach and promote the growth of spinach.
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