Type: mainly organic fertilizer, try to use less chemical fertilizer.
Period and method of fertilization: the family does not need to plant the fertilizer in agriculture. It is usually mixed in the soil before planting for a few seconds. Or dig several 2-3cm deep holes around the plant after planting, and apply fertilizer to them.
Fertilizer dosage: 5-10g organic fertilizer per plant, if the plant is large, the dosage can be increased appropriately.
The main purpose of seed fertilizer application is to strengthen seedlings, and it should be applied in time after seed germination. Calcium phosphate was mainly used to add a small amount of uremic toxin.
Usage: after 3-5 days of seed germination, spread fertilizer on the surface of basin soil. Or 2-3cm beside the seed. Combine the organic fertilizer and chemical fertilizer to 2-3cm under the seed or 2-3cm beside the seed.
Type: mainly nitrogen fertilizer, supplemented by potassium fertilizer. Can choose urea, potassium chloride and other costs or rotten human excrement and urine, plant ash and so on.
Time: according to the growth of plants, soil conditions, applied base fertilizer, reasonable topdressing. But top dressing mainly concentrated in the period from budding to flowering.
Methods: a small pit was planed 10-15 cm away from sunflower for fertilization. Pay attention to the depth of fertilization, avoid direct contact with the root system, and apply it in the wet water layer, which is conducive to the fertilizer effect.
The foliar fertilizer of sunflower is mainly sprayed after budding. Spray zinc, copper, manganese and molybdenum solutions after budding, and nitrogen, phosphorus and potassium solutions after flowering to make the flowers bright and the leaves green.
