Generally, the flower disk is formed to the flowering stage, which is the peak of fertilizer demand for sunflower(gallon plant pot). There is more phosphorus in the period from emergence to flower formation, and more nitrogen is needed from the formation of flower discs to the end of flowering period(wholesale greenhouse pots). Therefore, sunflower fertilization is mainly phosphorus in the early stage, and nitrogen and potassium are the main in the middle and late stages.
The principle of fertilization is to apply enough base fertilizer, re-apply fertilizer, and apply it at a proper time(cell trays). The general base fertilizer is mainly based on farmyard manure. The average field is 1,500 to 2,500 kg per mu, and the high-yield field should be applied to 3000 to 4000 kg. If the phosphate fertilizer is used as the base fertilizer(greenhouse supplies pots), 30 kg of calcium phosphate is applied to the field, and about 50 kg is applied to the high-yielding field.(cheap large 3 gal plastic plant containers for sale)
However, no vegetation is used in the saline-alkali soil(gallon nursery pots). The fertilizer should use quick-acting nitrogen, phosphorus, potassium fertilizer and fine manure and poultry excrement. Use less and fine. Each acre can be applied with 15-30 kg of calcium phosphate, 10-15 kg of potassium chloride or potassium sulfate or 35 kg of ash(plastic grow pots). On the thin hillside or gravel soil, it is necessary to add 4-7 kg of ammonium nitrate or 10 kg of ammonium sulfate.
For every 100 kg of sunflower seeds produced, nitrogen (n) 4.59 to 6 kg, phosphorus (p2o5) 2.6 to 3.04 kg, and potassium (k2o) 18.6 to 30 kg are absorbed from the soil(black plastic plant pots). Potassium fertilizer can be applied to 50-75kg of grass ash. The key period of sunflower topdressing is before the buds(flat plastic tray). Generally, phosphorus and potassium fertilizers are used as base fertilizer or seed fertilizer, while nitrogen fertilizer is used as top dressing or 1/3 as base fertilizer, and 2/3 is used as top dressing.
(cheap large 3 gal plastic plant containers for sale)Sunflowers sown in summer and autumn need to be applied to seedlings(propagation tray). Shi Shi or acupoint application. In the autumn and winter or winter and spring, planting is carried out by using the edge of the greenhouse, the gap, the front and back of the main vegetables, and the intercropping(36 cell propagation trays wholesale). When planting, it should be planted at any time during the cold season according to market demand and greenhouse planting conditions.
Spring-sowed sunflowers that are cooked every year are not pursued when the base fertilizer or seed fertilizer is sufficient(square nursery pots). When the soil effective boron content is less than 0.4mg/kg, boron fertilizer should be added. Boron fertilizer has a better yield-increasing effect on sunflower. That is, 29.35 kg of urea and 9.8 kg of super-calcium phosphate. Topdressing is divided into seedling stage and topdressing(40 cell propagation trays wholesale). A hole or strip can be applied to the seeding ditch.
Sunflower nitrogen and potassium fertilizers are chased in 7-8 pairs of leaves(plug trays), and topdressing without fertilizer application should be appropriate. In pig manure, topdressing is generally applied with 10-15 kg of ammonium nitrate, 20-25 kg of ammonium bicarbonate, 7.5-10 kg of urea, 20 kg of superphosphate and 15 kg of potassium chloride(51 cell propagation trays wholesale). It can be mixed with 150g borax per mu in time, or sprayed with 0.1%~0.2% borax aqueous solution before flowering.(cheap large 3 gal plastic plant containers for sale)
Sunflower is a crop that requires more fertilizer(seed starter trays). Decomposed manure is good. Generally, the seedbed should be disinfected before sowing. Seeds need special treatment for disinfection, soaking and germination. Pay attention to heat preservation after sowing. After the emergence of the seedlings, the ground temperature is low, it is better to water less and more tillage(40 cell plug tray wholesale). When the growth of the seedlings is accelerated, the number of watering is appropriately increased.