How to fertilize sunflowers for good growth? A detailed guide to the method
How should sunflowers be fertilized for good growth? Please give an introduction. For every 100 kg of sunflower seeds produced, edible sunflowers require 6.22 kg of nitrogen (N), 1.33 kg of phosphorus (P2O5), and 14.6 kg of K2O, with an N:P2O5:K2O ratio of 1:0.2:2.3; oilseed sunflowers require 7.44 kg of nitrogen (N), 1.86 kg of phosphorus (P2O5), and 16.6 kg of K2O...
How should sunflowers be fertilized for good growth? Please give an introductionFor every 100 kg of sunflower seeds produced, edible sunflowers require 6.22 kg of nitrogen (N), 1.33 kg of phosphorus (P2O5), and 14.6 kg of K2O, with an N:P2O5:K2O ratio of 1:0.2:2.3; oilseed sunflowers require 7.44 kg of nitrogen (N), 1.86 kg of phosphorus (P2O5), and 16.6 kg of K2O, with an N:P2O5:K2O ratio of 1:0.3:2.3.
Sunflowers absorb different amounts of nitrogen, phosphorus, and potassium at different growth stages. During the seedling stage, growth is relatively slow and nutrient requirements are low; the amounts of nitrogen (N), phosphorus (P2O5), and potassium (K2O) absorbed account for 14%, 20%, and 24% of the total for the whole growth period. The role of nutrients at this stage is mainly to promote strong seedlings and lay the foundation for a high yield.
From flower disc formation to full bloom, vegetative growth and reproductive growth are vigorous, and dry matter accumulation is fastest; this is the key period of nutrient demand in the plant's life, with nitrogen (N), phosphorus (P2O5), and potassium (K2O) uptake accounting for 51%, 53%, and 47% of the whole growth period total (edible sunflowers). Sunflowers enter full bloom 3-5 days after flowering, and gradually enter the maturity stage after pollination. Sunflowers still absorb a certain amount of nitrogen, phosphorus, and potassium during the maturity stage; edible sunflowers absorb 35%, 27%, and 29%, while oilseed sunflowers absorb 30%, 35%, and 24%.
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