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Characteristics and Laws of Fertilizer Needed in Sunflower Flowering Period

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It is the turning point of sunflower growth. After flowering, the root system grows gradually slowly, and the aerial part is still in the stage of vegetative growth and reproductive growth, including the growth of stems and leaves, and the growth of flowers and discs. The content of protein and fat in sunflower seeds is very high, the crude fat content is as high as more than 40%, and the crude protein content is about 30%. Therefore, after flowering, the stage of carbon and nitrogen metabolism in the plant can still be maintained for a period of time. The nitrogen, phosphorus, and potassium absorbed during flowering were 42%, 27%, and 24% for edible sunflowers, and 31%, 31%, and 24% for oil sunflowers. Increasing the nitrogen nutrition level within a certain limit can increase the nitrogen content of stems, leaves and discs, which is beneficial to photosynthesis, synthesizing more carbohydrates and increasing oil content. In addition, nitrogen is also necessary for the growth of the flower disc and the formation of the seed coat structural material.

Sunflower mature period needs fertilizer

Sunflower can enter full bloom 3 to 5 days after flowering, and gradually enter mature stage after pollination. The synthesis process in the mature plant is mainly the formation of oil in the grain and the synthesis of protein. The oil of the seeds is converted from the photosynthetic products of the leaves - carbohydrates after being transported to the seeds. Substances that can be converted into oils and proteins are called plastic substances. This substance can form both oil and protein. Because of these two possibilities, the content of protein and oil in seeds is in a relationship of ebb and flow. Which direction the plastic material transforms in the seed depends on the external environmental conditions. Therefore, as early as after flowering, the nitrogen nutrient level should be appropriate. When the nitrogen supply is too much, it will promote the conversion of plastic substances into proteins, and the oil content will be relatively reduced.

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