Huangzhengqing, Heping Township, Qingpu District, Huai’an City, said on September 1 that the earliest seeding of local live rice was late, and that large areas of rice were not heading, and even Rice No. 5 and Lianjing No. 6 had just begun to break, Xudao No. 3 The rice of Xudao 4 has not yet been breached. These live rice without heading were sown on June 15-20. He asked if it would be possible to spray gibberellic acid on rice that did not have heading and promote heading. Gibberellic acid, also known as gibberellin, is a broad-spectrum type of plant growth regulator. It mainly enters the plants through leaves, shoots, flowers, seeds or fruits, and then it conducts to active parts. The drug can promote cell elongation, resulting in elongation of stems and plants, lifting the dormancy of seeds and tubers, and promote germination, change the ratio of male and female flowers, affect flowering time, reduce flower and fruit shedding. Gibberellic acid is often used in hybrid rice seed production to regulate flowering and promote maternal heading to prevent necking. Studies have shown that spraying gibberellic acid to promote internode elongation of rice, its mechanism is to change the concentration of the solution between plant cells, causing moisture to flow into the cells due to osmotic pressure, cell expansion and impact on the cell wall loose and cause cell expansion and elongation, The concentration of gibberellic acid sprayed on rice varies depending on the severity of the neck packing. If the spraying concentration is too large, it will cause the internodes under the ear to break too long. Spraying gibberellic acid at the heading stage of rice breaks should be based on plant growth. If rice grows normally, it should not be applied to prevent the last section of the rice plant from being pulled too long, causing late lodging. If the growth of rice is inhibited and heading is difficult, the neck phenomenon may occur, and appropriate spraying may be applied. The above-mentioned direct-seeded rice fields used medium-maturity medium-japonica rice from June 15th to June 20th. By September 1st, some field plots had begun to break and heading, and rice growth was normal. Do not spray gibberellic acid to promote plant heading.