Ｓ３３０７是继ＰＰ３３３之后合成的一种新型植物生长延缓剂，具有活性高、用量少、残留期短等特点。试验结果表明使用Ｓ３３０７不同浓度浸种能降低株高、促进根系活力，提高根／冠比，有培育壮苗的作用。并对秧苗叶绿素含量、光合速率等有明显促进效果，可增加光合产物的积累。田间花期使用Ｓ３３０７也有一定的增产作用 S3307 is a new type of plant growth retarding agent synthesized after PP333, which has the characteristics of high activity, less dosage and short residual period. The results showed that using S3307 different concentrations of soaking can reduce plant height, promote root activity, improve root / crown ratio, the role of nurturing seedlings. And the seedling chlorophyll content, photosynthetic rate and other significant promotion effect, can increase the accumulation of photosynthetic products. Field flowering S3307 also have a certain yield-increasing effect