Dilatant can be mixed with general pesticides, and can enhance the efficiency of each other; Do not spray in the rain, and spray again when it rains within 4h after spraying; The concentration of expansion factor is high, please prepare according to the dosage; The expansion element is used when it is prepared, and should not be stored for a long time. The study on foliar spraying of potato tuber bulking element showed that potato tuber bulking element could promote the growth and development of potato, promote tuber bulking and starch accumulation, and increase the ratio of large to medium tubers; The tuber bulking element did not affect the number of tubers per plant; Spraying 3 to 4 times is suitable, which can increase the yield by 5.68% to 6.3%, and increase the rate of large and medium potatoes by 5.76% to 6.99%. The application of expansion element can significantly enhance photosynthesis, speed up cell division, promote rapid fruit expansion, coloring, anti cracking, reduce deformed fruit, increase sweetness, improve taste, improve fruit grade, mature and market early, promote stable and high yield of crops, and make the fruit uniform in size, correct in shape, good in color and appearance, and high in price. Expansive element is the second generation of plant growth regulator product, which contains powerful expansion factor of clopidourea and cytokinin, with high quality and content, 100% water soluble nutrition, full absorption, quick effect and high effect.