欧美牲交a欧美牲交aⅴ免费下载,久久99精品久久久久久欧洲站,日韩国产欧美另类视频一区,精品无码一区二区三区无码密臀

1.It can induce differentiation of plant root tissue, stimulate hair roots and increase the number of roots.
2.Promote cell elongation, regulate the growth of organs and tissues.
3.Improve the absorption and operation of nutrient elements, regulate vegetative growth and reproductive growth.
4.Promote cutting rooting, transplanting rooting, fruit setting, fruit enlargement.