经4年多点试验(1986～1989年),稀土可以提高山楂座果率46.7～120.0%,增产19.9～50.7%。如配合赤霉素效果更好,座果率提高1～2倍,增产71.0～117.9%。使果实着色提前7～10天,果实亮红,花青苷提高16.5%。喷施稀土的适宜浓度为400～500ppm,于初花至盛花期喷施。果实膨大期再喷施一次有一定效果。我国稀土资源丰富,藏量居世界首位。稀土农用研究,我国又处领先地位,已成功地应用于粮食、油料等几十种作物。山楂是我国的特有果树,山楂营养丰富,还具有重要的药用价值,在国际市场上很受欢迎。长期以来,山楂生产存在着管理粗放、品质差、产量低等问 After more than four years of experiment (1986 ~ 1989), rare earth can increase the fruit rate of 46.7 ~ 120.0% and increase 19.9 ~ 50.7%. As with gibberellin better, fruit set rate increased by 1 to 2 times, an increase of 71.0 ~ 117.9%. So that the fruit coloring 7 to 10 days in advance, the fruit bright red, anthocyanin increased 16.5%. Spraying appropriate concentration of rare earth 400 ~ 500ppm, flowering in early flowering to flowering. Spraying fruit once again spray a certain effect. Rich in rare earth resources in our country, ranking first in the world. Rare earth agricultural research, our country at a leading position, has been successfully applied to dozens of crops such as grain, oil and other crops. Hawthorn is a peculiar fruit tree in China. Hawthorn is nutritious and has important medicinal value. It is very popular in the international market. For a long time, hawthorn there is extensive management, poor quality, low yield and other questions