Changle is a special rare earth product for agriculture mainly consisted of La and Ce. It is identified that Changle has the effect to increase production and improve quality of crops since it can stimulate rooting, germinating, raise the chlorophyll content and photosynthetic rate, and promote the absorption of P for crops through the researches and applications for more than 20 years. Changle can be used independetlyor mixed with some kind of fertilizers, herbicides, pesticides and trace elements. The required dosage is 450 - 750g for one hectare with seed dressing and foliage spraying.