The experiment of controlled release compound fertilizers(CRFs) on cotton in pot was studied by comparison the effects of CRFs on cotton with common compound fertilizers(CCFs).The results showed that

compared with the CCF

the CRF significantly increased the contents of NO~-_3-N

NH~ _4-N

available P and available K in the soil.The chlorophyll readings

plant height of the cotton treated by CRFs were greater than that of CCFs.The node

boll

yield of plant with CRFs treatments of any rate was insignificant greater than that of the cotton treated by CCFs.Though the application rate of CRF treatments was less than CCFs treatments in the experiment

the yield of the cotton of the CRFs treatments was still higher than that of CCF treatments.And the rate of increased cotton yield of CRFs was 113.05%

34.54% respectively

compared with pure N CRFs 0.2

0.4 g/kg soil.The CRF showed its advantages of controlling release nutrient

increasing yield and reducing nitrogen application rate.