Abstract: In order to made controlled release blend bulk fertilizers for peanut,three controlled release blend bulk fert ilizers,the ratio of N:P₂O₄:K₂O were 14:13:15,11:14:17 and 14:14:17,were made of common straight fertilizers(urea,diammonium phosphate,potassium chloride and sulphate potassium).In 2007,a field experiment was conducted to study the effect of controlled release blend bulk fertilizers on the soil ammonium and nitrogen dynamics during the growing season of peanut at Culai town,T aian city,Shandong province.The result showed that soil ammonium content of 0-20 cm layer is highest.In the soil profile,the soil ammonium contents show the trent of decreasing,increasing and decreasing with the profile depth.And the nitrate nitrogen content of profile soil has the same change trent with soil ammonium,but the increasing layer of soilnitratenitrogen is more and more deep during the peanut growing seasons.Comparing to single applying common fertilizers,the controlled release blend bulk fertilizers increased soil ammonium content of same profile layers of single applying common fertilizers treatment in podding stage and mature stage.And the controlled release blend bulk fertilizers can reduce the nitrate nitrogen content of same profile layers of CF treatment.It show that the controlled release blend bulk fertilizers can reduce the soil nitrate nitrogen content and decrease the disaster of water being polluted.And it can overcome the shortcoming of single applying common fertilizers that nitrogen is too much in seeding stage and nitrogen is too small in others growing stage.Comparing to single applying common fertilizers,the controlled release blend bulk fertilizers increased nitrogen utilization and reduce groundwater pollution.In the three kinds controlled release blend bulk fert ilizers,the sequence of effect is controlled release blend bulk fert ilizers1>controlled release blend bulk fertilizers2>controlled release blend bulk fertilizers3.

Key words: Controlled release blend bulk fertilizers, Peanut, Ammonium, Citrate nitrogen, Content

CLC Number: 

• S147.2