[Objective] Exploring the effect of different fertilization measures on soil biological characteristics in the farmland of Dezhou City

Shandong Province

in order to provide theoretical basis for the fertilization of farmland and reasonable plantation of crops.[Methods] A field experiment including four treatments

i. e. CK (neither urea nor cattle manure was applied)

CF (100% of nitrogen was provided by urea)

CM (100% of nitrogen was provided by cattle manure)

and CM+CF (50% and 50% of nitrogen was provided by cattle manure and urea

respectively) was performed. The study was conducted to determine the effects of different treatments on soil nutrients

microbial population

microbial diversity index

active organic carbon and carbon pool management index in the farmland of Dezhou City.[Results] CM+CF treatment significantly increased available nitrogen

available phosphorus

available potassium and trace element contents

but decreased the pH value in the farmland soil. The microorganism population and contents of microbial biomass carbon and microbial biomass nitrogen were obviously increased by the use of CM+CF treatment. For bacteria quantity

it increased by 91.22%

65.47% and 17.11%

respectively

as compared with the treatments of CK

CF and CM. Meanwhile

the microbial diversity index was also found having the highest value in the CM+CF treatment

it had the same variation tendency as total microbial population had. However

the microbial diversity indices and microbial population had different variation tendency between CF and CK treatments. Additionally

the inertly organic carbon content and carbon pool management index in CM+CF treatment were also significantly higher than those of other treatments

indicating carbon pool management index increases by 69.52

67.84 and 38.61

respectively

as compared with the treatments of CK

CF and CM. However

less effect on farmland soil in CM treatment was observed in comparison with the one in CM+CF treatment.[Conclusion] Cattle manure co-applied with inorganic fertilizer could significantly improve soil biological characteristics in the farmland of Dezhou City

which was beneficial to increase soil fertility and enhance nutrient supplying capability.