We examined the physical and chemical properties of reclaimed soil in coal-mining subsidence areas

and the influences of biochar and combined application with organic and chemical fertilizers for three consecutive years.The results were as follows: all treatments could improve soil physical

chemical and biological properties. Compared with the control

organic + biochar treatment significantly decreased the soil bulk density by 10%

and increased soil pore water content by 7.14%

while the change of soil pH was not obvious. Compared with chemical fertilizer treatment

Soil available phosphorous

potassium in chemical + biochar treatment increased by 8.33%

and 6.34%

respectively

whereas biochar had little effect on soil alkaline nitrogen， little increase in the number of bacteria

fungi

actinomycete in organic+biochar treatment; the number of fungi increased significantly by 11.7% in chemical + biochar treatment. Corn production in organic + biochar treatment and chemical + biochar treatment increased by 3.03%

and 2.70% respectively

while biochar had little effect. Therefore

the application of organic and chemical fertilizer is beneficial to improve the reclaimed soil

while biochar is?of?no use.