This study investigated the effects of different organic materials on soil fertility and crop nutrient absorption and utilization

so as to achieve farmland fertilization and improve crop nutrient use efficiency. A field fertilization experiment was conducted in Jiangxi Institute of Red Soil in 2015 to compare the effects of full scale chemical fertilizer and 40% of chemical fertilizer combined with different organic materials on soil fertility and crop nutrient use efficiency. Nine fertilization treatments were set in this experiment

including no fertilizer (CK)

chemical fertilizer (CF)

reduction of chemical fertilizer (RF)

chemical fertilizer combined with straw (CFR)

reduction of chemical fertilizer combined with straw (RFR)

chemical fertilizer combined with biochar (CFB)

reduction of chemical fertilizer combined with biochar (RFB)

reduction of chemical fertilizer combined with pig manure (RFP)

reduction of chemical fertilizer combined with vermicompost (RFV). The results showed that compared with the treatments of CF that added chemical fertilizer only

the application of organic materials increased the yields of rapeseed and sweet potato

and the yields in RFP and RFV treatments increased significantly

with an increase of 76.69% and 75.01%

84.73% and 69.72%

respectively. The application of organic materials enhanced the content of organic matter

total nitrogen

total phosphorus

available phosphorus and potassium

and the soil nutrient level was also further improved under continuous fertilization. In sweet potato and rape seasons

compared with the CF treatment

the application of organic materials could promote the apparent recovery efficiencies and partial factor productivities of nitrogen and potassium fertilizers

and the effect of RFP treatment was best in sweet potato season

the corresponding parameters increased to 43.22%

48.55% and 22.00 and 21.45 kg/kg respectively

however

the apparent recovery efficiency (1.91%) and partial factor productivity (3.25 kg/kg) of phosphorus in this treatment were low. In rape season

fertilizer contribution rate in the RFV treatment was the highest (80.41%)

but the agronomic efficiency was low

which was just 0.67 kg/kg. Therefore

the application of organic materials can improve soil fertility

increase crop yield and the utilization of fertilizer nutrients

which is significance for agricultural production.