Evaluation of the quality of soil fertility using entire-array-polygon indicator method Research progress on the effect and mechanism of fertilization measure on soil fertility Effect of submergence on rhizospheric soil enzyme activity and fertility of bermudagrass (Cynodon dactylon) Nutrient cycling and balance in farmland ecosystem in Bohai Lowland Plain Effect of rice husk biochar on lettuce Cd uptake and soil fertility Dynamic characteristics of soil nutrients and soil microbial biomass of field-returned straws at different decay accretion conditions