BIOLOGICAL PROPERTIES AND ENZYMATIC ACTIVITY OF ARABLE SOILS AFFECTED BY LONG-TERM DIFFERENT FERTILIZATION SYSTEMS Diurnal variation of soil basal respiration and CO2 emission from a typical paddy soil after rice harvest under long-term different fertilizations Effects of long term fertilization on rice grain qualities and soil fertility factors in yellow paddy fields of southern China Effects of long-term fertilization on soil organic carbon pool and carbon sequestration under double rice cropping.