Equilibrium relationships of soil organic carbon in the main croplands of northeast china based on structural equation modeling Distribution characteristics of organic carbon and total nitrogen in dry farmland soil aggregates under different tillage methods in the Loess Plateau of central Gansu Province Effect of Tillage and Mulching on Enzyme Activities of Apple Orchard Soil Effect of Tillage and Mulching on Enzyme Activities of Apple Orchard Soil Effects of Soil Tillage Practice on Dry Matter Production and Water Use Efficiency in Wheat The synergy effects of water and fertilizer supply on a rotational system of spring wheat and peas under different tillage practices in a loess hilly region Soil respiration and its responses to soil moisture and temperature under different tillage systems in dryland maize fields Effects of tillage practices on nitrogen accumulation and translocation in winter wheat and NO3--N content in soil Effect of Tillage Practices on Growth and Development and Yield of Winter Wheat in Double Cropping Area in North China Effects of different tillage practices on fungi community structure and ecologic characteristics in loess soils Effects of crop pattern, tillage practice and water and fertilizer management on weeds and their control mechanisms Dynamics of leaf water potential of spring wheat and responses to environmental factors under different tillage practices on dry land