| Dual mulching of ridges and furrows is a new measure suitable for crops grown on terrace dryland in hilly and gully regions of the Loess plateau. The systematic study on the spatial and temporal distribution of soil moisture at three planting densities of millet under the measure indicated that compared with plastic film mulching and control, the mesure showed the following characteristics: ① There was no significant differences in soil moisture between the ridges and furrows; ② The trend for soil moisture to vary with time in the treatments lagged behind that for the control whose soil moisture was always higher than those in the treatments during the whole growing season; ③ The consumption of water surpassed the rainfall during the growing season, thereby resulting in water shortage in soil, and thus the soil water in fallow period made a great contribution to the consumption of water during the growing season. Meantime, sevaral proposals were putforward as to the measures. |