In view of the difference of soil water and solute migration between transverse ridge planting and along-slope ridge planting modes in sloping farmland

a field simulation experiment was conducted to monitor soil water distribution and Br-concentrations distribution in different ridge planting modes

including ridge beds

ridge sides and furrows

taking the soybean sloping land with a slope of 7° as the research object and Br-as the tracer.To explore the effects of transverse and along-slope ridge planting modes on soil water migration and soluble nutrient distribution in sloping farmland.The results showed that the maximum soil water content of the two modes was distributed between the 10—20 cm soil layer in transverse ridge cropping and between the 5—15 cm soil layer in the along-slope ridge planting mode

which proved the effect of transverse ridge planting mode on rainwater storage.The maximum soil water storage was found in the ridge side on the upper side of the ridge under the transverse ridge planting mode

and that in the ridge and furrow under along-slope ridge planting mode.The variation coefficient of soil volumetric water content in each soil layer under different ridge planting patterns was larger in the range of 0—5 cm

50—60 cm

and was between 8.97 and 11.90.The variation coefficient of soil volumetric water content in the middle layer was smaller

and fluctuated between 0.91 and 8.76.The Br-ions migration along the slope direction was obvious in the soil layer of 20—60 cm under the ridge planting along the slope

while Br-ions migration occurred in the soil layer of 40—60 cm under the ridge planting on the transverse slope.The ratio of soil Br-ions total amount in the ridge of the furrow and the lower part of the slope (transverse ridge planting:side of the ridge;along-slope ridge planting:among the plant) was 3∶7 in the two ridge cultivation modes.The total amount of Br-ions in the center of ridge bed under the along-slope ridge planting modes was only 54.33% of that under transverse ridge planting mode

which could reduce the migration of Br-ions in soil along the slope.Based on the results of this study

it can be concluded that applying non-absorbable nutrients on the ridge side can reduce their migration and loss

which is beneficial to improve the utilization efficiency of nutrients by crops.