Abstract:Based on the field experiments,soil moisture dynamics of a maize field was studied. Impacts of different land overs on soil moisture were conducted in comparison with soil moisture of a millet field and fallow field. Theresults showed that precipitation in the raining season played an importantrole in supplying soil water in the maize field and the soil moisture’s dynamic period was coincided with the raining season;different land covers had strong effecton the soil moisture,and the evapotranspiration amounts of maize and millet plots were 502. 9 mm and 473.9 mm,respectively,but the fallow land,only 414.lmm;the ET/ Eo ratio of the maize field (evapotransipration/water surface evaporation) in the entire growing period was 0.77,however,its ratios was greater than 1.00 in thejointing stage and the following stage. The ratio for the whole growing period was 0.69 on the millet field.Abstract:Based on the field experiments,soil moisture dynamics of a maize field was studied. Impacts of differentland covers on soil moisture were conducted in comparison with soil moisture of a millet field and fallow field. The results showed that precipitation in the raining season played an importantrole in supplying soil water in the maizefield and the soil moisture’s dynamic period was coincided with the raining ason;different land covers had strong effecton the soil moisture,and the evapotranspiration amounts of maize and millet plots were 502.9 mm and 473.9 mm,respectively,but the fallow land,only 414.lmm;the ET/ Eo ratio of the maize field (evapotransipration/water surface evaporation) in the entire growing period was 0.77,however,its ratios was greater than 1.00 in the jointing stage and the following stage. The ratio for the whole growing period was 0.69 on the millet field.Based on the field experiments,soil moisture dynamics of a maize field was studied. Impacts of different land covers on soil moisture were conducted in comparison with soil moisture of a millet field and fallow field. The results showed that precipitation in the raining season played an importantrole in supplying soil water in the maize field and the soil moisture’s dynamic period was coincided with the raining season;different land covers had strong effecton the soil moisture,and heevapotranspiration amounts of maize and millet plots were 502. 9 mm and 473.9 mm,respectively,but the fallow land,only 414.lmm;the ET/ Eo ratio of the maize field (evapotransipration/water surface evaporation) in the entire growing period was 0.77,however,its ratios was greater than 1.00 in the jointing stage and the following stage. The ratio for the whole growing period was 0.69 on the millet field.