| This paper studied the optimum width of ridge and furrow for foxtail millet in semi-arid area of south Ningxia,which aimed at increasing water availability to crops and yield farther.In the experiment there were four stripshapes(that is 30 cm,45 cm,60 cm,and 75 cm),the ratio of ridge to furrow was 1.Results showed that different widths of ridges and furrows had significant effects on foxtail millet yields,water storage and WUE.The mean WUE of different treatments increased by 10.30 kg/(mm·hm2)(2004)and 6.76 kg/(mm·hm2)(2005)compared with those of CK,respectively,and water storage was obviously increased during foxtail millet growth.Although the yields are different because of precipitation difference in 2004 and 2005,yield increase has the same tendency.On the average the yields of different treatments increased by 108.48% in 2004 and 135.28% in 2005 compared with those of CK.By regression analysis,the optimum width of ridge and furrow was about 45 cm. |