The Effect of Intermittent Constant Water Application on Soil Infiltration

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In this research ,20 laboratory experiments was carried out on a column of soil with dimensions (30 cm *30 cm *45 cm) on two types of soil loamy sand and loamy ,in order to study the infiltration characteristics of the soil under sprinkling application with constant application rate under continuous and intermittent application at three constant application rates (31,52.4 and68)mm/hr ,with four cycle ratios(cr=1,1/2,1/3,1/4) for loamy sand soil and application rate (31,52.4)mm/hr and three cycle ratios(cr=1,1/2,1/3) for loamy soil for each application rate , the study focused on two basic factor : the time to ponding ( )and the infiltration characteristics after ponding time .the study showed that using intermittent application method improves infiltration characteristics as it leads to increase in time to ponding ,this increased ranged between (3.22% to 155%)for loamy sand soil and (13.77% to 239.67%) for loamy soil at circle ratio equal as compared with continuous application in addition to increasing the accumulative infiltration rate depth at any time for example at 180min actual application time the accumulated infiltration depth increased by (3.26% to 47%)for loamy sand soil and (10.24% to 26.94%) for loamy soil using intermittent application (cr = ) as compared with continuous application.