Evaluation of the portable furrow infiltrometer
Abstract Twenty infiltrometer tests were conducted to compare infiltration rates estimated by the recirculating infiltrometer (RIF) and the newly developed portable infiltrometer (PIF). Two types of furrows commonly used in the western United States; small and steep, and large and less steep; were considered in high and low infiltration soils. Comparison of the PIF and RIF infiltration rate measurements indicated that PIF was most accurate in estimating steady infiltration rates. Use of the PIF for predicting infiltration rate functions was not recommended because of the need for collecting accurate measurements early during the infiltration process. Considering ease of installation, accuracy in measuring steady infiltration rates, and ability to collect data during irrigation, the PIF is a promising device for use in surface irrigation management.
Surface Irrigation: Theory and Practice
Surface irrigation :theory and practice , Surface irrigation :theory and practice , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Advance and Runoff-Surge Flow Furrow Irrigation
Furrow advance and runoff evaluations were conducted on a field having a silt loam soil using pulsed water applications. The irrigation method, defined as “surge flow,” was applied in two experiments, each covering 100 m furrow sections. The first experiment consisted of 13 combinations of on- and off-times, replicated five times. The second experiment included 10 combinations of cycle period and cycle ratio with two replications. The results indicate that surge flow treatments significantly accelerated furrow advance per unit of applied water and reduced the temporal and spatial variability among furrows in the field. It is theorized that furrow drainage between surges accelerates the formation of thin surface seals, thereby reducing intake rates.