畦灌田面水流中尿素分布规律试验研究

he distribution of urea in water flow of border irrigation under spreading urea over the filed, which can improve water and fertilizer use efficiency and fertilization design scheme, was studied. Border irrigation experiments were conducted at the Water-saving Park of Hohai University under the Ministry of Water Resources. Three border strips, which have the same specification but different discharges, were selected for the irrigation events. The variety of urea concentration in surface border irrigation water was observed and the effect of discharges on the distribution of urea in water flow was analyzed. Results demonstrated that the effect of surface water movement on the spreading urea over the field was remarkable, and was an important element which affected the final distribution of urea in soil profile. However, the distribution of urea was also affected by water distribution. As a result, the proper per unit width discharge is one of the most key measures on urea uniform distribution and efficient utilization.