Authors: LI Zhi-xing ^{1, 2}, XU Di ^{1, 2}, LI Yi-nong ^{1, 2}, BAI Mei-jian ^{1, 2}
1. China Institute of Water Resources and Hydropower Research, Beijing 100048, China
2. National Center Efficient Irrigation Engineering and Technology Research, Beijing 100048, China

Abstract: Based on the coupled model of surface-subsurface flow and solute transport for border strip fertigation established by the authors, the combination modes of technical factors of border strip fertigation were simulated to analyze the effect of the factors on performance of border strip fertigation system and determine the optimal ranges of the factors. The results show that soil texture, injection strategy, inflow discharge, length of border strip as well as the micro-topography of border strip surface may obviously affect the performance of the fertigation system. In the whole process of the irrigation event, if the higher evaluation indicators of the border strip fertigation system were selected as the control conditions, the appropriate border strip length corresponding to the irrigation discharge 2 l/s/m and 5 l/s/m should be smaller than 70m and 100m for typical sandy loam texture soil under good micro-topography condition, while it should be smaller than 60m and 75m under bad micro-topography condition. The appropriate border strip length corresponding to the irrigation discharge 2 l/s/m and 5 l/s/m should be smaller than 80m and 110m for the border strip of typical clay texture soil under good micro-topography condition, while it should be 60m and 90 respectively under bad micro-topography condition.

Key words: border strip fertigation, technical factors, performance evaluation, optimal range, injection strategy, length of border strip

Published in: Journal of Hydraulic Engineering, Vol. 42, No. 3, 2011

Article ID: 0559-9350 (2011) 03-0271-07