Irrigation uniformity, application efficiency and seasonal irrigation uniformity of mobile drip irrigation (MDI) were compared to those of low elevation spray application (LESA) and low energy precision application (LEPA). A center pivot fitted with two sets of MDI (with dripper flow rates of 3.8 L/h and 7.6 L/h), LESA and LEPA was used in this study. Irrigation uniformity tests were conducted in accordance with the American Society of Agricultural Engineers’ standards. Application efficiency was computed as the ratio of depth of water retained in the root zone to that applied. Potential differences in season-long irrigation uniformity were evaluated by analysis of periodically acquired aerial vegetative index data. The coefficient of uniformity of the 3.8 L/h and 7.6 L/h MDI was 93.8% and 93.7%, respectively, and 95.1% for LEPA, and 83.8% for LESA. Application efficiencies for the 3.8 L/h and 7.6 L/h MDI, LEPA and LESA were 76.1, 96.8, 98.4 and 51.2%, respectively. There were no significant differences ( p value = 0.5749) in the amount of water stored in the soil profile between MDI, LESA and LEPA, 72 h after irrigation. For three irrigation capacities of 6.2, 3.1 and 1.6 mm/day, there were no significant differences in mean seasonal Advanced Difference Vegetative Index (ADVI) between MDI, LESA and LEPA, with p value = 0.987, 0.999 and 0.999, respectively. A similar observation was made for Normalized Difference Vegetative Index, with p value = 0.998, 0.999 and 0.999, for MDI, LESA and LEPA, respectively. Higher coefficient of uniformity and higher application efficiency for MDI and LEPA indicate that they were more efficient than LESA. These results show that MDI can adapt the high efficiency of traditional drip irrigation to center pivot systems.

中文翻译：

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移动式滴灌动态均匀度及施用效率评价

将移动式滴灌（MDI）的灌溉均匀度、施用效率和季节性灌溉均匀度与低海拔喷洒（LESA）和低能量精确施用（LEPA）的灌溉均匀度、施用效率和季节性灌溉均匀度进行了比较。本研究中使用了装有两组 MDI（滴头流速为 3.8 L/h 和 7.6 L/h）、LESA 和 LEPA 的中心枢轴。灌溉均匀度测试是根据美国农业工程师协会的标准进行的。施用效率计算为根区保留的水深度与施用的水深度的比率。通过分析定期获取的空中植被指数数据，评估了季节性灌溉均匀度的潜在差异。3.8 L/h 和 7.6 L/h MDI 的均匀系数分别为 93.8% 和 93.7%，LEPA 为 95.1%，83。LESA 为 8%。3.8 L/h 和 7.6 L/h MDI、LEPA 和 LESA 的应用效率分别为 76.1、96.8、98.4 和 51.2%。灌溉后 72 小时，MDI、LESA 和 LEPA 之间土壤剖面中储存的水量没有显着差异（p 值 = 0.5749）。对于 6.2、3.1 和 1.6 毫米/天的三种灌溉能力，MDI、LESA 和 LEPA 之间的平均季节性高级差异植被指数 (ADVI) 没有显着差异，p 值分别为 0.987、0.999 和 0.999。对归一化差异植物指数进行了类似的观察，对于 MDI、LESA 和 LEPA，p 值分别为 0.998、0.999 和 0.999。MDI 和 LEPA 更高的均匀系数和更高的应用效率表明它们比 LESA 更有效。