Effects of the fertirrigation with urban wastewater on coffee yield

Abstract This study aimed to evaluate the effects of fertirrigation on the yield of Arabic coffee (Coffea Arabica), using a drip irrigation system with untreated urban wastewater (UW); confronted with irrigation with fresh water (FW) with fertilizers; The study was carried out at Experimental Unit of Wastewater Treatment and Irrigated Agriculture, of UFV, during 18 months. The fertirrigated treatments (MR’s) consisted of five depths of UW (406, 515, 798, 924 e 1071 mm). FW with fertilization (MC) was used in another treatment; and a check plot, without irrigation and fertilization (T0). The yields in 1st and 2nd years and the biannual average (BA) were evaluated, using the Duncan Test. The results showed that there was no difference among MR’s; the average yield (AY) for the MR was higher than T0 in the 1st year; the AY for MR was higher than T0 and lower than MC, in the 2nd year; there was no difference between the AY for MR and MC which were higher than T0, in terms of BA.

摘要 本研究旨在评估水肥灌施（fertirrigation）对阿拉伯咖啡（Coffea Arabica）产量的影响，采用搭载未经处理城市污水（untreated urban wastewater, UW）的滴灌系统，并与施加肥料的淡水（fresh water, FW）灌溉方案开展对照试验。试验于维索萨联邦大学（UFV）污水治理与灌溉农业实验站进行，试验周期共计18个月。
水肥灌施处理组（MR组）设置5组未经处理城市污水灌水量梯度，分别为406、515、798、924及1071 mm；另一处理组采用施加肥料的淡水灌溉（MC组）；另设空白对照组（T0），不进行灌溉与施肥。
本研究采用邓肯多重比较检验（Duncan Test），对试验第1年、第2年的咖啡产量及两年度平均产量（biannual average, BA）进行评估。结果显示：各MR组间产量无显著差异；第1年时，MR组平均产量（average yield, AY）显著高于T0组；第2年时，MR组平均产量高于T0组但低于MC组；就两年度平均产量而言，MR组与MC组的平均产量无显著差异，且二者均显著高于T0组。