Performance of arugula genotypes under irrigation depths on Brazilian Cerrado

ABSTRACT Due to the water balance in the Brazilian Cerrado, it is not necessary to cultivate arugula in a rainfed system. Together with the lack of research on with this crop, it is necessary to study the response of genotypes to irrigation in this biome. Thus, the objective of this study was to determine the optimal irrigation depth and to identify the best arugula genotypes. Three arugula genotypes were field-tested during two cycles under the effect of four irrigation depths based on crop evapotranspiration. The parameters evaluated were root depth, SPAD index, number of plants and leaves per plant, plant diameter, fresh shoot mass and water use efficiency. The arugula presented the same demand for irrigation in the two cycles, and the genotypes and/or irrigation depths affected the evaluated parameters. The results support that the Folha Larga variety should be preferred by Brazilian Cerrado producers and irrigated with 90% replacement of crop evapotranspiration.摘要 鉴于巴西塞拉多（Brazilian Cerrado）地区的水分平衡特征，无需依靠雨养系统种植芝麻菜（arugula）；加之当前针对该作物的相关研究较为匮乏，有必要探究该生物群系下不同基因型对灌溉的响应。据此，本研究旨在确定最优灌溉水深，并筛选出适宜的芝麻菜基因型。本研究以3个芝麻菜基因型为供试材料，在基于作物蒸散量设置的4种灌溉水深梯度下，开展了两季田间试验。测定指标包括根长、SPAD指数、单位面积植株数与单株叶片数、植株直径、地上部鲜质量及水分利用效率。试验结果显示，两季试验中芝麻菜的灌溉需水量一致，且基因型与灌溉水深均对各测定指标存在显著影响。研究结果表明，巴西塞拉多地区种植者应优先选用‘Folha Larga’品种，并采用相当于作物蒸散量90%的灌溉补水比例。