The aim of this study was to evaluate the effect of different controlled water regimes on the morphophysiological indicators, phenophases, and ideal cutting time of forage cacti clones grown in a semiarid environment. From 2016 to 2018, in the semi-arid region of Brazil, the Miúda (MIU), Orelha de Elefante Mexicana (OEM) and IPA Sertânia (IPA) clones were submitted to three regimes (40%, 80% and 120% ETc, where ETc is crop evapotranspiration) and to rainfed conditions (0% ETc). Cladode area index and the dry matter yield (DM) were used for calculating the morphophysiological indices. The cladode emission aided in delimiting the phenophases and, based on the DM accumulation, defined the ideal time for cutting the crop. The OEM clone excelled in terms of dry matter accumulation with a maximum value of 0.0441 Mg ha⁻¹ °Cday⁻¹. The water regimes above 80% ETc rise the number of phenophases in MIU and IPA clones. Cultivating forage cactus under water regime up to 40% ETc for OEM (895 °Cday) and 80% ETc for MIU and IPA (737 °Cday and 708 °Cday, respectively) anticipates the harvest time. Thus, a controlled reduction in the amount of water no negatively impact the growth dynamics, phenology, or cutting time.

这项研究的目的是评估在半干旱环境中生长的饲用仙人掌无性系对不同形态的生理指标，物候期和理想切割时间的影响。从2016年到2018年，在巴西半干旱地区，Miúda（MIU），Orelha de Elefante Mexicana（OEM）和IPASertânia（IPA）克隆被提交给三种方案（ETc分别为40％，80％和120％，其中ETc是作物的蒸散量）和雨育条件（0％ETc）。克拉德面积指数和干物质产量（DM）用于计算形态生理指标。枝状发射有助于划定表相，并基于DM积累确定了割季的理想时间。OEM克隆在干物质积累方面表现出色，最大值为0.0441 Mg ha ^-1°Cday ^-1。ETc高于80％的水分状况会增加MIU和IPA克隆的表相数目。在摄食条件下，对于OEM（895°Cday）ETc达到40％ETc，对于MIU和IPA（分别为737°Cday和708°Cday）达到80％ETc的水生仙人掌预计可以达到收获时间。因此，水量的受控减少不会对生长动态，物候或切割时间产生负面影响。