Abstract:In order to evaluate the fertigation mode of mango with high efficiency production in dry and hot region, a field mango experiment was carried out in dry and hot region of southwest by applying moistube fertigation technology. Four irrigation modes and three fertilization levels were set up with 7-year-old Guifei mango as experimental materials. Four irrigation modes were full irrigation (FI, 100% ETC) in all fruit developmental stages and regulated deficit irrigation (RDI) in three growth stages. The deficit adjusted stage were flowering stage, expanding stage, and mature stage (RDIFS, RDIES and RDIMS), and the irrigation level in deficit adjusted stage was 50% ETC, non-deficit adjusted stage was 100% ETC. Three fertilization levels were high fertilizer (FH), medium fertilizer (FM), and low fertilizer (FL). The effects of different water and fertilizer treatments on mango yield, water and fertilizer use efficiency, and photosynthetic characteristics were studied. The results showed that the Pn, Gs, and Tr of mango leaves were significantly reduced by water regulation deficit at different growth stages, while WUEi of mango leaves was significantly increased. At the same irrigation level, Pn, Gs and Tr increased with the increase of fertilizer application, WUEi increased first and then decreased with the increase of fertilizer application, and Pn, Tr and WUEi increased with the increase of fertilizer application at maturity. Compared with FI treatment, RDIFS significantly reduced the weight, yield, and PFP by 11.74%, 23.43% and 23.98%, RDIESdecreased by 21.09%, 20.29% and 20.50%, while RDIES and RDIMS increased IWUE by 11.87% and 32.81%, respectively. Compared with FM, FH significantly reduced yield and IWUE by 4.17% and 4.06%, and FL reduced by 6.75% and 6.67%, respectively. PFP decreased with the increase of fertilizer application. Compared with CK, except RDIMSFM treatment increased yield by 6.36% and RDIMSFL treatment did not increase significantly, the other treatments decreased by 3.14%~31.76%. Under RDIMSFL and RDIMSFM treatments, PFP and IWUE achieved maximum values of 363.93 kg/kg and 15.80 kg/m3, respectively, which increased significantly compared with CK. Therefore, considering yield and IWUE, RDIMSFM is the best moistube fertigation mode of mango in dry and hot region.