| Irrigation management is an important part of farmland management.Scientific irrigation management is of great significance to improve the utilization efficiency of farmland water resources and the sustainable development of agriculture.In order to explore the scientific and reasonable irrigation management of mature jujube trees by means evapotranspiration,the drip irrigation jujube garden in Wensu County,Aksu Prefecture,Xinjiang was taken as the research object,based on the investigation of the current situation of drip irrigation management,the actual evapotranspiration（ETC）of the jujube garden in Hongqipo,which is calculated by the farmland water balance in 2019,is taken as the standard.The evapotranspiration estimated by Penman-Monteith（PM）,Hargreaves-Samani（HS）and Priestley-Taylor（PT）models were compared.Based on the significant meteorological factors of PM,HS,PT andETC,the decision model of drip irrigation management was established..In 2020,the“drip irrigation management decision-making model”（C1）and“quota of irrigation system”（C2）of irrigation controlled trials.Through the analysis of the changes in evapotranspiration of jujube trees in different growth periods of each treatment,the physiological characteristics of jujube trees and their knots were analyzed.The effect of increasing water production verifies the rationality of the decision-making model and proposes a more scientific drip irrigation management system for jujube orchard was proposed.The main conclusions are as follows:（1）Through field research,the local drip irrigation jujube gardens mainly have the problems of resource-based water shortage and managed-type water shortage.Aiming at the managed water shortage,improving the level of irrigation management is an effective way to solve the problem,and the evapotranspiration can be used for scientific and reasonable drip irrigation management.（2）The significant meteorological factors of PM,HS and PT were analyzed by stepwise regression.The significant meteorological factors of PM were as follows:solar radiation,mean wind speed,mean temperature and mean relative humidity.Significant meteorological factors of HS were as follows:maximum temperature,minimum temperature,zenith radiation and mean temperature.The significant meteorological factors of PT are solar radiation,mean temperature and minimum temperature.The estimated evapotranspiration of PM,HS and PT was larger than that ofETC in jujube orchard.（3）According to the significant meteorological factors of PM,HS and PT andETC,the drip irrigation management decision model（ET’）was established through unitary linear regression,which improved the application accuracy of the model.Compared with C2 treatment,C1 treatment saved 8%water and increased 5%production,indicating that C1 treatment was superior to C2 treatment in terms of water saving and increased production.（4）If the meteorological data is sufficient,ET’HS should be used in the germination and flowering stage,ET’PM should be used in the young fruit stage and fruit development stage for the water management of jujube orchard;Otherwise,water management can be managed according toET’HS.The cultivation and management system of jujube orchard should be carried out in three unifications（unified irrigation time,unified fertilization standard and chemical control,unified pest control）. |
