根层水分变化对加工番茄生长调控效应的研究-作物栽培学与耕作学专业论文.docxVIP

II II Abstract Objective: The change of soil moisture in processing tomato root system was studied in this research, which may give a further understanding of the regulating role of change of root zone soil moisture on tomato growth and yield. This research was conducted to make the physiological regulation mechanism of output and water use efficiency clear, and optimized irrigation system was provided for yield improvement and higher water use efficiency for processing tomato under mulching film drip irrigation in arid. Methods: This 2-year field study was carried out. Experimental treatment consisted of two irrigation modes: DI (surface drip irrigation) where the irrigation line was placed right underneath the plastic mulch and SDI (subsurface drip irrigation) where the irrigation line was placed 30cm below the bed. Surface drip irrigation DI1, DI2 and DI3 were used for soil moisture at place 0~60cm, with moisture content set at (80±5)%, (60±5)%, (40±5)% of field moisture capacity respectively. Subsurface drip irrigation SDI1, SDI2 and SDI3 were used for control of irrigation volume and irrigation time to make them the same as those of surface drip irrigation DI1, DI2 and DI3. Results: (1) In the relative water deficit treatment and each treatment root vertical distribution, root length density and root weight density of root 0~1mm in diameter of the processing tomato of were significantly increased through subsurface drip irrigation treatments, and growth of root system in 0~30cm depth mainly were affected in the early, and following in the 30cm in the late. The weight ratio of vertical distribution of root system of processing tomato in the 30~80cm soil depth under subsurface drip irrigation was significantly higher than under the surface drip irrigation on Red fruit date. On day 14 after flowering, no significant difference was found with the root length density in 0~30cm soil depth in surface drip irrigation and subsurface drip irrigation treatments, but on R