Simulation of full-film double-row furrow roller hole fertiliser application based on DEM-MBD coupling and research on its water and fertiliser transport law

To optimise the under-membrane fertiliser application of "one film for two years" technology, this paper established the model of T1 and T2 roller hole applicators and adopted discrete element method - multi-body dynamics (DEM-MBD) coupling technology to simulate the under-membrane fertiliser application process and to optimise water and fertiliser application using transport laws under the whole-membrane double-rowed furrow. The coupling results showed that when the roller hole applicator advances at 1 m s-1, the hole application volume of T1 and T2 models is 14.43 g and 15.02 g, respectively, the particle velocity of the membrane pore is 0.2-0.8 m s- 1 and 0.2-0.96 m s- 1, respectively, the resistance of the hole tying is 21.67 N and 21.41 N, respectively, and the soil disturbance velocity is respectively 1.54 m s- 1 and 1.31 m s- 1. The HYDRUS-2D/3D was used to simulate the under-membrane fertiliser application process. The results of HYDRUS-2D/3D showed that the water content of the soil in the furrow was 12.7-13.5%, the water absorption rate of the crop root system was 0.2 cm d-1, and the concentration value at the centre point of the fertiliser application in the furrow was 0.72-0.88 mg cm-3. The results of the study showed that the roller hole applicator meets the requirements of the "one-membrane-two-use" under-membrane fertiliser application of full-film dual-monopoly furrow. The results provide a theoretical basis for the optimisation and enhancement of water and fertiliser transport in full film two monopoly furrow.