Study on Combination of Subsurface Irrigation Technology for Optimal Yield of Maize Based on Orthogonal Experiment

【Objective】 Exploring the soil moisture status and yield effects of different crop subsurface drip irrigation can provide technical reference for the popularization and application of subsurface drip irrigation. 【Method】 Based on the principle of orthogonal experiment design, the experiment used infiltration irrigation corn yield as the test index to study the sensitivity of the sowing depth, depth of subsurface emitter, irrigation frequency and irrigation quota to maize yield under subsurface drip irrigation, and observe soil moisture status under different treatments. 【Result】 The results show that the soil moisture distribution is different between subsurface drip and drip irrigation under film. The soil moisture content in the surface layer of subsurface drip irrigation is low and that in the middle and lower layers increases gradually. The soil moisture content of drip irrigation tillage layer under film was higher, the middle layer decreased, and the lower layer increased. Considering the high-yield and water-saving factors, the maize yield of 4,200 m³/hm² irrigation quota reached 9,905.56 kg/hm². This scheme can save water and achieve high yield. The average yield of subsurface drip irrigation maize is 9,485.10 kg / hm², which is 12.7% higher than that under drip irrigation under film. 【Conclusion】 Analysis of orthogonal experiment shows that the most significant effect on the yield of subsurface drip irrigation corn is the sowing depth, followed by irrigation frequency and depth of subsurface emitter, and the least impact is irrigation quota. The sowing depth is 20cm, the depth of subsurface emitter is 30 cm, the irrigation quota is 600 m³/hm², and the irrigation frequency is 7 times, which is the optimal parameter combination for subsurface drip irrigation maize high yield.