Irrigation
experimental study of 6 years had been carried out for 30 varieties of interplantation crop combination patterns
in 15 sites and stations in
Shanxi province by using field plot test. The results demonstrated that there are evident water saving and production increase effects for crop interplantation combination, by which grain production and value output per cubic meter of water consumption can be reached 1.25 to 2.04 kg and 1.25 to 2.45 Yuan respectively that are 0.08 to 0.45 kg and 0.25 to 0.65 Yuan higher than conventional single plantation way. Mechanism of water saving is the different periods of water requirement for various crops and mutual adjustment of root layer soil moisture at adjacent stripes, which alleviates the drought in some extent; local irrigation of combining crops can greatly decrease invalid evaporation from land surface; full use of light, heat and water resources is realized through appropriate combination by using different seeding times and growing times for different crops; as well as the side line production increase effect of stripe plantation of crops is also one of the reasons.