A field experiment was conducted to study the effects of different seed sowing density of corns and intercropping with peas on yield, by using double-ridge mulching with film with ridge width of 40 cm and 70 cm, respectively, in which corn plants were sown along the rows with spacing 40, 50 and 60 cm, respectively, and one or two individual plants of peas were inserted between corn plants equidistantly.
The result shows that the yield increased with the spacing of corn decreased when the number of peas was fixed, the total grain yield in within-rows-intercropping of spacing was 40 cm and 50 cm and grain yield of corn in monoculture was significantly greater than 60 cm; the total ground biomass in corn monoculture and intercropping in which inserted two peas between two corns when spacing is 40 cm was significantly greater than 60 cm, total aboveground biomass of intercropping in which inserted one peas between two corns when spacing was 40 cm was significantly larger than 50 cm and 60 cm; Corn aboveground biomass in monoculture which spacing was 40 cm was significantly greater than 60 cm. When corn spacing was fixed within-rows-intercropping had big effect on grain yield, it increased with the number of peas increased, but had little effect on total aboveground biomass and had no effect on corn yield. The total grain yield in intercropping of inserting two peas between two corns when spacing was 40 cm and 50 cm, which was significantly greater than the intercropping of inserting one pea between two corns.
Total aboveground biomass in intercropping of inserting two peas between two corns when spacing was 50 cm was significantly greater than the intercropping of inserting one pea between two corns in the same spacing.
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