Photosynthetic physio-ecological characteristics of maize intercropping system

Intercropping, due to its efficient utilization of light, has been proven to be an effective cultivation method and widely practiced in maize production.The light use efficiency and yield of maize intercropping system are mainly influenced by intercropping patterns and planting densities.The density of 48, 000 plants·hm^-2 for maize and ratio of 2:3 or 2:4 for maize/soybean intercropping was the most economic benefit mode in the middle of Guizhou province.Maize/peanut intercropping as an important cultivation pattern expanded rapidly in the Huang-Huai-Hai Plain.Ratio of 2:10 for maize/peanut intercropping enhanced the efficient utilization of strong sunlight by maize and weak sunlight by peanut, thus leading to a larger amount of dry matter accumulation and more intercropping advantages.The maize variety selection played a key role in different maize intercropping systems.In Henan province, ratio of 2:4 for higher maize/lower maize intercropping formed wave canopy, enhanced light use efficiency and improved the highest photosynthetic rate.Maize/wheat intercropping was increasingly becoming popular in northwestern China because of its efficient use of the light resources.The alfalfa competitive ability was stronger in maize/alfalfa intercropping, with a higher alfalfa biomass than monoculture.Ratio of 4:6 for maize/alfalfa intercropping was the best combination in the agriculture-animal husbandry eco-zone of northeast China.