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| Effects of maize-soybean intercropping with different widths on photosynthetic characteristics of soybean and population yield |
| Received:March 27, 2020 |
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| KeyWord:wide intercropping;soybean;photosynthetic characteristics;yield |
| Author Name | Affiliation | E-mail | | WANG Ya-mei | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Quality of Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environmental and Agro-product Safety, Tianjin 300191, China | | | XU Yan-xiao | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | WANG Ya-lu | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Quality of Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environmental and Agro-product Safety, Tianjin 300191, China | | | LI Jing | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Quality of Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environmental and Agro-product Safety, Tianjin 300191, China | | | ZHANG Hai-fang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Quality of Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environmental and Agro-product Safety, Tianjin 300191, China | | | YANG Dian-lin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Quality of Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environmental and Agro-product Safety, Tianjin 300191, China | | | ZHAO Jian-ning | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Quality of Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environmental and Agro-product Safety, Tianjin 300191, China | zhaojn2008@163.com | | XUAN Qing-xia | Qihe Agricultural Bureau in Shandong Province, Shandong 251100, China | |
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| Abstract: |
| We conducted field experiments in 2018 and 2019 to explore the effects of maize-soybean intercropping, laid out at different widths based on the agricultural machinery used, on the photosynthetic characteristics of soybean and population yield. We measured the photosynthetic and physiological growth indices of soybean and population yield, under maize-soybean intercropping modes in a 2:1 (I21), 2:2 (I22), and 2:3 (I23)ratio, with fields of single maize (SM)and single soybean (SSB)as the controls. The results after two years showed that the diurnal variation in photosynthetic active radiation (PAR)above the canopy of the soybean showed a single-peak curve trend that increased first and then decreased. As the ratio of the soybean planting increased, the PAR above the canopy of intercropping soybean increased gradually, however, all their values were smaller than that of the monoculture. The net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr)and aboveground biomass of soybean decreased in the intercropping systems compared with the monoculture. All indices increased as the ratio of soybean planting increased, among the treatments, the values for I21 were significantly lower than those for I23 and SSB, and there was no significant difference between I22 and I23. The intercellular CO2 concentration (Ci), chlorophyll content and height of soybean plants increased in the intercropping systems compared with the monoculture. All the indices decreased with the increase in the ratio of soybean planting, with the values for I21 being significantly higher than those for I23 and SSB. The maize yield increased and soybean yield decreased, both significantly, in the intercropping systems-compared with the monocultures-based on total treatment area. The LER (land equivalent ratio)based on grain yield of the three intercropping treatments increased with the increase in the ratio of soybean planting. The maize-soybean planting ratios of 2:2 and 2:3 demonstrated the advantages of intercropped production. |
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