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Journal of Integrative Agriculture  2019, Vol. 18 Issue (10): 2219-2229    DOI: 10.1016/S2095-3119(19)62616-X
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Maize/peanut intercropping increases photosynthetic characteristics, 13C-photosynthate distribution, and grain yield of summer maize
LI Yan-hong1, 2*, SHI De-yang1, 3*, LI Guang-hao1, ZHAO Bin1, ZHANG Ji-wang1, LIU Peng1, REN Bai-zhao1, DONG Shu-ting1  
1 State Key Laboratory of Crop Biology/College of Agronomy, Shandong Agricultural University, Tai’an 271018, P.R.China
2 Soil Fertilizer Station of Yantai Agricultural Technology Promotion Center, Yantai 264000, P.R.China
3 Institute of Maize and Oil Crops, Yantai Academy of Agricultural Sciences, Yantai 265500, P.R.China
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Intercropping is used widely by smallholder farmers in developing countries to increase land productivity and profitability.  We conducted a maize/peanut intercropping experiment in the 2015 and 2016 growing seasons in Shandong, China.  Treatments included sole maize (SM), sole peanut (SP), and an intercrop consisting of four rows of maize and six rows of peanut (IM and IP).  The results showed that the intercropping system had yield advantages based on the land equivalent ratio (LER) values of 1.15 and 1.16 in the two years, respectively.  Averaged over the two years, the yield of maize in the intercropping was increased by 61.05% compared to that in SM, while the pod yield of peanut was decreased by 31.80% compared to SP.  Maize was the superior competitor when intercropped with peanut, and its productivity dominated the yield of the intercropping system in our study.  The increased yield was due to a higher kernel number per ear (KNE).  Intercropping increased the light transmission ratio (LTR) of the ear layer in the maize canopy, the active photosynthetic duration (APD), and the harvest index (HI) compared to SM.  In addition, intercropping promoted the ratio of dry matter accumulation after silking and the distribution of 13C-photosynthates to grain compared to SM.  In conclusion, maize/peanut intercropping demonstrated the potential to improve the light condition of maize, achieving enhanced photosynthetic characteristics that improved female spike differentiation, reduced barrenness, and increased KNE.  Moreover, dry matter accumulation and 13C-photosynthates distribution to grain of intercropped maize were improved, and a higher grain yield was ultimately obtained.
Keywords:  maize        intercropping        peanut        land equivalent ratio (LER)        net photosynthetic rate (Pn)        13C-photosynthates distribution  
Received: 19 July 2018   Accepted: 29 September 2019
Fund: We acknowledge the financial support of the National Key Research and Development Program of China (2017YFD0301001), the National Natural Science Foundation of China (31301274 and 31171497), funds from the Shandong “Double Tops” Program, China (SYL2017XTTD14), and the Open Project of State Key Laboratory of Crop Biology in Shandong Agricultural University, China (2018KF10).
Corresponding Authors:  Correspondence DONG Shu-ting E-mail:   
About author:  * These authors contributed equally to this study.

Cite this article: 

LI Yan-hong, SHI De-yang, LI Guang-hao, ZHAO Bin, ZHANG Ji-wang, LIU Peng, REN Bai-zhao, DONG Shu-ting. 2019. Maize/peanut intercropping increases photosynthetic characteristics, 13C-photosynthate distribution, and grain yield of summer maize. Journal of Integrative Agriculture, 18(10): 2219-2229.

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