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| Relationship between population competitive intensity and yield in maize cultivars |
| ZHAI Li-chao1, 2*, XIE Rui-zhi1*, LI Shao-kun1, FAN Pan-pan1 |
1 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture, Beijing 100081, P.R.China
2 Center for Agricultural Resources Research, Institute of Genetics and Development Biology, Chinese Academy of Sciences, Shijiazhuang 050021, P.R.China |
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Abstract Competition is a common phenomenon in agriculture production. Research on the relationship between competitive ability and crop yield is extensive, but the results have been inconsistent. Few studies have focused on the relationship between population competitive intensity and yield of maize (Zea mays L.) cultivars. The main objective of this study was to determine if a consistent relationship exists between maize yield and competitive ability. A two-year field experiment was conducted, employing a de Wit replacement series design. When two maize cultivars were grown in a mixture, yield was reduced for the modern cultivar and increased for the older cultivar. In each replacement series, per plant level yield of each cultivar, and population level yield of the mixture, decreased with increasing proportion of the older cultivar. Competitive ratio (CR) reflected differences in competitive ability of the three maize cultivars. In each replacement series, population competition pressure (PCP) increased with increasing proportion of the older cultivar, indicating that the older cultivar was a strong competitor. Biomass yield, grain yield, harvest index, thousand-kernel weight, and kernel number per plant, were negatively correlated with PCP. Our results demonstrated that inter-cultivar competition affects maize productivity, and increasing PCP will decrease translocation of assimilates to grain and, ultimately, reduce yield. Therefore, there is a negative correlation between population competitive intensity and yield performance in maize, breeders should develop a communal ideotype that would not perform well in competition in future.
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Received: 20 July 2016
Accepted:
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| Fund: We thank the National Basic Research Program of China (973 Program, 2015CB150401), the National Maize Industry Technology Research and Development Center, Ministry of Agriculture, China, and the Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences for their supports. |
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Corresponding Authors:
LI Shao-kun, Tel/Fax: +86-10-82108891, E-mail: lishaokun@caas.cn
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Cite this article:
ZHAI Li-chao, XIE Rui-zhi, LI Shao-kun, FAN Pan-pan.
2017.
Relationship between population competitive intensity and yield in maize cultivars. Journal of Integrative Agriculture, 16(06): 1312-1321.
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