Temperature-mediated developmental delay may limit yield of cotton in relay intercrops with wheat |
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| Authors: | L Zhang W van der Werf S Zhang B Li JHJ Spiertz |
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| Institution: | 1. College of Agricultural Resources and Environmental Sciences, Key Laboratory of Plant and Soil Interaction, Ministry of Agriculture, China Agricultural University, Beijing 100094, PR China;2. Wageningen University, Plant Sciences, Crop and Weed Ecology Group, P.O. Box 430, 6700 AK Wageningen, The Netherlands;3. Cotton Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Cotton Genetic Improvement, Ministry of Agriculture, Anyang, Henan 455004, PR China |
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| Abstract: | In the Yellow River valley of China, more then 1.4 million ha of cotton are grown as relay intercrops with wheat. Cotton is sown in April when winter wheat is already in the reproductive phase; thus, a wheat crop with a fully developed canopy will compete for resources with cotton plants in the seedling stage. Yields of cotton are lower in relay intercropping systems than in a monocrop, but the aggregate yield of the cotton–wheat system is greater than of monocultures of the component crops. We study the hypothesis that the lower yield of intercropped cotton is a consequence of delayed development and fruit formation of the cotton as a result of a lowered temperature experienced by seedlings in the intercrop, compared to monoculture, due to shading by wheat. |
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| Keywords: | Air temperature Soil temperature Soil cover Thermal time Physiological time Phenology |
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