Wheat/maize or wheat/soybean strip intercropping: II. Recovery or compensation of maize and soybean after wheat harvesting |
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| Institution: | 1. Department of Plant Nutrition, China Agricultural University, Beijing 100094, PR China;2. Institute of Soils and Fertilizers, Gansu Academy of Agricultural Sciences, Lanzhou 730070, PR China;3. Soil Science and Plant Nutrition, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;1. Division of Agronomy, Department of Crop Sciences, University of Goettingen, Von-Siebold-Str. 8, 37075, Goettingen, Germany;2. Centre of Biodiversity and Sustainable Land Use (CBL), University of Goettingen, Buesgenweg 1, 37077, Goettingen, Germany;1. Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou 730070, China;2. College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China;3. College of Engineering, Gansu Agricultural University, Lanzhou 730070, China;4. Agriculture and Agri-Food Canada, Swift Current Research and Development Centre, Swift Current, SK, S9H 3X2, Canada;1. State Key Laboratory of Grassland Agroecosystems, School of Life Sciences, Lanzhou University, Lanzhou 730000, PR China;2. School of Ecology and Environmental Science, Yunnan University, Kunming 650500, PR China;3. Key Laboratory of Microbial Resources Exploitation and Application of Gansu Province, Institute of Biology, Gansu Academy of Sciences, Lanzhou 730000, PR China;4. French Associates Institute for Agriculture & Biotechnology of Drylands, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel;1. Department of Biosystems and Technology, Swedish University of Agricultural Sciences, P.O. Box 103, SE-23053 Alnarp, Sweden;2. Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario M1C 1A4, Canada;3. Direction of Research and Development, Agronomy and Biotechnology Unit, OCP Group BP 118, Jorf Lasfar El Jadida, Morocco;1. College of Agronomy, Sichuan Agricultural University, Chengdu, China;2. College of Environment, Sichuan Agricultural University, Chengdu, China;3. College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China;4. Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agricultural, Chengdu, China;1. Beijing Key Laboratory of Biodiversity and Organic Farming, Key Laboratory of Plant and Soil Interactions, Ministry of Education, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China;2. Department of Plant and Environmental Sciences, University of Copenhagen, DK-1871 Frederiksberg, Denmark;3. Davines Group-Rodale Institute European Regenerative Organic Center (EROC), Via Don Angelo Calzolari 55/a, 43126 Parma, Italy |
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| Abstract: | While early-maturing crops benefit from intercropping, late-maturing crops usually suffer growth penalties during the intercropping phase. It is possible, however, that recovery or compensation of the late-maturing crops occurs after the harvest of the early-maturing crops. Three field experiments were conducted at Baiyun in 1997 and at Jingtan in 1997 and 1998 to test the hypothesis in wheat/maize and wheat/soybean intercropping. The biomass and nutrient accumulation in intercropped soybean were significantly smaller than in sole soybean before wheat harvest but thereafter increased sharply at Jingtan site in 1997. The rates of dry matter accumulation in the intercropped maize (10.0–20.1 g/m2 per day) were significantly lower than those in the sole maize (17.1–34.8 g/m2 per day) during the early stage from 7 May to 3 August, while mostly intercropped with wheat. After 3 August, however, the rates of intercropped maize, increasing to 58.9–69.9 g/m2 per day, was significantly greater than in sole maize (22.7–51.8 g/m2 per day) at Baiyun site in 1997 and nutrient acquisition showed the same trends as growth. At Jingtan site in 1998, the disadvantage of the border row of intercropped maize resulted from interspecific competition diminished after wheat harvest and disappeared at maize maturity. It was concluded that there was indeed recovery of growth after wheat harvesting in wheat/maize and wheat/soybean intercropping. However, the recovery was limited under N0P0 treatment. The interspecific competition, facilitation and recovery are together contributed to yield advantage of intercropping. |
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