Spatial distribution of nutsedge (Cyperus spp. L.) seed bank in rice growth cycle using geostatistics |
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| Affiliation: | 1. Agronomy and Plant Breeding Department, Lorestan University, Khorramabad, Iran;2. Agronomy and Plant Breeding Department, Genetics and Agricultural Biotechnology Institute of Tabarestan, Sari Agricultural Sciences and Natural Resources University, Sari, Iran;1. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, Qinghai 810016, China;2. Key Laboratory of Adaptation and Evolution of Plateau Biota,Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai 810008, China;3. State Key Laboratory of Grassland Agro-ecosystems, School of Life Sciences, Lanzhou University, Lanzhou, Gansu 730000, China;4. Key Laboratory of Restoration Ecology for Cold Regions Laboratory in Qinghai, Xining, Qinghai 810008, China;1. Università degli Studi di Milano, DiSAA, Cassandra Lab, via Celoria 2, 20133 Milan, Italy;2. Università degli Studi di Milano, DEMM, Cassandra Lab, via Celoria 2, 20133 Milan, Italy;1. School of Dentistry, University of Catania, Catania, Italy;2. College of Dentistry, University of Illinois at Chicago, Chicago, Illinois;3. Department of Orthodontics, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois;1. Department of Biology, Faculty of Sciences, University of Isfahan, Isfahan 81746-73441, Iran;2. Department of Biology, Payame Noor University, 19395-4697 Tehran, Iran;3. Department of Ecological Science, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands |
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| Abstract: | A field experiment was conducted to investigate the spatial distribution of nutsedge (Cyperus spp L.) seed bank in rice growth cycle using geostatistics in 2010–11. The sampling from seed banks were performed prior to rice farm preparation and after rice harvest; also weeds density was determined in three different dates during the growing season. The results showed that the highest amount of weed population was belonging to nutsedge (Cyperus spp. L.) including Cyperus difformis, C. rotundus and C. esculentus species. Nugget/sill ratios for all variogram models ranged from 15.2 to 46.9%, indicated that there was strong and moderate spatial correlation as spherical and exponential variograms models between weed and seedling nutsedge at all stages of sampling. Visual assessments of the weed growth in these field indicated that the weed exist in patches, but mapping results showed that the size and morphology of these patches varied within field. In the present study, seed bank patchy pattern was roughly in accordance with seedling germination pattern. Generally the provided seed bank maps can be used not only as information database of seedling germination, but also for predicting of seed bank dynamics and weed management programs. |
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| Keywords: | Nutsedge Rice Seed bank Spatial distribution |
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