Effect of plant population on seed yield,mass and size of guayule |
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| Authors: | GM Bedane ML Gupta DL George |
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| Institution: | 1. Bridgestone Americas, Inc., Agro Operations Guayule Research Farm, 4140 W. Harmon Rd., Eloy, AZ 85131, USA;2. The School of Plant Sciences, The University of Arizona, Tucson, AZ 85721, USA;3. Bridgestone Americas, Inc., BioRubber Process Research Center, 6533 S. Mountain Rd., Mesa, AZ 85212, USA;4. USDA-ARS National Laboratory for Genetic Resources Preservation, 1111 S. Mason St., Fort Collins, CO 80521, USA;1. Center for Global Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-0053, Japan;2. Graduate School of Engineering, Shizuoka University, 3-5-1 Johoku Naka-ku, Hamamatsu 432-8561, Japan;3. Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan;1. International Maize and Wheat Improvement Center – Bangladesh, House 10/B, Road 53, Gulshan-2, Dhaka 1213, Bangladesh;2. Melbourne School of Land and Environment, University of Melbourne. Victoria 3010, Australia;3. International Maize and Wheat Improvement Center – Nepal, P.O. Box 5186, Singha Durbar Plaza Marg Bhadrakali, Kathmandu, Nepal;1. Department of Agroecology, Aarhus University, AU-Foulum, DK-8830, Tjele, Denmark;2. Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, DK-6700, Esbjerg, Denmark;1. Department of Soil Science, University of Sao Paulo (ESALQ/USP), P.O. Box 9, Piracicaba 13418-900, SP, Brazil;2. Department of Soil Science (ESALQ/USP), Piracicaba 13418-900, SP, Brazil;3. Embrapa Instrumentation Center (CNPDIA/EMBRAPA), São Carlos 13560-970, SP, Brazil;1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, PR China;2. USDA, Agricultural Research Service, San Joaquin Valley Agricultural Science Center, 9611 South Riverbend Avenue, Parlier, CA 93648-9757, USA |
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| Abstract: | Guayule (Parthenium argentatum Gray) is a source of high quality low-allergenic natural rubber. It is a relatively new crop in Australia and optimum plant density for seed production has not been established. The objective of the current experiment was to examine whether seed yield, mass and size are affected by plant population. The effect of plant population on seed yield, mass and size was investigated by planting guayule (AZ-2) at 4444, 8300, 12,500 and 25,000 plants/ha. Data were collected at 16 and 28 months after planting. Seed was harvested manually multiple times over 4 weeks each year following the main flowering period in spring. Harvested seed was threshed and clean seed yield was compared among different plant populations. Seed quality attributes were also compared in terms of 1000-seed mass and seed size. Lowest plant population of 4444 plants/ha provided the highest yield at 28 months but was the lowest yielding at 16 months because the plants had not yet reached full size to compensate for the wider spacing. However, at both ages this treatment produced heavier and larger seeds. The difference in yield or seed mass and size between plant populations ranging from 8300 to 25,000 plants/ha was not significant. Overall results of the study demonstrated that seed yield and seed size, which is important in direct seeding could be affected by plant population. |
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