Effects of site preparation and fertilizer application at planting on Eucalyptus tereticornis at Morogoro,Tanzania |
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| Affiliation: | 1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;2. USDA FS, Eastern Forest Environmental Threat Assessment Center, Research Triangle Park, NC 27709, USA;3. Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;4. University of the Chinese Academy of Sciences, Beijing 100049, China;1. Laboratoire des Sciences du Climat et de l’Environnement (LSCE/IPSL), UMR 8212 (CEA/CNRS/UVSQ), 91191 Gif-sur-Yvette Cedex, France;2. Plant Functional Biology & Climate Change Cluster, University of Technology, Sydney, P.O. Box 123, Broadway, NSW 2007, Australia;3. CESBIO, UMR 5126 (CNES-CNRS-UPS-IRD), 18 avenue Edouard Belin, 31401 Toulouse Cedex 9, France;4. Helmholtz Centre Potsdam, German Research Centre for Geosciences GFZ, Telegrafenberg 14473, Potsdam, Germany;5. Technische Universität (TU) Dresden, Institute of Hydrology and Meteorology, Chair of Meteorology, D-01062 Dresden, Germany;6. Department of Environmental Systems Science, Institute of Agricultural Sciences, ETH Zurich, 8092 Zurich, Switzerland;7. Alterra Wageningen University and Research, Wageningen, The Netherlands;8. UMR INRA-AgroParisTech, Environnement et Grandes Cultures, 78850 Thiverval-Grignon, France;9. Key State Laboratory of Land Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100871, China;10. College of Resource Science and Technology, Beijing Normal University, Beijing 100875, China;1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, Shaanxi, China;2. College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China;1. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China;2. School of Soil and Water Conservation, Beijing Forestry University, Beijing 100038, China;3. Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China;4. Institute of Geographic and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;5. University of Chinese Academy of Sciences, Beijing 100049, China;6. Center for Chinese Agricultural Policy, Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: | Uniform nursery stocks of Eucalyptus tereticornis were used to establish an experiment factorially combining site preparation (three levels—bedding; disking; neither bedding nor disking), initial nitrogen applications (two levels—75 g ammonium sulphate per plant; 0 g ammonium sulphate per plant) and initial phosphorus applications (150 g triple super phosphate per plant; 0 g triple super phosphate per plant).Monitoring was carried out for 2 years by which time trees were up to 3.2 m tall and 5.0 cm in diameter at the root collar. Survival at 2 years was significantly higher among plants that had received nitrogen (65%) than those which had not (53%) and among plants on disked or bedded sites (62%) than those on unworked soil (53%). Monthly height increment was briefly, but significantly, increased in plants supplied with additional nitrogen and further enhanced if there was also additional phosphorus. Monthly diameter increment was, over most of the 1st year, significantly greater on sites prepared by bedding; significant increases also resulted, though for more restricted periods, from site preparation by disking and from provision of additional nitrogen. At the end of 1 year significantly higher concentrations of foliar potassium, suggesting enhanced drought hardiness, were detected for plants on bedded or disked ground. The concentration in these was 1%; on unworked ground the corresponding value was 0.8%. Combining bedding or disking with an initial application of nitrogen offset this effect.The short period over which growth benefits from the site preparation and nitrogen application treatments is noted but it is stressed that initial growth encouragement is desirable with Eucalyptus and that overall benefits, as an improved survial, may be long term. The value of phosphorus applications under the prevailing conditions is considered unproven. |
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