Soil–plant nutrient balance of tea crops in the northern mountainous region,Vietnam |
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| Institution: | 2. Livestock and Forestry Research Station, Division of Agriculture, University of Arkansas, Batesville 72501;3. Cooperative Extension Service, Bourbon County, University of Kentucky, Paris 40361;4. Department of Agronomy, The Pennsylvania State University, University Park 16802;1. Institut des sciences de la forêt tempérée (ISFORT), Université du Québec en Outaouais (UQO), 58 rue Principale, Ripon, QC J0V 1V0, Canada;2. Institut de recherche en biologie végétale, 4101 rue Sherbrooke Est, Montréal, QC H1X 2B2, Canada;1. Research Center for Urban Forestry, Key Laboratory for Forest Silviculture and Conservation of Ministry of Education, Key Laboratory for Silviculture and Forest Ecosystem Research in Arid- and Semi-arid Region of State Forestry Administration, Beijing Forestry University, Beijing 100083, China;2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;3. Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;4. Institute of Ecology, Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China |
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| Abstract: | Unbalance of nutrients in soil–plant system is considered a cause of soil quality degradation in long-term tea cultivation in the northern mountainous region, Vietnam. The objective of this study was to measure the nutrient balance between plant removals, recycling, storage and addition in different tea age classes (10, 25 and 40 years old). Plant biomass and plant nutrient concentrations were measured for calculation of plant nutrient uptake. Nutrients accumulated in the plants and removed from harvest were considered as nutrient loss, while fertilizer was considered as nutrient inputs gain to soil. Plant nutrient concentrations such as N, P, K, S and Mg in the tea stands decreased in the order: young leaves (and buds) > mature leaves > branches > stems. Age of the tea plantations had no significant effect on tissue concentrations of N, Ca, or Mg. However, there were significant differences between tea age classes for K (in both the young and mature leaves) and for P and S (in the mature leaves). The results from the study also showed that fertilizer inputs meet the crop nutrient demands (nutrient loss from harvest). However, if some other nutrient pools (e.g. nutrient leaching, storage in the plants) are accounted for the total nutrient budget, these inputs of fertilizer may not be enough to balance total nutrient losses. |
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