Seasonal variation of leaf mineral nutrient concentrations in seedless wampee (Clausena lansium ‘Yunan Seedless’)

Key words: 
• botany /
• seedless wampee(Clausena lansium ‘Yunan Seedless’) /
• leaf /
• mineral nutrient /
• variation

Abstract: Seedless wampee (Clausena lansium ‘Yunan Seedless’) is a new and nutritious fruit tree,but lack in research of cultivation and management. This objective is to provide a basis for rational fertilization to improve fruit quality. The seasonal variation for mineral concentrations of nutrient elements in leaves during growth of seedless wampee were determined for different phenological phases,including autumn shoot growth,bud differentiation,flowering,fruiting,fruit growth,and harvest stages in three different orchards(Xincheng,Nongkesuo,and Nongwei) of locations fertilized with organic and combined fertilization. Results showed that the concentrations of N,P,and K decreased from autumn to the next fruiting,but recovered with fertilizer application. Ca and Mn concentrations increased from autumn shoot growth to fruit maturity. The concentration of Cu in Xincheng Orchard decreased to a minimum during maturity,but increased to a maximum the following autumn; in Nongkesuo Orchard Cu was maximum in the fruit growing stage,but decreased to a minimum the following autumn; and in Nongwei Orchard Cu was highest with bud differentiation and lowest in the fruit growing stage. The seasonal variation of Zn in Xincheng and Nongwei Orchards decreased to a minimum in the flowering stage and peaked at harvest(Xincheng) and the following autumn shoot growth(Nongwei),whereas in Nongkesuo Orchard Zn decreased in the fruiting stage and increased during the following autumn shoot growth. The Fe concentration in Xincheng Orchard decreased to a minimum in the flowering period and increased to a peak in the fruit development period; however,in Nongkesuo and Nongwei orchards Fe peaked in the autum shoot growth stage,decreased to a minimum the following autumn shoot growth(Nongkesuo) and flowering stage(Nongwei). Concentrations of B for the three orchards were lowest in the flowering stage,maximum during the harvest stage in Xincheng and Nongwei Orchards,and highest the following autumn shoot growth in Nongkesuo Orchard.