Study on the Accumulation and Distribution Characteristics of Mineral Nutrients in Citrus grandis'Tomentosa'
To understand the accumulation and distribution of mineral nutrients in Citrus grandis'Tomentosa',the biomass and nutrient content of the roots,stems,leaves,and fruits of C.grandis'Tomentosa'were investigated to explore the accumu-lation of mineral nutrients in different organs and the loss of nutrient elements caused by fruit picking.The results revealed that the average contents of large and medium-sized mineral elements that accumulated in the trees were in the order of nitro-gen(N)＞potassium(K)＞phosphorus(P)＞calcium(Ca)＞magnesium(Mg)and the contents of trace elements were in the order of iron(Fe)＞manganese(Mn)＞zinc(Zn)＞copper(Cu).When the fresh fruit of C.grandis'Tomentosa'was harvested at 30 kg.plant‒1,the nutrient components of the fruit were N(125.72 g),P(55.77 g),K(95.48 g),Ca(23.63 g),Mg(16.07 g),Fe(799.72 mg),Mn(640.91 mg),Cu(124.78 mg),Zn(157.86 mg).Therefore,appropriate amounts of nitrogen,potassium,and calcium fertilizers should be applied in time to supplement the nutrients removed by harvesting and pruning.
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