作物生体液(導管液, 葉柄汁液, 葉身汁液)の微量要素濃度

概要

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The direct analysis of leaf fluids provides real-time information on crops and helps to determine the need for quick action such as top-dressing. It is believed that the solute concentrations of fluids and saps are the principal indication to understanding the nutritional and physiological conditions of crops. Information on the concentrations of the major elements in the fluids has been accumulated gradually, but there is little information about the concentrations of minor elements in the fluids. We conducted several experiments to determine the concentrations of minor elements (mainly Mn, Zn and Fe) in the fluids of leaf petiole and leaf blade and the xylem saps of various crops, mainly cucumber (Cucumis sativus L.). In xylem saps, the concentrations of Mn, Zn and Fe were 0.12-2.4, 0.37-1.2 and 0.11-0.24 mg L^<-1>, respectively. In the fluids of leaf petiole, the concentrations of Mn, Zn and Fe were 0.5-26.2, 0.2-29.1 and 0.04-2.8 mg L^<-1>, respectively, and in the fluids of leaf blade, they were 0.7-32.0, 1.2-22.7 and 0.17-1.35 mg L^<-1>, respectively. The concentrations of Mn, Zn and Fe in the leaf fluids of cucumber decreased with the increased application of P. It is thought that the excessive application of P makes minor elements insoluble in the soil or in the root. Fluid and sap analyses were effective methods to diagnose the plant nutrition of both major and minor elements.
社団法人日本土壌肥料学会の論文
1997-10-05