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A N-tracer method was used to study the absorption of nitrogen applied in the spring to Satsuma mandarin trees and Rat’stail fescue, Vulpia myuros, in a mandarin orange orchard covered with Rat’s-tail fescue. The amount of nitrogen applied in the spring that was absorbed by mandarin orange trees in a plot covered with Rat’s-tail fescue was markedly smaller, about 47%, than that in a clean cultivated plot; the difference was particularly large in new leaves. The amount of nitrogen absorbed by Rat’s-tail fescue in a sod culture plot was about twice as large as that absorbed by the trees in the plot. Trees in the clean cultivated plot showed higher rates of N occupied by supplied nitrogen in all organs than trees in the sod culture plot did; the difference was particularly large in newly developed organs. However, Rat’s-tail fescue in the sod culture plot showed a markedly higher rate of N occupied by supplied nitrogen than the trees showed. A comparison of the utilization rates of nitrogen applied in the spring to trees in two different plots demonstrated that the rate was 16.7% in the sod culture plot and 35.3% in the clean cultivated plot; the rate was markedly higher in the clean cultivated plot. However, the utilization rate including an absorbed amount by Rat’s-tail fescue was 51.6% in the sod culture plot, which was about 1.5 times as high as that in the clean cultivated plot.

Absorption of Spring Applied Nitrogen in Satsuma Mandarin Orchard Covered with Rat’s-tail Fescue, Vulpia myuros