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分析了典型土壤质量吸收系数的田间变异，研究应用射线法测定田间土壤水分时的误差。研究表明：在整个电磁射线范围内，土壤容重和化学组成的田间变异对各种射线法的影响相当大，射线法的田间应用潜力是有限的
The field variation of typical soil mass absorption coefficient was analyzed. The error of applying the ray method to determine the field soil moisture was studied. The results show that the field variations of bulk density and chemical composition of soil have a great influence on all kinds of radiation methods in the whole range of electromagnetic radiation. The field potential of radiation method is limited