The invention discloses a testing method of a
soil organic matter, and belongs to the technical field of a
soil component testing method. The method includes steps of under the condition of heating by an
oil bath spot, oxidizing soil organic carbon by excessive
potassium dichromate-
sulfuric acid solution, and performing
titration on the rest
potassium dichromate by
ferrous sulfate standard solution; calculating organic carbon amount of the consumed
potassium dichromate amount according to an oxidization correction coefficient, and then multiplying by a constant 1.724, namely, content of the
soil organic matter. The testing method is characterized in that the
oil bath spot is a heat-collecting type constant temperature magnetic stirring reaction
oil bath spot; when the temperature of the oil bath spot is risen to 185 DEG C, the power source is immediately
cut off, the heating of the oil bath spot is stopped; the whole heating process can be completed by means of afterheat of the oil bath. Fluid in a
test tube cannot spray, so that the parallelism of testing data is very good, the testing result is more exact; moreover, the whole testing process is safe, easy, energy-saving, high-efficient, and worthy of popularizing.