应用苏联丘林教授测土壤中水解性氮方法,多年来,一直认为是个经典方法。 按丘林法,称20克土样,用0.5N冷H_2SO_4浸提,加锌铁粉(9:1)0.5克还原硝态氮,并在浓H_2SO_4及K_2Cr_2O_7的作用下,转化为铵盐,加碱蒸馏,计算其含氮量。丘林是以淋溶黑钙土、草甸土、灰化土类为研究对 Professor Chu Lin of the Soviet Union to test soil hydrolyzable nitrogen method, over the years, has been considered a classic method. According to the Chouling method, soil samples of 20 g were weighed, extracted with 0.5N cold H 2 SO 4, and reduced with 0.5 g of zinc and iron powder (9: 1) to reduce nitrate nitrogen. Under the action of concentrated H 2 SO 4 and K 2 Cr 2 O 7, Add alkali distillation, calculate its nitrogen content. Qiu Lin is the leaching of chernozem, meadow soil, ash soil for the study