某些作物所摄取的钾,约有90%是通过扩散作用移向植物根表后而吸收的,因此测定土壤中K~+的扩散系数,对了解K~+向根运移的速率就具有实际意义。对扩散系数的测定国内常用的是同位素冰冻切片法和同位素针筒法,此二法需应用同位素,难于推 About 90% of the potassium in some crops is absorbed by the diffusion to the roots of plants. Therefore, the diffusion coefficient of K ~ + in soils is determined, and the rate of K ~ Practical significance. The determination of diffusion coefficient commonly used in the country is the isotope frozen section method and isotope syringe method, the two methods need to use isotopes, it is difficult to push