Abstract:

The reason which leads to different measured values of available K in soil after different grinding method treatments was studied in order to provide a scientific basis for nutrients analysis in soil and formulated fertilization. 3 different grinding methods were used to deal with the soil samples, and they were hand rolling, 2800 r/min and 25000 r/min rolling treatments with grinder. Potassium in the soil was extracted with ammonium acetate solution, and its content was analyzed with atomic absorption spectrophotometer. The results of variance analysis showed that available potassium content in the soil after 25000 r/min rolling treatment was significant higher than that of other two treatments. Available potassium content in the soil after hand rolling treatment was higher than that of 2800 r/min rolling treatment, while the difference was not significant. Available potassium content in the soil of 25000 r/min rolling treatment was 8.45%-181.60% higher compared with hand rolling treatment, and 9.65%-238.72% higher compared with 2800 r/min treatment. Available potassium content in the soil of hand rolling treatment was 1.11%-27.15% higher compared with 2800 r/min treatment. The potassium values did not accelerate with the increase of the mill speed in certain speed range.