Abstract:

At present, the full amount of organic fertilizer digestion method steps of the recommended agricultural standard were as follows: weigh 0.5-1.0 g (accurate to 0.100 0 g), add 5 mL sulfuric acid and 1.5 mL hydrogen peroxide, left overnight, slowly heat until the sulfuric acid is smoking, then take it off, after a little cooling, add 15 drops of hydrogen peroxide and after heating for 10 minutes, remove and cool slightly, then add 5-10 drops of hydrogen peroxide and digest in stages until the solution turns colorless or pale yellow. This method takes about 2 days, which is a long time and low efficiency. How to shorten the digestion time and improve the detection efficiency under the premise of ensuring the accuracy of the results is the main content of this discussion. In addition, the detection process of total nitrogen in organic fertilizer can also be used to determine the total nitrogen content more quickly and accurately.

Key words: organic fertilizer, digestion, total nitrogen, total phosphorus, total potassium