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How to correctly distinguish corn grades
The corn standard is still graded according to the bulk density, but the grade is adjusted from grade 3 to grade 5, adding an extra grade. The equivalent bulk densities of 1 ~ 5 are ≥ 720g/L, ≥ 685g/L, ≥ 650g/L, ≥ 620g/L and ≥ 590g/L respectively, and the rest are

The maximum limit index of imperfect grains was changed from 5.0% to 1 ~ 5, which were ≤4%, ≤6%, ≤8%, ≤ 10% and ≤ 15% respectively, so that the standard could more objectively reflect the actual quality of different grades of commercial corn.

Corn analysis:

The safe water content of corn in Northeast China (which can ensure the safe storage of grain) is 14.0%, and the safe water content of corn in different regions is different. A simple way to measure moisture is to use a fast moisture analyzer, which is very fast, but there will be some errors. The more accurate method is to take the corn to the inspection room of the grain department, crush and weigh it with a pulverizer, bake it in a constant temperature oven for a specified time, and then cool it to room temperature and weigh it. The ratio of the weight difference to the weight before drying is the water content of corn.

In the past, most inspectors in the grain sector could determine the moisture content of corn through sensory perception, but in order to protect farmers' interests and fair trade, the state has basically banned inspectors from detecting the moisture content of corn through sensory perception. Generally, the moisture content of newly harvested corn in Northeast China is about 27%, and it is about 14% in the south of Central South Plain. However, the moisture content of newly harvested corn is related to the weather near maturity and the maturity of corn.