The bulk density of corn is an important index to measure the quality of corn. According to the definition, the bulk density of corn refers to the mass in the unit volume of corn kernels, and the unit in China is g/L. The bulk density of corn can truly reflect the integrity, uniformity, maturity and potential nutritional value of corn to some extent. Generally speaking, the higher the bulk density of the same variety of corn, the more nutrients it contains.
The grain type controlled by genotype is an important factor to determine the bulk density, and the bulk density of different grain types is significantly different. The bulk density of popcorn is higher than that of hard corn, and the bulk density of hard corn is generally higher than that of horsetooth corn.
This may be because the arrangement gap of round-exploded corn in the capacity drum is smaller than that of flat-exploded corn, and the seed coat of round-exploded corn is smooth, so the packing density of round-exploded corn is higher than that of flat-exploded corn. At the same time, it was found that the bulk density was positively correlated with the keratin rate, popcorn was basically keratinized, and the keratin rate of hard grain type was higher than that of horse tooth type.
This is also the reason why the bulk density of colloidal corn planted in Heilongjiang is generally higher than that of ordinary northeast corn in recent years. Corn endosperm accounts for more than 80% of the whole corn grain. If the endosperm is poorly developed and the grain plumpness is poor, the bulk density of corn grain will be reduced to some extent.
The genetic expression of maize grain bulk density is mainly affected by the genetic effect of triploid endosperm. This further shows that the genetic difference of maize endosperm may affect maize bulk density, that is, the influence of maize varieties on maize bulk density.