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Analysis of Main Factors Affecting Crop Bulk Density

  • Categories:NEWS
  • Author:Jason Wei
  • Origin:Sanli
  • Time of issue:2022-07-01
  • Views:666

(Summary description)Bulk density is a crucial index in the quality analysis of crops such as wheat and corn. The accurate measurement of bulk density can provide a basis for evaluating the quality of crops.

Analysis of Main Factors Affecting Crop Bulk Density

(Summary description)Bulk density is a crucial index in the quality analysis of crops such as wheat and corn. The accurate measurement of bulk density can provide a basis for evaluating the quality of crops.

  • Categories:NEWS
  • Author:Jason Wei
  • Origin:Sanli
  • Time of issue:2022-07-01
  • Views:666
Information

Analysis of Main Factors Affecting Crop Bulk Density

Bulk density is a crucial index in the quality analysis of crops such as wheat and corn. The accurate measurement of bulk density can provide a basis for evaluating the quality of crops. At the same time, the bulk density of crops is also the main factor affecting the productivity of seed processing equipment.

Bulk density is the weight of a material per unit volume. In agricultural crops, "g/L" is usually used as the unit of bulk density.

1.The effect of crop shape on Bulk Density

1.1 Different types of crops, due to their differences in shape, will have a bigger effect on the bulk density of crops.

Referring to the above picture, the volume of container 1 and container 2 are the same, because the shape of crop A is relatively regular, and the crops can be closely fitted; The shape of crop B, there are many gaps between crops and crops. As a result, the two crops can be loaded in different quantities in a container of the same volume, that is, the bulk density of the two crops is different, and the bulk density of crop A is bigger than that of crop B.

Conclusion:

For different crops, without considering the influence of other factors (such as single-grain density, moisture content, etc.), the more regular the shape of the crop, the smaller the gap between crops, the larger the bulk density in general, otherwise the bulk density is smaller.

 

1.2 The same kind of crops, different varieties, and different shapes will also affect the bulk density.

The above is said the difference in bulk density between different kinds of crops, so is the bulk density of the same crop the same? In fact, if the varieties are different, the grain shape is different, and the bulk density will also be different.

Taking rice seeds as an example, there are japonica rice and indica rice, these two kinds of rice have differences shape and size. Generally speaking, the bulk density of japonica rice is about 600g/L, while that of indica rice is about 560g/L. So there is a significant difference in bulk density between them.

Take corn as an example. Although different varieties have similar shapes, but there are obvious size differences between different varieties, and their bulk density will also be different.

 

1.3 The same kind of crops and the same variety in different planting areas will also have different bulk density.

The same kind of crop, and the same variety, is the bulk density the same? The answer is not necessarily the same.

The bulk density of the same variety of crops will be affected by many factors. For example, due to different planting areas, there will be different climatic conditions, different soil fertility, and different growth periods, which will affect the quality (thousand-grain weight) and external dimensions of crops, resulting in different bulk density.                                                                                                                                                                                                                                                                                                                                                                                   

2. The effect of impurity content on crop bulk density

Harvesting method is the most important factor affecting the impurity content of crops, followed by drying methods and other human factors will also affect the impurity content of crops.

After the crops are harvested, the impurities mainly include light impurities, large impurities, small impurities, imperfect grains, heavy impurities, metal impurities, heterochromatic impurities and so on. Among them, light impurities, larges impurities and small impurities usually accounted for the largest proportion.

Light impurities: Leaves, bran, shell, dust particles and other plastic products;

Large impurities: Roots, straws, shells and other impurities whose dimensions are significantly larger than those of crops;

Small impurities: Sand, soil, broken grains, bran, wild grass seeds and other impurities whose dimensions are significantly smaller than those of crops.

Imperfect grains: Immature grains, insect-eaten grains, diseased grains, budding grains, moldy grains, damaged grains, frost-damaged grains, and baked-injured grains, etc.

 

Light impurity, the roots, stems, leaves and imperfect grains of plants can reduce the bulk density. while gravel, metal blocks, glass blocks, sand and small grass seeds can increase the bulk density.

3. The effect of moisture content on crop bulk density

3.1 The amount of moisture can cause changes in the shape of the grain, which will affects the bulk density.

Generally speaking, moisture increases, the bulk density decreases, and vice versa. The main reason is that the water increases, the grains expand and the volume becomes larger, resulting in a decrease in the number of crop grains per unit volume. In addition, the density of water is less than that of the crop, so the bulk density decreases.

3.2 Moisture size does not cause change of grain shape, the bulk density how to change?

For some crops with shell, such as hemp seeds, sesame seeds, etc. Because its shell is relatively hard, absorbs less water, and is not easily deformed. The amount of water has little effect on the shape of the shell, and because there is a certain gap between the shell and the kernel, the water increases, and the volume of the kernel expands, reducing the gap between the kernel and the shell, which is equivalent to filling the shell space, but the volume of the entire particle is basically unchanged. Therefore, in this part of the crops with shell, the increase in moisture means that the bulk density will also increase.

4. Other factors on affect crop bulk density

Besides above-mentioned main factors that affect the bulk density of crops, there are many other factors. Such as: temperature, humidity, etc. All of them will cause changes in crop shape and density, which will have an impact on bulk density.

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