How to determine the crude fiber content in soybean straw

The utilization rate of soybean straw is low due to its high crude fiber content and low crude protein content. One of the agronomic measures to improve the quality of crop straw feeding is to inhibit the reproductive growth of the plant. The coarse fiber tester was used to determine the change of crude fiber content in soybeans under different degrees of inhibition. After treatment, the coarse fiber content of straw was basically lower than that of the control, and the crude protein content was basically higher than that of the control, which increased the level of soybean straw to some extent. Feeding quality.

The annual output of soybean straw in China is about 30 million, and its utilization rate of feed is only 20.7%. Soybean grain can not be directly used in animal feed, but after a certain degree of treatment, the crude fiber content in soybean straw is below a certain value, and when the protein content is within a certain range, soybean straw can be used as animal feed. Crude fiber refers to organic substances that cannot be dissolved by dilute acid and dilute alkali and cannot be digested by humans or livestock. The main components are cellulose, residual hemicellulose and lignin. The crude fiber content of feedstuffs is generally determined by the National Standard for the Determination of Feed Crude Fiber (GB/T 6434-94), hereinafter referred to as the national standard method. The principle of the determination is to decontaminate the sample with acids and alkalis determined by the concentration under specific conditions, and then remove with ethanol. Dissolved matter, the amount of minerals deducted after high-temperature ignition, the balance of crude fiber. The fiber meter is designed using the above principles to determine the content of crude fiber in various foods, feeds, grains, foods, and other agricultural and sideline products. It can also measure the content of six samples at one time, which greatly improves the measurement efficiency.

The experimental results show that the sample smashing fineness is too large, the surface area contacted with the solution during leaching and washing is small, the smashing fineness is too small, and when the lotion is slightly boiling, some samples float on the liquid surface and thus easily adhere to the container wall. Can not fully leaching and washing; Weighing sample is too large, the sample is too heavy, leaching and washing part of the sample deposited at the bottom, the washing liquid can not be fully tumbling up and down when boiling, affecting the washing results in high results; Soybean straw composition Due to the complexity and high degree of lignification, it is necessary to extend the acid-alkali heat extraction time to make the components other than the crude fiber in the straw fully boiled. In the experiment, we need to work hard to do each step. Only in this way, the measured results can better meet the measurement needs and improve the measurement accuracy.

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