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Introduction to the Root Characteristics and Structure of Soybean

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The root system of soybean is a taproot system. It is divided into a main root and lateral roots, and both the main root and the lateral roots are densely covered with root hairs. The main part of the root lies 5-20 cm deep in the soil, and the whole root system is roughly bell-shaped. On soybean roots, rhizobia live in symbiosis with the soybean. When the soybean germinates, the rhizobia invade the root, and when the soybean grows its first compound leaf, root nodules have formed on the soybean roots, first on the main root and then gradually spreading to the lateral roots. The root nodules are produced through the action of rod-shaped rhizobia that have 1-2 flagella at one end. They are aerobic bacteria, mainly growing on the root system near the soil surface

The root system of soybean is a taproot system. It is divided into a main root and lateral roots, and both the main root and the lateral roots are densely covered with root hairs. The main part of the root lies 5-20 cm deep in the soil, and the whole root system is roughly bell-shaped.

On soybean roots, rhizobia live in symbiosis with the soybean. When the soybean germinates, the rhizobia invade the root, and when the soybean grows its first compound leaf, root nodules have formed on the soybean roots, first on the main root and then gradually spreading to the lateral roots. The root nodules are produced through the action of rod-shaped rhizobia that have 1-2 flagella at one end. They are aerobic bacteria, mainly growing on the root system within 20 cm of the soil surface. The root nodules are generally 4-5 mm in diameter, green when first formed, gradually turning light red, and finally becoming dark brown. The rhizobia fix free nitrogen from the air and, besides supplying their own nitrogen nutrition, provide the excess to the soybean for growth and development.

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