Fertilizer for Soy Beans

Nitrogen Fixation

• Nitrogen gas makes up about 80 percent of the earth's atmosphere, but it is not usable until certain types of bacteria get into the act and transform inert nitrogen into useful nitrogen. This process takes place in nodules that form on the roots of soybean plants. A soybean plant's need for nitrogen is greatest while the pods are filling, according to the University of Nebraska's website.

Soil Tests

• Soil fertility varies from state to state, making soil tests an indispensable tool in determining the nutritional needs of soybeans. In some areas, soybeans may benefit from supplemental fertilization, while in others, they are able to obtain what they need from the soil.

Soil Acidity

• The soil's pH level is important in making nutrients present in the soil readily available to soybeans. A pH between 5.5 and 7.0 is ideal, as it facilitates the absorption of nitrogen and phosphorus, and also aids in the decomposition of organic matter.