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Soybean development is a continuous process that begins when a seed germinates and is completed where a mature seed is ready for harvest. During its life, the soybean plant is exposed to many factors that may encourage or retard its development and productivity. Some factors are controlled by nature, such as wind, rain, hail, and frost. But farmers also influence soybean development and productivity by application of pesticides and fertilizers or by the timing and methods of planting, cultivation, and other cultural practices.
Iowa State University. Agricultural and Home Economics Experiment Station
Agriculture | Plant Sciences
Fehr, Walter R. and Caviness, Charles E., "Stages of soybean development" (1977). Special Report. 87.