Phosphorus deficiency stress in soybean plants can affect how phosphorus is absorbed and distributed, impacting the plant's dry matter accumulation. The study found that when faced with phosphorus deficiency, soybean plants shift phosphorus from older leaves to newer growth areas like stems, roots, and pods. This helps the plant continue to grow despite the lack of phosphorus. The research also showed that soybean plants can use phosphorus more efficiently when there is a shortage in external supply. Additionally, phosphorus deficiency stress can lead to premature aging of mature plant parts during the podding and seed-filling stages.