Soil physical limitations that affect directly crop root elongation are the water, heat and mechanical stresses. In the literature, there are few studies that present a clear relationship of root elongation rate and soil physical stresses that could be used into a root growth models. The aim of this study was to carry out a systematic review, compiling and analyzing the impacts of the physical limitations of the soil (water stress, heat stress and soil strength) on the root elongation rate of soybean. The PRISMA method was used to select scientific papers published in the Scopus and Web of Science databases. The terms "root elongation", "soybean", "Glycine max", "water stress", "mechanical impedance", "heat stress", "hypoxia", "soil penetration resistance", "matric potential" and "temperature" were used as selection criteria. These procedures resulted only in ten papers, which were published until June 2021. The results indicate that the soybean root elongation was increased due to the increase in soil temperature, until 30 °C. Soil penetration resistance reduce exponentially the root elongation, and 4 MPa was sufficient to slow root elongation to approximately 7% of its unimpeded rate. The root elongation decay exponentially due to the reduction of the water potential. Even though soil compaction, heat stress, and water potential are relevant factors that affect directly the soybean root elongation, very few studies have published comparisons of the root responses to soil physical condition for soybean.

直接影响作物根系伸长的土壤物理限制是水、热和机械应力。在文献中，很少有研究表明根伸长率和土壤物理应力之间的明确关系可用于根生长模型。本研究的目的是进行系统评价，汇编和分析土壤物理限制（水分胁迫、热胁迫和土壤强度）对大豆根系伸长率的影响。PRISMA 方法用于选择在 Scopus 和 Web of Science 数据库中发表的科学论文。术语“根伸长”、“大豆”、“甘氨酸最大值”、“水分胁迫”、“机械阻抗”、“热应力”、“缺氧”、“土壤渗透阻力”、“基质势”和“温度”作为选择标准。这些程序只产生了十篇论文，其中发表至 2021 年 6 月。结果表明，大豆根伸长率因土壤温度升高而增加，直至 30 °C。土壤渗透阻力成倍降低根伸长率，4 MPa 足以将根伸长率减慢至约 7 % 其畅通率。由于水势的降低，根伸长呈指数衰减。尽管土壤压实、热应激和水势是直接影响大豆根伸长的相关因素，很少有研究发表了大豆根系对土壤物理条件的反应的比较。